Intermetallics最新文献_第8页

Effect of elevated temperature and stress state on ductile fracture behaviors in titanium alloy: Experiments and modeling

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-20 DOI: 10.1016/j.intermet.2025.108708

Rui Feng, Minghe Chen, Lansheng Xie, Hongrui Dong

This research aims to characterize the effects of elevated temperature and stress state on the yield and fracture behavior of forged TC4 alloy. The uniaxial tensile, compression, and shear experiments were performed with different geometry under wide stress triaxiality at 760–800 °C. The experimental results indicate that the strength of TC4 titanium alloy decreases monotonously and unevenly with the temperature increase. The tension-compression asymmetry changes nonlinearly with temperature and strain, and this asymmetry decreases with increasing temperature. With the increase of stress triaxiality, the dimples in the fracture morphology become larger and deeper, and the ductile fracture mechanism changes from shear fracture to dimple fracture mechanism. A modified-JC constitutive model was proposed, and the coefficient of determination are about 0.981 and 0.971 for UTS and UCS. The temperature related yield function of Cazacu-Barlat2004 was constructed to describe the non-uniform evolution characteristics related to temperature and strain, and the fracture-related variables were calibrated with the hybrid experimental and numerical method under acceptable prediction accuracy. Finally, the temperature-related variables were successfully introduced into the DF2016 fracture model, and the fracture occurrence under different temperature and stress states were predicted with small prediction error. These research results can provide a basis for the shape and performance control of titanium alloy in the hot forming process.

{"title":"Effect of elevated temperature and stress state on ductile fracture behaviors in titanium alloy: Experiments and modeling","authors":"Rui Feng, Minghe Chen, Lansheng Xie, Hongrui Dong","doi":"10.1016/j.intermet.2025.108708","DOIUrl":"10.1016/j.intermet.2025.108708","url":null,"abstract":"<div><div>This research aims to characterize the effects of elevated temperature and stress state on the yield and fracture behavior of forged TC4 alloy. The uniaxial tensile, compression, and shear experiments were performed with different geometry under wide stress triaxiality at 760–800 °C. The experimental results indicate that the strength of TC4 titanium alloy decreases monotonously and unevenly with the temperature increase. The tension-compression asymmetry changes nonlinearly with temperature and strain, and this asymmetry decreases with increasing temperature. With the increase of stress triaxiality, the dimples in the fracture morphology become larger and deeper, and the ductile fracture mechanism changes from shear fracture to dimple fracture mechanism. A modified-JC constitutive model was proposed, and the coefficient of determination are about 0.981 and 0.971 for UTS and UCS. The temperature related yield function of Cazacu-Barlat2004 was constructed to describe the non-uniform evolution characteristics related to temperature and strain, and the fracture-related variables were calibrated with the hybrid experimental and numerical method under acceptable prediction accuracy. Finally, the temperature-related variables were successfully introduced into the DF2016 fracture model, and the fracture occurrence under different temperature and stress states were predicted with small prediction error. These research results can provide a basis for the shape and performance control of titanium alloy in the hot forming process.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108708"},"PeriodicalIF":4.3,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Selective laser melting of near Ti-5321 β titanium alloy: Microstructure, mechanical properties and deformation mechanism

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-17 DOI: 10.1016/j.intermet.2025.108688

Changfu Li , Wenlong Lu , Dezhi Wang , Yuhang Ren , Chao Wang , Guang Yang

In this work, the microstructure of near β Ti-5321 (Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe) alloy was optimized by varying the parameters of the selective laser melting (SLM) process. The room-temperature tensile properties of the samples were tested, and the deformation mechanism was analyzed. Fully dense sample preparation was achieved by changing the laser power and scanning speed parameters of SLM. The results of electron backscatter diffraction (EBSD) analysis showed that as-depositedsample containe columnar β grains with <001>//BD texture, and the width of the grains increased with the increase of laser power. The total elongation of the Ti-5321 alloy sample reaches 17 % and the ultimate tensile strength is 1126 MPa at room temperature tensile; the presence of α″ phase and {332}< 113> and {112}< 111> deformation twins in the microstructure of the sample near the tensile fracture suggests that the sample contains multiple deformation mechanisms, i.e, dislocation slip, transformation-induced plasticity (TRIP), and twinning-induced plasticity (TWIP).

