Intermetallics最新文献

英文中文

A prediction model of failure threshold for shear deformation in a Zr-based bulk metallic glass

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108602

H.R. Cheng , Z. Wang , J. Brechtl , W. Wen , M. Zhang , Z.H. Wang , J.W. Qiao

The failure of bulk metallic glasses (BMGs) during plastic deformation at room temperature is abrupt and instantaneous, while the analysis of precursor information based on avalanche events helps predict catastrophic failure. An acoustic emission (AE) signal can provide accurate precursor information for material failure, due to its sensitive and high fast calculation ability. In the current study, AE monitoring tests are carried out during uniaxial compression tests of BMGs at different strain rates. The AE experimental failure threshold, E_max, is proposed on the basis of AE cumulative energy, which reflects the intensity of damage evolution at different loading conditions. Compared with the critical shear band velocity (CSBV) associated with stick-slip dynamics of serrated flow, E_max is a more sensitive failure parameter since it is connected with the local microscopic changes that occur during the material response process. Here, the E_max is obtained prior to reaching the CSBV since the calculation of these two avalanches analysis focuses on the different stages of shear band growth. In particular, AE events are related to the “dry” friction process in the first stage, however, the CSBV is responsible for the “viscous” glide in the second stage. Therefore, E_max is not affected by the complex interactions between the shear bands during the stick-slip process. The maximum avalanche of serrated flow, S_max, is proposed as the experimental failure threshold, which depends on the applied strain rate as

S_{\max} \sim {\dot{ε}}^{- λ}

. According to the relationship of E_max and S_max, the theoretical failure threshold, E_max, follows a criterion

E_{\max} = 2545 {\dot{ε}}^{- λ} ‐ 4468

, where λ is equivalent to 0.15 for this work. Combining the different calculations and AE measurements, this model gives new insights to predict the deformation failure behavior of Zr-based BMGs.

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引用次数: 0

Revealing the disparate defect evolution paths with loading rates for ductile and brittle metallic glasses via nanoscale creep

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108584

F.C. Wang , Y.H. Gao , M.C. Jian , Y.B. Wang , Y. Huang , Y.Y. Sun , Y.Z. Liu , F. Xu , C. Kursun , Y. Zhang , J.T. Huo , J.Q. Wang , M. Gao

Ductile and brittle metallic glasses display significantly different mechanical behaviors. However, the microscopic deformation mechanisms and the defect dynamics in different metallic glasses remain unclear. In this work, an experimental strategy based on nanoscale creep was used to detect the defect evolution dynamics at different loading rates for six metallic glasses with varying plasticity. The plastic deformation ability and the strain rate sensitivity of these metallic glasses under different loading rates were systematically investigated. Furthermore, the evolution of defect volume and relaxation time spectrum under varying loading rates was analyzed utilizing the Cooperative Shearing model in conjunction with the Maxwell-Kelvin model. It was observed that ductile and brittle metallic glasses display markedly different defect dynamics at varying loading rates. Finally, a scheme was introduced to illustrate different defect evolution paths with various loading rates for ductile and brittle metallic glasses based on their heterogeneous viscoelastic structure. The study provides insights into the differences in microscopic deformation mechanism and their structural origins in various amorphous materials.

{"title":"Revealing the disparate defect evolution paths with loading rates for ductile and brittle metallic glasses via nanoscale creep","authors":"F.C. Wang , Y.H. Gao , M.C. Jian , Y.B. Wang , Y. Huang , Y.Y. Sun , Y.Z. Liu , F. Xu , C. Kursun , Y. Zhang , J.T. Huo , J.Q. Wang , M. Gao","doi":"10.1016/j.intermet.2024.108584","DOIUrl":"10.1016/j.intermet.2024.108584","url":null,"abstract":"<div><div>Ductile and brittle metallic glasses display significantly different mechanical behaviors. However, the microscopic deformation mechanisms and the defect dynamics in different metallic glasses remain unclear. In this work, an experimental strategy based on nanoscale creep was used to detect the defect evolution dynamics at different loading rates for six metallic glasses with varying plasticity. The plastic deformation ability and the strain rate sensitivity of these metallic glasses under different loading rates were systematically investigated. Furthermore, the evolution of defect volume and relaxation time spectrum under varying loading rates was analyzed utilizing the Cooperative Shearing model in conjunction with the Maxwell-Kelvin model. It was observed that ductile and brittle metallic glasses display markedly different defect dynamics at varying loading rates. Finally, a scheme was introduced to illustrate different defect evolution paths with various loading rates for ductile and brittle metallic glasses based on their heterogeneous viscoelastic structure. The study provides insights into the differences in microscopic deformation mechanism and their structural origins in various amorphous materials.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108584"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095885","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 Cu on thermal and magnetocaloric properties of (GdTbHo)CoAl high-entropy metallic glasses

