Intermetallics最新文献

英文中文

Effects of Mg content on fatigue behavior of wrought Al–8Si–(0.33–1.32)Mg alloy sheets in T4 temper

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-03 DOI: 10.1016/j.intermet.2025.108684

Guangdong Wang , Tian Hua , Yinghao Liu , Yue Tian , Shuying Chen , Jingyi Cao , Yiran Zhou

In this paper, microstructure, fatigue life and fatigue fracture behavior of Al–8Si–(0.33–1.32)Mg (mass fraction, %) alloy sheets in T4 temper were systematically investigated by scanning electron microscopy/energy dispersive spectroscopy, electron backscatter diffraction, transmission electron microscopy and high frequency fatigue tests. The results show that when the stress ratio R = 0 and the stress level is 165 MPa, the fatigue properties of Al–8Si–(0.33–1.32)Mg alloy sheets in T4 temper first increase and then decrease with the increase of Mg content. When the Mg content is 0.78 %–0.99 %, the fatigue life is the longest, reaching 7.14 × 10⁵∼2.99 × 10⁶ cycles. Fatigue cracks of Al–8Si–(0.33–0.99)Mg alloy sheets in T4 temper initiate at the persistent slip band. The fatigue crack initiation of Al–8Si–1.32Mg alloy sheet initiates at particles-associated aggregation area (PAA), and the fatigue initiation life of Al–8Si–1.32Mg alloy sheet is significantly shortened. PAA has little effect on tensile properties, but significant effect on fatigue properties. PAA can be regarded as a special defect affecting fatigue properties of materials. The stress concentration is the largest at particle orientation 0°. In addition, the smaller the particle spacing, the greater the stress concentration, the easier the crack initiation under applied load, when the particle spacing is greater than one particle spacing, the particle aggregation effect disappears. This study optimizes the fatigue behavior of high-silicon wrought aluminum alloy by controlling the Mg content and discovers a novel fatigue defect (PAA), providing important scientific insights for optimizing alloy properties and meeting diverse industrial needs.

{"title":"Effects of Mg content on fatigue behavior of wrought Al–8Si–(0.33–1.32)Mg alloy sheets in T4 temper","authors":"Guangdong Wang , Tian Hua , Yinghao Liu , Yue Tian , Shuying Chen , Jingyi Cao , Yiran Zhou","doi":"10.1016/j.intermet.2025.108684","DOIUrl":"10.1016/j.intermet.2025.108684","url":null,"abstract":"<div><div>In this paper, microstructure, fatigue life and fatigue fracture behavior of Al–8Si–(0.33–1.32)Mg (mass fraction, %) alloy sheets in T4 temper were systematically investigated by scanning electron microscopy/energy dispersive spectroscopy, electron backscatter diffraction, transmission electron microscopy and high frequency fatigue tests. The results show that when the stress ratio <em>R</em> = 0 and the stress level is 165 MPa, the fatigue properties of Al–8Si–(0.33–1.32)Mg alloy sheets in T4 temper first increase and then decrease with the increase of Mg content. When the Mg content is 0.78 %–0.99 %, the fatigue life is the longest, reaching 7.14 × 10<sup>5</sup>∼2.99 × 10<sup>6</sup> cycles. Fatigue cracks of Al–8Si–(0.33–0.99)Mg alloy sheets in T4 temper initiate at the persistent slip band. The fatigue crack initiation of Al–8Si–1.32Mg alloy sheet initiates at particles-associated aggregation area (PAA), and the fatigue initiation life of Al–8Si–1.32Mg alloy sheet is significantly shortened. PAA has little effect on tensile properties, but significant effect on fatigue properties. PAA can be regarded as a special defect affecting fatigue properties of materials. The stress concentration is the largest at particle orientation 0°. In addition, the smaller the particle spacing, the greater the stress concentration, the easier the crack initiation under applied load, when the particle spacing is greater than one particle spacing, the particle aggregation effect disappears. This study optimizes the fatigue behavior of high-silicon wrought aluminum alloy by controlling the Mg content and discovers a novel fatigue defect (PAA), providing important scientific insights for optimizing alloy properties and meeting diverse industrial needs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108684"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104028","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 mechanical properties of FeCoNiCrTix high entropy alloys by selective laser melting

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-03 DOI: 10.1016/j.intermet.2025.108683

Chengbao Wang , Wenhua Guo , Qianyu Ji , Yihui Zhang , Jiacheng Zhang , Bingheng Lu

The design idea of high entropy alloys (HEAs) has opened up a new era of alloy material science. Dense and crack-free FeCoNiCrTi_x HEAs (X = 0,0.4, referred to as Ti₀, Ti_0.4) were prepared by selective laser melting (SLM). By varying the laser power and scanning speed, the effects of laser process parameters on the mechanism of porosity formation, densification, organization, weaving evolution and mechanical properties of HEA specimens were systematically investigated. The results show that with increasing laser power or decreasing scanning speed, the tissues exhibit epitaxial growth across multiple melt pool boundaries, with a slight enhancement of crystal orientation in the <001>BD direction. The Ti_0.4 HEAs possess the best mechanical properties, with microhardness 426.61 HV_0.5, tensile strength 1355.49 MPa and elongation rate 7.54 %, respectively. The improved mechanical properties of Ti_0.4 HEA are mainly attributed to solid solution strengthening, fine grain strengthening (average grain size of about 4.2 μm) and discontinuous distribution of NiTi phase. The conclusions of the related studies provide an important theoretical basis for the selection of process parameters for the preparation of HEAs by SLM.