{"title":"Selective laser melting of near Ti-5321 β titanium alloy: Microstructure, mechanical properties and deformation mechanism","authors":"Changfu Li , Wenlong Lu , Dezhi Wang , Yuhang Ren , Chao Wang , Guang Yang","doi":"10.1016/j.intermet.2025.108688","DOIUrl":"10.1016/j.intermet.2025.108688","url":null,"abstract":"<div><div>In this work, the microstructure of near β Ti-5321 (Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe) alloy was optimized by varying the parameters of the selective laser melting (SLM) process. The room-temperature tensile properties of the samples were tested, and the deformation mechanism was analyzed. Fully dense sample preparation was achieved by changing the laser power and scanning speed parameters of SLM. The results of electron backscatter diffraction (EBSD) analysis showed that as-depositedsample containe columnar β grains with <001>//BD texture, and the width of the grains increased with the increase of laser power. The total elongation of the Ti-5321 alloy sample reaches 17 % and the ultimate tensile strength is 1126 MPa at room temperature tensile; the presence of α″ phase and {332}< 113> and {112}< 111> deformation twins in the microstructure of the sample near the tensile fracture suggests that the sample contains multiple deformation mechanisms, i.e, dislocation slip, transformation-induced plasticity (TRIP), and twinning-induced plasticity (TWIP).</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108688"},"PeriodicalIF":4.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ study of FeCoCrMoCBTm high entropy bulk metallic glasses with high thermal stability via high-energy synchrotron X-ray diffraction

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-17 DOI: 10.1016/j.intermet.2025.108706

Wei Chen , Zhichao Lu , Chengzhe Wang , Xiaolong Li , Ming Yang , Guanhaojie Zheng , Yibo Zhang , Xuerui Wei , Yan Huang , Fan Zhang , Fanqiang Meng , Zhou Zhou , Dong Ma

Fe-based bulk metallic glasses (BMGs) exhibit good potential application in magnetic-electrical parts and anti-corrosion scenarios due to the good soft magnetic and mechanical properties. Despite their good properties, Fe-based BMGs generally suffer from the crystallization from a metastable glass state via structural relaxation, nucleation, and grain growth upon heating. Thus, pursuing high thermal stability is essentially the holy grail of the BMG research community. In this work, we successfully developed a series of FeCoCrMoCBTm high entropy BMGs (HE-BMGs) with superior thermal stability via microalloying and entropy tuning. Among these developed alloys, the Fe₃₃Co₁₅Cr₁₇Mo₁₃C₁₅B₆Tm₂ HE-BMG exhibits the best thermal stability with crystallization temperature exceeding 900 K (916 K) and activation energy of 510.3 ± 30 kJ/mol, which is higher than most of the conventional metallic glasses (MGs). The in-situ high energy synchrotron X-ray diffraction of Fe₃₃Co₁₅Cr₁₇Mo₁₃C₁₅B₆Tm₂ HE-BMG upon heating was carried out to further clarify the phase transformation mechanism and its correlation to thermal stability. This study offers some important insights into the crystallization path and thermal stability of HE-BMGs.