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108607

Z. Wang , J.Y. Ruan , F. Jin, W. Li, C.C. Yuan

(Gd_1/3Tb_1/3Ho_1/3)₅₅Co_17.5Al_27.5-xCu_x (x = 5, 10, 15, and 20) metallic glasses (MGs) with a high configurational entropy (ΔS_conf) of 1.723–1.754 R were successfully prepared by arc melting technology. Their glass-forming ability (GFA), thermodynamic behavior, and magnetocaloric effect (MCE) upon Cu addition were investigated thoroughly. Upon Cu addition, both T_g and the T_x significantly decrease with increasing 3d electron number due to the weakened f-d hybridization effect. The (Gd_1/3Tb_1/3Ho_1/3)₅₅Co_17.5Al_12.5Cu₁₅ with 15 at. % Cu exhibits a maximum value of GFA criteria, including T_rg, γ, and γ_m, as well as the lowest degree of structural order, indicating its optimal GFA, which is likely associated with the high-entropy effect and suppressed crystallization behavior. Moreover, it is found that the refrigeration capacity (RCP) also reaches a peak value of 624.83 J kg⁻¹ with a relatively larger peak magnetic entropy change (

| Δ S_{M}^{p k} |

) of 8.75 J kg⁻¹ K⁻¹ at the composition with 15 at. % Cu, accompanied by an abnormally high Curie temperature (T_C) of 59 K, which is attributed to the high experimental μ_eff of (Gd_1/3Tb_1/3Ho_1/3)₅₅Co_17.5Al_12.5Cu₁₅ as a result of the intensified magnetic interaction between rare-earth (RE) elements for alloying Cu with small size. Our work indicates that Cu is an effective element for manipulating the thermal and magnetic properties of magnetocaloric materials by influencing their microstructure, orbital hybridization effects, and magnetic exchange interactions.

{"title":"Effect of Cu on thermal and magnetocaloric properties of (GdTbHo)CoAl high-entropy metallic glasses","authors":"Z. Wang , J.Y. Ruan , F. Jin, W. Li, C.C. Yuan","doi":"10.1016/j.intermet.2024.108607","DOIUrl":"10.1016/j.intermet.2024.108607","url":null,"abstract":"<div><div>(Gd1/3Tb1/3Ho1/3)55Co17.5Al27.5-xCux (x = 5, 10, 15, and 20) metallic glasses (MGs) with a high configurational entropy (ΔSconf) of 1.723–1.754 R were successfully prepared by arc melting technology. Their glass-forming ability (GFA), thermodynamic behavior, and magnetocaloric effect (MCE) upon Cu addition were investigated thoroughly. Upon Cu addition, both Tg and the Tx significantly decrease with increasing 3d electron number due to the weakened f-d hybridization effect. The (Gd1/3Tb1/3Ho1/3)55Co17.5Al12.5Cu15 with 15 at. % Cu exhibits a maximum value of GFA criteria, including Trg, γ, and γm, as well as the lowest degree of structural order, indicating its optimal GFA, which is likely associated with the high-entropy effect and suppressed crystallization behavior. Moreover, it is found that the refrigeration capacity (RCP) also reaches a peak value of 624.83 J kg−1 with a relatively larger peak magnetic entropy change (<math><mrow><mrow><mrow><mo>|</mo><mo>Δ</mo></mrow><msubsup><mi>S</mi><mi>M</mi><mrow><mi>p</mi><mi>k</mi></mrow></msubsup></mrow><mo>|</mo></mrow></math>) of 8.75 J kg−1 K−1 at the composition with 15 at. % Cu, accompanied by an abnormally high Curie temperature (TC) of 59 K, which is attributed to the high experimental μeff of (Gd1/3Tb1/3Ho1/3)55Co17.5Al12.5Cu15 as a result of the intensified magnetic interaction between rare-earth (RE) elements for alloying Cu with small size. Our work indicates that Cu is an effective element for manipulating the thermal and magnetic properties of magnetocaloric materials by influencing their microstructure, orbital hybridization effects, and magnetic exchange interactions.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108607"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095894","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

Corrosion and passive behaviors of the Co-Cr-Fe-Ni-Nb eutectic high-entropy alloys in different electrolyte solutions