{"title":"In-situ study of FeCoCrMoCBTm high entropy bulk metallic glasses with high thermal stability via high-energy synchrotron X-ray diffraction","authors":"Wei Chen , Zhichao Lu , Chengzhe Wang , Xiaolong Li , Ming Yang , Guanhaojie Zheng , Yibo Zhang , Xuerui Wei , Yan Huang , Fan Zhang , Fanqiang Meng , Zhou Zhou , Dong Ma","doi":"10.1016/j.intermet.2025.108706","DOIUrl":"10.1016/j.intermet.2025.108706","url":null,"abstract":"<div><div>Fe-based bulk metallic glasses (BMGs) exhibit good potential application in magnetic-electrical parts and anti-corrosion scenarios due to the good soft magnetic and mechanical properties. Despite their good properties, Fe-based BMGs generally suffer from the crystallization from a metastable glass state via structural relaxation, nucleation, and grain growth upon heating. Thus, pursuing high thermal stability is essentially the holy grail of the BMG research community. In this work, we successfully developed a series of FeCoCrMoCBTm high entropy BMGs (HE-BMGs) with superior thermal stability via microalloying and entropy tuning. Among these developed alloys, the Fe33Co15Cr17Mo13C15B6Tm2 HE-BMG exhibits the best thermal stability with crystallization temperature exceeding 900 K (916 K) and activation energy of 510.3 ± 30 kJ/mol, which is higher than most of the conventional metallic glasses (MGs). The in-situ high energy synchrotron X-ray diffraction of Fe33Co15Cr17Mo13C15B6Tm2 HE-BMG upon heating was carried out to further clarify the phase transformation mechanism and its correlation to thermal stability. This study offers some important insights into the crystallization path and thermal stability of HE-BMGs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108706"},"PeriodicalIF":4.3,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced fracture properties by heterogeneous grain structures and dual nanoprecipitates

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-16 DOI: 10.1016/j.intermet.2025.108707

Jian Wang , Shengde Zhang , Wei Wang , Xiaolei Wu , Fuping Yuan

Excellent synergy of yield strength and fracture toughness has been achieved in a lightweight steel by deploying heterogeneous structures and dual nanoprecipitates. Two microstructures with similar yield strength (about 1.1 GPa) have been fabricated, one is the fully recrystallized heterogeneous grain structure with higher volume fraction of nanoprecipitates (HGS1), and the other one is the heterogeneous lamella structure consisting of both un-recrystallized and recrystallized areas with lower volume fraction of nanoprecipitates (HLS). The HGS1 shows higher uniform elongation and higher fracture toughness compared to the HLS. The HGS1 displays larger size of plastic zone and higher hardening capacity around the crack tip compared to the HLS. The plastic deformation around the crack tip is accommodated by the planar dislocation slips and the formation of parallel slip bands on two {111} planes for both samples. The average interspacing of the slip bands for the HGS1 sample is found to be smaller than that for the HLS sample, indicating a stronger hardening around the crack tip for the HGS1 sample. The higher fracture toughness of the HGS1 sample can be attributed to the stronger hardening around the crack tip by the smaller spacing of planar slip bands and the stronger precipitation hardening.

{"title":"Enhanced fracture properties by heterogeneous grain structures and dual nanoprecipitates","authors":"Jian Wang , Shengde Zhang , Wei Wang , Xiaolei Wu , Fuping Yuan","doi":"10.1016/j.intermet.2025.108707","DOIUrl":"10.1016/j.intermet.2025.108707","url":null,"abstract":"<div><div>Excellent synergy of yield strength and fracture toughness has been achieved in a lightweight steel by deploying heterogeneous structures and dual nanoprecipitates. Two microstructures with similar yield strength (about 1.1 GPa) have been fabricated, one is the fully recrystallized heterogeneous grain structure with higher volume fraction of nanoprecipitates (HGS1), and the other one is the heterogeneous lamella structure consisting of both un-recrystallized and recrystallized areas with lower volume fraction of nanoprecipitates (HLS). The HGS1 shows higher uniform elongation and higher fracture toughness compared to the HLS. The HGS1 displays larger size of plastic zone and higher hardening capacity around the crack tip compared to the HLS. The plastic deformation around the crack tip is accommodated by the planar dislocation slips and the formation of parallel slip bands on two {111} planes for both samples. The average interspacing of the slip bands for the HGS1 sample is found to be smaller than that for the HLS sample, indicating a stronger hardening around the crack tip for the HGS1 sample. The higher fracture toughness of the HGS1 sample can be attributed to the stronger hardening around the crack tip by the smaller spacing of planar slip bands and the stronger precipitation hardening.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108707"},"PeriodicalIF":4.3,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure and hardening mechanisms of oxygen-doped (Fe3Co2Ni2Cr3)94-xAlxO6 multi-principal element alloys