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108586

Fengyi Zhang , Lijun Zhang , Xueming Wei , Chunzhi Zhang , Qixiang Jia , Kai Sun , Dongtao Duan , Gong Li

The corrosion and passive behaviors of CoCrFeNiNb_x (x = 0.3, 0.45, 0.6) high-entropy alloys with eutectic microstructures were studied in different electrolyte solutions (0.6 M NaCl, 0.6 M Na₂SO₄, and 0.6 M H₂SO₄). The potentiodynamic polarisation test showed that the pitting potential of Nb0.45 alloy reached 1.084V, and the alloy had the best corrosion resistance in Na₂SO₄ solution. Mott Schottky tests and X-ray photoelectron spectroscopy tests on the Nb0.45 alloy, and it was found that different film forming mechanisms in neutral and acidic solutions. A double-layer passivation film mainly composed of Cr(OH)₃, Cr₂O₃, and Nb₂O₅ was formed. These studies provide basic theoretical reference for the preparation of new corrosion resistant high-entropy alloys.

引用次数: 0

Nanoindentation behavior of the laser-repaired CoCrFeNiV high-entropy alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108585

Chao Wang , Weihai Huang , Chunxue Yi , Minqiang Jiang , Hu Huang , Jiwang Yan

High-entropy alloys (HEAs) are solid-solution alloys composed of multiple elements, exhibiting excellent mechanical properties. The unique plastic deformation mechanism induced by their specific solid solution structures has attracted considerable attention but remains incompletely understood, particularly at the micro-scale. In this study, the surface morphology, chemical composition, and microstructures of CoCrFeNiV HEA before and after laser remelting repair were investigated. Nanoindentation testing was employed to characterize the surface hardness and creep behavior of the repaired surface. The distribution of surface hardness before and after laser remelting, as well as the indentation creep behavior under different loads, were studied. The mechanism of indentation creep on the repaired surface was discussed and analyzed. The effect of microstructures of HEAs, including precipitated phases and sub-grain boundaries, on dislocation-dominated micro-scale plastic deformation was elucidated by the transmission electron microscope (TEM). This study contributes to an in-depth understanding of the creep behavior and micro-scale deformation mechanisms in HEAs.

{"title":"Nanoindentation behavior of the laser-repaired CoCrFeNiV high-entropy alloy","authors":"Chao Wang , Weihai Huang , Chunxue Yi , Minqiang Jiang , Hu Huang , Jiwang Yan","doi":"10.1016/j.intermet.2024.108585","DOIUrl":"10.1016/j.intermet.2024.108585","url":null,"abstract":"<div><div>High-entropy alloys (HEAs) are solid-solution alloys composed of multiple elements, exhibiting excellent mechanical properties. The unique plastic deformation mechanism induced by their specific solid solution structures has attracted considerable attention but remains incompletely understood, particularly at the micro-scale. In this study, the surface morphology, chemical composition, and microstructures of CoCrFeNiV HEA before and after laser remelting repair were investigated. Nanoindentation testing was employed to characterize the surface hardness and creep behavior of the repaired surface. The distribution of surface hardness before and after laser remelting, as well as the indentation creep behavior under different loads, were studied. The mechanism of indentation creep on the repaired surface was discussed and analyzed. The effect of microstructures of HEAs, including precipitated phases and sub-grain boundaries, on dislocation-dominated micro-scale plastic deformation was elucidated by the transmission electron microscope (TEM). This study contributes to an in-depth understanding of the creep behavior and micro-scale deformation mechanisms in HEAs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108585"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095887","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

Interfacial reaction and IMC growth kinetics at the Bi2Te3/Ag interface during isothermal aging 等温老化过程中 Bi2Te3/Ag 界面的界面反应和 IMC 生长动力学

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-31 DOI: 10.1016/j.intermet.2025.108686

Seong-Woo Pak , Hiroaki Tatsumi , Jianhao Wang , Albert T. Wu , Hiroshi Nishikawa

Bonding materials that can withstand high operating temperatures are essential for increasing the conversion efficiencies of thermoelectric power-generation devices. Sn-based solders commonly used to join thermoelectric materials and electrodes have the disadvantage of limiting the maximum operating temperature to 150 °C because of their low melting point. To overcome this limitation, in the present study, Ag nanoparticle paste with high-temperature stability, low electrical resistivity, high thermal conductivity, and printability was used for bonding a Bi₂Te₃ thermoelectric material and an electroless nickel immersion gold (ENIG)-plated Cu electrode.

We performed isothermal aging at 200 °C from 0 to 1000 h to analyze the microstructural and thickness changes in intermetallic compounds (IMCs). Initially, a heterogeneous distribution of the IMC layers was observed at the bonding interface; over time, the IMC structures became clearly distinct. The IMC thickness increased from ≤3.0 μm (initial) to 45.6 μm in 1000 h, growing by a factor of approximately 15.2. We analyzed the growth kinetics of AgTe and BiTe IMCs. The growth exponent n of the AgTe IMC was found to be 0.3, indicating grain boundary diffusion with grain-growth control, whereas the n value of the BiTe IMC was 0.5, which is consistent with volumetric diffusion-controlled growth. These differences in the growth behavior indicate that different diffusion mechanisms affect the reliability and performance of the bonding interface.

{"title":"Interfacial reaction and IMC growth kinetics at the Bi2Te3/Ag interface during isothermal aging","authors":"Seong-Woo Pak , Hiroaki Tatsumi , Jianhao Wang , Albert T. Wu , Hiroshi Nishikawa","doi":"10.1016/j.intermet.2025.108686","DOIUrl":"10.1016/j.intermet.2025.108686","url":null,"abstract":"<div><div>Bonding materials that can withstand high operating temperatures are essential for increasing the conversion efficiencies of thermoelectric power-generation devices. Sn-based solders commonly used to join thermoelectric materials and electrodes have the disadvantage of limiting the maximum operating temperature to 150 °C because of their low melting point. To overcome this limitation, in the present study, Ag nanoparticle paste with high-temperature stability, low electrical resistivity, high thermal conductivity, and printability was used for bonding a Bi2Te3 thermoelectric material and an electroless nickel immersion gold (ENIG)-plated Cu electrode.</div><div>We performed isothermal aging at 200 °C from 0 to 1000 h to analyze the microstructural and thickness changes in intermetallic compounds (IMCs). Initially, a heterogeneous distribution of the IMC layers was observed at the bonding interface; over time, the IMC structures became clearly distinct. The IMC thickness increased from ≤3.0 μm (initial) to 45.6 μm in 1000 h, growing by a factor of approximately 15.2. We analyzed the growth kinetics of AgTe and BiTe IMCs. The growth exponent n of the AgTe IMC was found to be 0.3, indicating grain boundary diffusion with grain-growth control, whereas the n value of the BiTe IMC was 0.5, which is consistent with volumetric diffusion-controlled growth. These differences in the growth behavior indicate that different diffusion mechanisms affect the reliability and performance of the bonding interface.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108686"},"PeriodicalIF":4.3,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the plasticity and inheritance in shear-band-rejuvenated metallic glasses

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-31 DOI: 10.1016/j.intermet.2025.108685

H.B. Zhou , X.H. Jing , L. Yu , G. Ding , S.L. Cai , C.J. Shi , L.H. Dai , M.Q. Jiang , G. Wilde

Structural rejuvenation holds promise for enhancing the plastic deformability of metallic glasses. However, whether structural rejuvenation through the introduction of shear bands unequivocally leads to enhanced plasticity remains contentious. Herein, we investigated two metallic glasses with distinct initial energy states: as-cast and well-relaxed. These glasses underwent a 50 % thickness reduction through cold rolling. Cold rolling significantly reduces the plasticity of as-cast glasses but notably enhances plasticity along the rolling direction for annealed glasses. This underscores the dependence of plasticity in processed glasses on both the initial state and shear band distribution. Additionally, it was observed that cold-rolled glasses exhibit plastic anisotropy, and re-vitrified glasses remarkably inherit this behavior. Synchrotron X-ray diffraction analysis further revealed that the transformation from face-shared to edge-shared or vertex-shared medium-range orders plays a significant role in the plastic response of glasses. Our findings suggest that regulating shear band distribution, along with appropriate re-vitrification treatment, provides a promising strategy to tailor the structure and properties of metallic glasses.