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-15 DOI: 10.1016/j.intermet.2025.108655

Xin Han , Chong Peng , Guangtong Zhou , Chan Han , Kenan Li , Ningchang Wang , Shuju Liang , Rui Li , Yujiao Ke

A series of oxygen-doped (Fe₃Co₂Ni₂Cr₃)_94-xAl_xO₆ (x = 3–7 at.%) multi-principal element alloys (MPEAs) was synthesized via mechanical alloying (MA) and subsequently consolidated by high-pressure and high-temperature sintering (HPHT), and the effect of Al contents on the microstructure and hardening mechanisms was investigated systematically. Detailed microstructural characterizations indicate that (Fe₃Co₂Ni₂Cr₃)_94-xAl_xO₆ MPEAs are composed of nanocrystalline FCC matrix, and ultrafine grained Cr-rich oxides, as well as the particle size of the Cr-rich oxides decreases and the distribution is gradually uniform with increasing Al contents. The (Fe₃Co₂Ni₂Cr₃)₈₇Al₇O₆ MPEA contains small nanocrystalline Al-rich oxides. Attributed to grain boundary strengthening and strain hardening, (Fe₃Co₂Ni₂Cr₃)₈₇Al₇O₆ shows a high Vickers hardness of 6.98 ± 0.16 GPa, higher than that of most previously reported FCC structured HEAs. Estimated from Tabor's equation, the Tabor's ratio attains a value of ∼2.96, consistent with that of conventional polycrystalline materials. This work provides a novel pathway for hardening MPEAs and widens the design toolbox for other high-performance materials, given the typical Tabor ratio.

{"title":"Microstructure and hardening mechanisms of oxygen-doped (Fe3Co2Ni2Cr3)94-xAlxO6 multi-principal element alloys","authors":"Xin Han , Chong Peng , Guangtong Zhou , Chan Han , Kenan Li , Ningchang Wang , Shuju Liang , Rui Li , Yujiao Ke","doi":"10.1016/j.intermet.2025.108655","DOIUrl":"10.1016/j.intermet.2025.108655","url":null,"abstract":"<div><div>A series of oxygen-doped (Fe3Co2Ni2Cr3)94-xAlxO6 (x = 3–7 at.%) multi-principal element alloys (MPEAs) was synthesized via mechanical alloying (MA) and subsequently consolidated by high-pressure and high-temperature sintering (HPHT), and the effect of Al contents on the microstructure and hardening mechanisms was investigated systematically. Detailed microstructural characterizations indicate that (Fe3Co2Ni2Cr3)94-xAlxO6 MPEAs are composed of nanocrystalline FCC matrix, and ultrafine grained Cr-rich oxides, as well as the particle size of the Cr-rich oxides decreases and the distribution is gradually uniform with increasing Al contents. The (Fe3Co2Ni2Cr3)87Al7O6 MPEA contains small nanocrystalline Al-rich oxides. Attributed to grain boundary strengthening and strain hardening, (Fe3Co2Ni2Cr3)87Al7O6 shows a high Vickers hardness of 6.98 ± 0.16 GPa, higher than that of most previously reported FCC structured HEAs. Estimated from Tabor's equation, the Tabor's ratio attains a value of ∼2.96, consistent with that of conventional polycrystalline materials. This work provides a novel pathway for hardening MPEAs and widens the design toolbox for other high-performance materials, given the typical Tabor ratio.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108655"},"PeriodicalIF":4.3,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadening the working temperature interval in a magneto-structural coupled Ni–Mn–Ga microparticle via introducing a free surface

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-13 DOI: 10.1016/j.intermet.2025.108704

Shijiang Zhong , Mengjiao Wang , Mingfang Qian , Xinhao Wan , Xuexi Zhang , Lin Geng