{"title":"On the plasticity and inheritance in shear-band-rejuvenated metallic glasses","authors":"H.B. Zhou , X.H. Jing , L. Yu , G. Ding , S.L. Cai , C.J. Shi , L.H. Dai , M.Q. Jiang , G. Wilde","doi":"10.1016/j.intermet.2025.108685","DOIUrl":"10.1016/j.intermet.2025.108685","url":null,"abstract":"<div><div>Structural rejuvenation holds promise for enhancing the plastic deformability of metallic glasses. However, whether structural rejuvenation through the introduction of shear bands unequivocally leads to enhanced plasticity remains contentious. Herein, we investigated two metallic glasses with distinct initial energy states: as-cast and well-relaxed. These glasses underwent a 50 % thickness reduction through cold rolling. Cold rolling significantly reduces the plasticity of as-cast glasses but notably enhances plasticity along the rolling direction for annealed glasses. This underscores the dependence of plasticity in processed glasses on both the initial state and shear band distribution. Additionally, it was observed that cold-rolled glasses exhibit plastic anisotropy, and re-vitrified glasses remarkably inherit this behavior. Synchrotron X-ray diffraction analysis further revealed that the transformation from face-shared to edge-shared or vertex-shared medium-range orders plays a significant role in the plastic response of glasses. Our findings suggest that regulating shear band distribution, along with appropriate re-vitrification treatment, provides a promising strategy to tailor the structure and properties of metallic glasses.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108685"},"PeriodicalIF":4.3,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171713","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

Study on recrystallization and phase transformation of Ti-43Al-4Nb-1Mo-0.2B alloy during the inter-pass annealing 层间退火过程中 Ti-43Al-4Nb-1Mo-0.2B 合金的再结晶和相变研究

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-30 DOI: 10.1016/j.intermet.2025.108681

Xiaofei Chen , Bin Tang , Beibei Wei , Xichuan Cao , Xiangyu Pan , Huiqin Wang , Guoming Zheng , Jinshan Li

The multi-pass thermomechanical process is a common forming method employed for brittle metallic materials such as TiAl alloys, where complex recrystallization behavior and phase transformation are utilized to promote grain refinement and microstructural evolution. Thermal simulation compression experiments at 1200 °C/0.01 s⁻¹ were performed to investigate the recrystallization and phase transformation during inter-pass annealing. The results showed that a little dynamic recrystallization (DRX) preferentially occurred within the β_o+γ mixed structures and along the boundaries of α₂+γ lamellar colonies. Moreover, the inter-pass annealing had little effect on recrystallization of α₂ phase, but facilitated the α/α₂→β/β_o phase transformation to accelerate the fragmentation of α₂ lamellae. Also, the pre-deformed β_o phase mainly underwent static recrystallization (SRX), which was enhanced with the increasing the proceeding-pass strain and inter-pass annealing duration. The recrystallization mechanisms of α₂ and β_o phase were continuous recrystallizations, where nucleation inoculation or early nucleation induced the weak recrystallization texture similar to deformation texture in local regions, yet insufficient recrystallization eliminated the texture. The extension of annealing time at different strains was favorable for SRX of the γ phase, but meta-recrystallization (MDRX) could only occur in short-time annealing at high strains. Consequently, the design and optimization of multi-pass deformation process were proposed.

{"title":"Study on recrystallization and phase transformation of Ti-43Al-4Nb-1Mo-0.2B alloy during the inter-pass annealing","authors":"Xiaofei Chen , Bin Tang , Beibei Wei , Xichuan Cao , Xiangyu Pan , Huiqin Wang , Guoming Zheng , Jinshan Li","doi":"10.1016/j.intermet.2025.108681","DOIUrl":"10.1016/j.intermet.2025.108681","url":null,"abstract":"<div><div>The multi-pass thermomechanical process is a common forming method employed for brittle metallic materials such as TiAl alloys, where complex recrystallization behavior and phase transformation are utilized to promote grain refinement and microstructural evolution. Thermal simulation compression experiments at 1200 °C/0.01 s−1 were performed to investigate the recrystallization and phase transformation during inter-pass annealing. The results showed that a little dynamic recrystallization (DRX) preferentially occurred within the βo+γ mixed structures and along the boundaries of α2+γ lamellar colonies. Moreover, the inter-pass annealing had little effect on recrystallization of α2 phase, but facilitated the α/α2→β/βo phase transformation to accelerate the fragmentation of α2 lamellae. Also, the pre-deformed βo phase mainly underwent static recrystallization (SRX), which was enhanced with the increasing the proceeding-pass strain and inter-pass annealing duration. The recrystallization mechanisms of α2 and βo phase were continuous recrystallizations, where nucleation inoculation or early nucleation induced the weak recrystallization texture similar to deformation texture in local regions, yet insufficient recrystallization eliminated the texture. The extension of annealing time at different strains was favorable for SRX of the γ phase, but meta-recrystallization (MDRX) could only occur in short-time annealing at high strains. Consequently, the design and optimization of multi-pass deformation process were proposed.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108681"},"PeriodicalIF":4.3,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182237","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

Experimental investigation of isothermal section in the La-Ni-Si system at 1073 K

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-30 DOI: 10.1016/j.intermet.2025.108671

Tianlei Zhang , Kai Wang , Kailin Huang , Qingrong Yao , Zhao Lu , Qianxin Long , Jianqiu Deng , Jiang Wang , Huaiying Zhou

The isothermal section of the La-Ni-Si ternary system at 1073 K has been constructed in this work by using X-ray diffraction (XRD), and back-scattered electron (BSE) mode equipped with an electron probe microanalysis (EPMA). The 17 ternary compounds have been confirmed in the isothermal sections at 1073 K: LaNi_11.6–9.5Si_1.4–3.5, LaNi_8.8–8.4Si_4.2–4.6, LaNi_7.8–6.5Si_5.2–6.5, LaNi₂Si₂, LaNiSi₂, La₂NiSi₃, LaNiSi, La₁₄Ni₆Si₁₁, La₁₅Ni₄Si₁₃, LaNi₉Si₂, La₂NiSi, La₆Ni₂Si₃, LaNi₄Si, La₃Ni₃Si₂, La₂Ni₃Si₂, LaNi₂Si, and La₂(Ni,Si). This isothermal section also consists of 44 + 6 three-phase regions. At 1073K, the maximum solid solubility of Si in the (Ni) phase is about 10.28 at.%, the maximum solid solubility of Si in the (LaNi₅) phase is about 11.80 at.%, and the maximum solid solubility of Ni in the β-LaSi₂ phase is about 6.09 at.%. The present experimental results could be used as guidance to practical applications and input to future thermodynamic assessments.

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引用次数: 0

Low plastic deformation: Its impact on the microstructural evolution during heat treatment of nickel-based wrought superalloy GH4698 低塑性变形：低塑性变形：对镍基锻造超级合金 GH4698 热处理过程中微观结构演变的影响

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-01-29 DOI: 10.1016/j.intermet.2025.108678

Shi-chang Qiao , Na Li , Xin-yu Gao , Xin Wen , Feng-zhen Wang , Zhi-kang Xia , Yong-qiang Wang , Jin-zhe Jiang , Shuai Liu , Chao Yuan

A comprehensive investigation into the effects of low plastic deformation (LPD) at ambient temperature on the microstructural evolution of the nickel-based wrought superalloy GH4698 during solution heat treatment (SHT) was conducted. Applying 2%–10 % LPD to cylindrical specimens did not markedly alter the grain morphology. However, a portion of the initial annealing twin boundaries (TBs) would transform into other types of grain boundaries under the application of the stress field. Deformation microstructures with effective strains ranging from 0.025 to 0.042 (corresponding to the entire region of the 4 % deformed sample and the near-end region of the 6 % deformed sample) exhibited a pronounced increase in twin fraction during SHT, accompanied by the formation of multiple large twin-related domains (TRDs) and several abnormally large grains (ALGs). The occurrence of TRDs and their internal ALGs stems from the constrained nucleation of recrystallization and extensive twinning. The residual strain energy not alleviated through recrystallization, driven by thermal stress, initiates twin nucleation and promotes grain boundary migration. The emergence and disappearance of island-like twins, as well as twins terminating within grains, suggest that the introduced TBs include not only coherent TBs but also potentially highly mobile incoherent TBs during the evolution of TRDs.

我们全面研究了固溶热处理（SHT）过程中环境温度下的低塑性变形（LPD）对镍基锻造超级合金 GH4698 微观结构演变的影响。对圆柱形试样施加 2%-10% 的 LPD 不会明显改变晶粒形态。然而，在应力场的作用下，部分初始退火孪晶界（TB）会转变为其他类型的晶界。有效应变范围在 0.025 至 0.042 之间的变形微结构（对应于 4% 变形样品的整个区域和 6% 变形样品的近端区域）在 SHT 过程中显示出孪晶部分的明显增加，并伴随着多个大型孪晶相关畴（TRDs）和多个异常大晶粒（ALGs）的形成。TRDs 及其内部 ALGs 的出现源于受约束的再结晶成核和广泛的孪晶。在热应力的驱动下，未通过再结晶得到缓解的残余应变能引发了孪晶成核，并促进了晶界迁移。岛状孪晶以及终止于晶粒内部的孪晶的出现和消失表明，在 TRDs 演化过程中，引入的 TB 不仅包括相干 TB，还包括潜在的高流动性非相干 TB。

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