In the field of magnetic refrigeration, magnetic materials that can exhibit both a giant magnetic entropy change (ΔS_m) and a widened working temperature interval (δT_FWHM) are being pursued. To obtain an enhanced magnetic entropy change, this study designed a magneto-structural coupled (i.e., overlapping the martensitic and magnetic transitions) Ni–Mn–Ga bulk ingot; however, it possessed a relatively narrow δT_FWHM of 10 K. To broaden its δT_FWHM, a microparticle with size varying from ∼38.5 to 45 μm was produced by grinding the bulk ingot and by subsequently subjecting it to stress relief annealing (SRA). Consequently, an expanded martensitic transformation width of 14 K and a broadened δT_FWHM of 15 K were achieved in the SRA state. Meanwhile, the average magnetic hysteresis was reduced from 21.8 J kg⁻¹ to 16.8 J kg⁻¹ by preparing the alloy in the microparticle configuration. Therefore, an enhanced net refrigeration capacity value of 104.0 J kg⁻¹ under 5 T was achieved in the SRA microparticle compared with that of 57.7 J kg⁻¹ in the bulk ingot. The strategy of increasing the specific surface area and regulating the internal stress can be used to expand a refrigerant's δT_FWHM, thereby helping achieve a higher magnetic refrigeration capacity in Ni–Mn–X alloys.

{"title":"Broadening the working temperature interval in a magneto-structural coupled Ni–Mn–Ga microparticle via introducing a free surface","authors":"Shijiang Zhong , Mengjiao Wang , Mingfang Qian , Xinhao Wan , Xuexi Zhang , Lin Geng","doi":"10.1016/j.intermet.2025.108704","DOIUrl":"10.1016/j.intermet.2025.108704","url":null,"abstract":"<div><div>In the field of magnetic refrigeration, magnetic materials that can exhibit both a giant magnetic entropy change (ΔSm) and a widened working temperature interval (δTFWHM) are being pursued. To obtain an enhanced magnetic entropy change, this study designed a magneto-structural coupled (i.e., overlapping the martensitic and magnetic transitions) Ni–Mn–Ga bulk ingot; however, it possessed a relatively narrow δTFWHM of 10 K. To broaden its δTFWHM, a microparticle with size varying from ∼38.5 to 45 μm was produced by grinding the bulk ingot and by subsequently subjecting it to stress relief annealing (SRA). Consequently, an expanded martensitic transformation width of 14 K and a broadened δTFWHM of 15 K were achieved in the SRA state. Meanwhile, the average magnetic hysteresis was reduced from 21.8 J kg−1 to 16.8 J kg−1 by preparing the alloy in the microparticle configuration. Therefore, an enhanced net refrigeration capacity value of 104.0 J kg−1 under 5 T was achieved in the SRA microparticle compared with that of 57.7 J kg−1 in the bulk ingot. The strategy of increasing the specific surface area and regulating the internal stress can be used to expand a refrigerant's δTFWHM, thereby helping achieve a higher magnetic refrigeration capacity in Ni–Mn–X alloys.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108704"},"PeriodicalIF":4.3,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An investigation on high-temperature properties of a lightweight AlNbTiV2 refractory high-entropy alloy reinforced by Si

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-12 DOI: 10.1016/j.intermet.2025.108705

Tiantian Wang , Wentao Jiang , Xiaohong Wang , Bo Jiang , Xin Wang , Ye Wang , Hongyu Xu , Maoliang Hu , Dongdong Zhu

A series of novel AlNbTiV₂Si_x (x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) refractory high-entropy alloys were fabricated by vacuum arc melting. The effects of Si content on the crystal structure, microstructure and high-temperature mechanical properties of the alloys were systematically investigated, and the mechanism of properties enhancement was analyzed in depth. The results showed that the addition of Si resulted in the formation of a hexagonal close-packed M₅Si₃-type silicide phase (M = Al, Nb, Ti, and V), transforming the alloy from a single BCC structure to a dual-phase structure of BCC + M₅Si₃, and increasing the volume fraction of M₅Si₃ phase to 23.1 %. Furthermore, an increase in Si content is beneficial to reduce the density of the alloy. When the Si content reaches 0.5, the alloy density decreases by about 7.0 %. The results of high-temperature compression tests show that the yield strength of AlNbTiV₂Si_x alloys has increased by nearly 70 % at 873 K, and AlNbTiV₂Si_0.5 alloy has the highest yield strength at 1073 K, reaching 1154 MPa. The mechanism of properties enhancement is attributed to the second phase strengthening. When the temperature continues to increase to 1273 K, the strengthening effect of silicides becomes weaker, and the yield strength of AlNbTiV₂Si_x alloys is not significantly different, all around 200 MPa, indicating the dominant role of solid solution strengthening. In addition, the solidification path of AlNbTiV₂Si_x alloys was analyzed and discussed. Our current work contributes to the design of new high-performance lightweight alloys with controllable structure, and provides a reference for future research, development, and production utilization.

{"title":"An investigation on high-temperature properties of a lightweight AlNbTiV2 refractory high-entropy alloy reinforced by Si","authors":"Tiantian Wang , Wentao Jiang , Xiaohong Wang , Bo Jiang , Xin Wang , Ye Wang , Hongyu Xu , Maoliang Hu , Dongdong Zhu","doi":"10.1016/j.intermet.2025.108705","DOIUrl":"10.1016/j.intermet.2025.108705","url":null,"abstract":"<div><div>A series of novel AlNbTiV2Six (x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) refractory high-entropy alloys were fabricated by vacuum arc melting. The effects of Si content on the crystal structure, microstructure and high-temperature mechanical properties of the alloys were systematically investigated, and the mechanism of properties enhancement was analyzed in depth. The results showed that the addition of Si resulted in the formation of a hexagonal close-packed M5Si3-type silicide phase (M = Al, Nb, Ti, and V), transforming the alloy from a single BCC structure to a dual-phase structure of BCC + M5Si3, and increasing the volume fraction of M5Si3 phase to 23.1 %. Furthermore, an increase in Si content is beneficial to reduce the density of the alloy. When the Si content reaches 0.5, the alloy density decreases by about 7.0 %. The results of high-temperature compression tests show that the yield strength of AlNbTiV2Six alloys has increased by nearly 70 % at 873 K, and AlNbTiV2Si0.5 alloy has the highest yield strength at 1073 K, reaching 1154 MPa. The mechanism of properties enhancement is attributed to the second phase strengthening. When the temperature continues to increase to 1273 K, the strengthening effect of silicides becomes weaker, and the yield strength of AlNbTiV2Six alloys is not significantly different, all around 200 MPa, indicating the dominant role of solid solution strengthening. In addition, the solidification path of AlNbTiV2Six alloys was analyzed and discussed. Our current work contributes to the design of new high-performance lightweight alloys with controllable structure, and provides a reference for future research, development, and production utilization.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108705"},"PeriodicalIF":4.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of non-ferromagnetic element content on magnetic properties of FeCoMnAlSi high entropy alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-12 DOI: 10.1016/j.intermet.2025.108703

Z.B. Song , T.X. Huang , Aditya Jain , Y.G. Wang

High-entropy alloys have attracted considerable attention due to their advantages such as versatility and customizable properties. The customizable properties in soft magnetic high-entropy alloys mainly come from non-ferromagnetic elements, but it is challenging to maintain good soft magnetic properties while increasing the proportion of non-ferromagnetic elements. In this study, the ratio of non-ferromagnetic elements is systematically adjusted in the FeCoMnAlSi high-entropy alloy to explore its influence on soft magnetic properties. The structure of the alloys transforms in a sequence of FCC + BCC → BCC → BCC + B2 as the proportion of non-ferromagnetic elements increases. The soft magnetic properties of the system are significantly influenced by non-ferromagnetic elements. The dependence of saturation magnetization (M_s) on the proportion of non-ferromagnetic elements exhibits an И-shaped pattern, while that of coercivity (H_c) follows a V-shaped trend. Notably, the alloy (Fe_4/5Co_1/5)₇₈(Mn_10/23Al_10/23Si_3/23)₂₂ exhibits an exceptionally high M_s of 189.12 emu·g⁻¹ and a low H_c of 1.9 Oe. Simulation calculations indicated that the enhancement in M_s results from a reduction in the antiferromagnetic coupling between Fe and Mn, coupled with an improved efficiency of the ferromagnetic transformation in Mn.

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引用次数: 0

The effect of microstructure evolution on the high-temperature mechanical properties and creep behavior of Y2O3-bearing alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-12 DOI: 10.1016/j.intermet.2025.108702

Yingfei Guo , Wenjing Liang , Jiayan Zhou , Shulong Xiao , Lijuan Xu , Yu Liang , Yuyong Chen

In this study, various heat treatment processes were employed to adjust the ratio of blocky γ phase to α₂/γ lamellae and to create conditions conducive to the precipitation of Y₂O₃ nanoparticles. The aim was to investigate the influence of microstructure evolution on the high-temperature mechanical properties and creep behavior of the Ti-48Al-2Cr-2Nb-0.05Y₂O₃ alloy. As the holding temperature increases from 1200 °C to 1350 °C, the content of the blocky γ phase decreases from 61.49 % to 1.12 %, resulting in the formation of nearly duplex (NDP) microstructure, duplex (DP) microstructure, nearly lamellar (NL) microstructure, and fully lamellar (FL) microstructure. The combination of elevated temperature conditions and increased crystal defects promotes the precipitation of Y₂O₃ nanoparticles, leading to the highest number of nanoscale reinforcements within the FL microstructure. As the heat-treated sample transitions from the NDP to FL microstructure, the ultimate tensile strength tested at 800 °C increases from 384 MPa to 668 MPa, while the creep life tested at 800 °C under 325 MPa improves from 10.8 h to 138.2 h. The elongation and creep strain initially increase and then decrease, with the heat-treated sample exhibiting an NL microstructure demonstrating the best high-temperature elongation of 21.48 % and the highest creep strain of 19.55 %. The favorable ductility and deformation capacity observed in the NL microstructure can be attributed to the cooperative deformation of the lamellar structure and its surrounding blocky γ phase. The excellent high-temperature strength and creep resistance of the FL microstructure result from the synergistic strengthening effect arising from a greater number of nanoscale Y₂O₃ precipitates and the highest content of lamellar colonies, which provide an effective pinning effect on dislocation movement. In comparison to commonly used reinforcements, the heat-treated TiAl alloys reinforced with dual-scale Y₂O₃ particles exhibit remarkable high-temperature properties, which are anticipated to further enhance the service temperature of TiAl alloys and expand their application at elevated temperatures.

{"title":"The effect of microstructure evolution on the high-temperature mechanical properties and creep behavior of Y2O3-bearing alloy","authors":"Yingfei Guo , Wenjing Liang , Jiayan Zhou , Shulong Xiao , Lijuan Xu , Yu Liang , Yuyong Chen","doi":"10.1016/j.intermet.2025.108702","DOIUrl":"10.1016/j.intermet.2025.108702","url":null,"abstract":"<div><div>In this study, various heat treatment processes were employed to adjust the ratio of blocky γ phase to α2/γ lamellae and to create conditions conducive to the precipitation of Y2O3 nanoparticles. The aim was to investigate the influence of microstructure evolution on the high-temperature mechanical properties and creep behavior of the Ti-48Al-2Cr-2Nb-0.05Y2O3 alloy. As the holding temperature increases from 1200 °C to 1350 °C, the content of the blocky γ phase decreases from 61.49 % to 1.12 %, resulting in the formation of nearly duplex (NDP) microstructure, duplex (DP) microstructure, nearly lamellar (NL) microstructure, and fully lamellar (FL) microstructure. The combination of elevated temperature conditions and increased crystal defects promotes the precipitation of Y2O3 nanoparticles, leading to the highest number of nanoscale reinforcements within the FL microstructure. As the heat-treated sample transitions from the NDP to FL microstructure, the ultimate tensile strength tested at 800 °C increases from 384 MPa to 668 MPa, while the creep life tested at 800 °C under 325 MPa improves from 10.8 h to 138.2 h. The elongation and creep strain initially increase and then decrease, with the heat-treated sample exhibiting an NL microstructure demonstrating the best high-temperature elongation of 21.48 % and the highest creep strain of 19.55 %. The favorable ductility and deformation capacity observed in the NL microstructure can be attributed to the cooperative deformation of the lamellar structure and its surrounding blocky γ phase. The excellent high-temperature strength and creep resistance of the FL microstructure result from the synergistic strengthening effect arising from a greater number of nanoscale Y2O3 precipitates and the highest content of lamellar colonies, which provide an effective pinning effect on dislocation movement. In comparison to commonly used reinforcements, the heat-treated TiAl alloys reinforced with dual-scale Y2O3 particles exhibit remarkable high-temperature properties, which are anticipated to further enhance the service temperature of TiAl alloys and expand their application at elevated temperatures.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108702"},"PeriodicalIF":4.3,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The strain field near the γ/γ′ interface in Ni-Al binary model single crystal superalloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-11 DOI: 10.1016/j.intermet.2025.108690

Congqi Fu , Bowen Zhang , Xiaona Zhang , Lin Ge , Yumo Wen , Hui Li , Tao Yu , Chongyu Wang , Ze Zhang

The strain field near the γ/γ′ interface has a significant influence on the morphology evolution and the mechanical properties of Ni-based single crystal superalloys. The present work precisely determines the strain field near the γ/γ′ interface in a Ni-Al binary model single crystal superalloy by a combined usage of convergent beam electron diffraction (CBED) and high-resolution transmission electron microscopy (HRTEM) method. At positions slightly away from the γ/γ′ interface, the variation of lattice is sensitively measured by using standard CBED method. Within the range of about 10 nm close to the γ/γ′ interface, which is difficult to obtain a clear HOLZ pattern through traditional CBED solely, by using the CBED-calibrated HRTEM results, the complete lattice distortion and strain field are obtained. There is compressive strain in the γ′ phase and tensile strain in the γ phase, and the lattice strain affects a range as long as 80 nm near γ/γ′ interface. The strain distribution in the two phases is asymmetric, with the strain field in the γ phase obviously larger than in the γ′ phase. Our results provide important fundamental data for understands on the relationship between microstructure evolution and properties of Ni-based single crystal superalloys.

{"title":"The strain field near the γ/γ′ interface in Ni-Al binary model single crystal superalloy","authors":"Congqi Fu , Bowen Zhang , Xiaona Zhang , Lin Ge , Yumo Wen , Hui Li , Tao Yu , Chongyu Wang , Ze Zhang","doi":"10.1016/j.intermet.2025.108690","DOIUrl":"10.1016/j.intermet.2025.108690","url":null,"abstract":"<div><div>The strain field near the γ/γ′ interface has a significant influence on the morphology evolution and the mechanical properties of Ni-based single crystal superalloys. The present work precisely determines the strain field near the γ/γ′ interface in a Ni-Al binary model single crystal superalloy by a combined usage of convergent beam electron diffraction (CBED) and high-resolution transmission electron microscopy (HRTEM) method. At positions slightly away from the γ/γ′ interface, the variation of lattice is sensitively measured by using standard CBED method. Within the range of about 10 nm close to the γ/γ′ interface, which is difficult to obtain a clear HOLZ pattern through traditional CBED solely, by using the CBED-calibrated HRTEM results, the complete lattice distortion and strain field are obtained. There is compressive strain in the γ′ phase and tensile strain in the γ phase, and the lattice strain affects a range as long as 80 nm near γ/γ′ interface. The strain distribution in the two phases is asymmetric, with the strain field in the γ phase obviously larger than in the γ′ phase. Our results provide important fundamental data for understands on the relationship between microstructure evolution and properties of Ni-based single crystal superalloys.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108690"},"PeriodicalIF":4.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0