{"title":"Microstructure and mechanical properties of FeCoNiCrTix high entropy alloys by selective laser melting","authors":"Chengbao Wang , Wenhua Guo , Qianyu Ji , Yihui Zhang , Jiacheng Zhang , Bingheng Lu","doi":"10.1016/j.intermet.2025.108683","DOIUrl":"10.1016/j.intermet.2025.108683","url":null,"abstract":"<div><div>The design idea of high entropy alloys (HEAs) has opened up a new era of alloy material science. Dense and crack-free FeCoNiCrTi<sub>x</sub> HEAs (X = 0,0.4, referred to as Ti<sub>0</sub>, Ti<sub>0.4</sub>) were prepared by selective laser melting (SLM). By varying the laser power and scanning speed, the effects of laser process parameters on the mechanism of porosity formation, densification, organization, weaving evolution and mechanical properties of HEA specimens were systematically investigated. The results show that with increasing laser power or decreasing scanning speed, the tissues exhibit epitaxial growth across multiple melt pool boundaries, with a slight enhancement of crystal orientation in the <001>BD direction. The Ti<sub>0.4</sub> HEAs possess the best mechanical properties, with microhardness 426.61 HV<sub>0.5</sub>, tensile strength 1355.49 MPa and elongation rate 7.54 %, respectively. The improved mechanical properties of Ti<sub>0.4</sub> HEA are mainly attributed to solid solution strengthening, fine grain strengthening (average grain size of about 4.2 μm) and discontinuous distribution of NiTi phase. The conclusions of the related studies provide an important theoretical basis for the selection of process parameters for the preparation of HEAs by SLM.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108683"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171712","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 Al variation on microstructure and properties of porous FeCoNiCrAlx high-entropy alloys synthesized via thermal explosion

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-03 DOI: 10.1016/j.intermet.2025.108687

Bowen Tang , Zhichao Shang , Weijia Guo , Zixuan Pang , Farid Akhtar , Jianzhong Wang , Baojing Zhang , Shiheng Li , Peizhong Feng

Porous FeCoNiCrAl_x high-entropy alloys (HEAs) with excellent resistance to high-temperature oxidation and corrosion were synthesized by a novel thermal explosion (TE) reaction. This method combines the advantages of FeCoNiCrAl_x HEAs and porous intermetallic compounds as high-temperature filtration materials. The effects of Al atomic fraction on the microstructure and phase composition of FeCoNiCrAl_x HEAs were studied. A comprehensive assessment of the mechanical properties, oxidation resistance, and corrosion resistance of these materials was also evaluated. The results indicate that the main phase structure of HEAs has a transition from FCC to BCC with the increase of Al addition. Meanwhile, the intermetallic compound B2 phase precipitates out of the matrix and significantly enhances the mechanical properties of FeCoNiCrAl_x HEAs. Adding Al improves not only the porosity (32.05 %) and compression performance (σ_max = 219.44 MPa, ε_max = 2.93 %) of porous FeCoNiCrAl_x but also enhances the oxidation resistance of the alloy at 1000 °C and corrosion resistance in 3.5 wt% NaCl solution. The 20 at.% Al sample (Al-20) forms a continuous Al₂O₃ protective film on the skeleton of porous HEAs, and the mass gain is only 3.48 % after 120 h oxidation at 1000 °C. Al-5 promotes the generation of passivation films and improves the stability of passivation films, effectively limiting the electrochemical reaction of the material.

{"title":"Effect of Al variation on microstructure and properties of porous FeCoNiCrAlx high-entropy alloys synthesized via thermal explosion","authors":"Bowen Tang , Zhichao Shang , Weijia Guo , Zixuan Pang , Farid Akhtar , Jianzhong Wang , Baojing Zhang , Shiheng Li , Peizhong Feng","doi":"10.1016/j.intermet.2025.108687","DOIUrl":"10.1016/j.intermet.2025.108687","url":null,"abstract":"<div><div>Porous FeCoNiCrAl<sub>x</sub> high-entropy alloys (HEAs) with excellent resistance to high-temperature oxidation and corrosion were synthesized by a novel thermal explosion (TE) reaction. This method combines the advantages of FeCoNiCrAl<sub>x</sub> HEAs and porous intermetallic compounds as high-temperature filtration materials. The effects of Al atomic fraction on the microstructure and phase composition of FeCoNiCrAl<sub>x</sub> HEAs were studied. A comprehensive assessment of the mechanical properties, oxidation resistance, and corrosion resistance of these materials was also evaluated. The results indicate that the main phase structure of HEAs has a transition from FCC to BCC with the increase of Al addition. Meanwhile, the intermetallic compound B2 phase precipitates out of the matrix and significantly enhances the mechanical properties of FeCoNiCrAl<sub>x</sub> HEAs. Adding Al improves not only the porosity (32.05 %) and compression performance (σ<sub>max</sub> = 219.44 MPa, ε<sub>max</sub> = 2.93 %) of porous FeCoNiCrAl<sub>x</sub> but also enhances the oxidation resistance of the alloy at 1000 °C and corrosion resistance in 3.5 wt% NaCl solution. The 20 at.% Al sample (Al-20) forms a continuous Al<sub>2</sub>O<sub>3</sub> protective film on the skeleton of porous HEAs, and the mass gain is only 3.48 % after 120 h oxidation at 1000 °C. Al-5 promotes the generation of passivation films and improves the stability of passivation films, effectively limiting the electrochemical reaction of the material.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"180 ","pages":"Article 108687"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104022","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

Behavior of tungsten-particle-reinforced Zirconium-based bulk metallic glass composites when penetrating a semi-infinite target

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108601

Huie Hu , Haoyu Jin , Junhan Chi , Yifan Du , Yunfei Ma

This study investigates the penetration behavior of 50 % vol. W-reinforced Zr-based bulk metallic glass composites (W_p/Zr-BMGCs) with W particle sizes of 30, 75, and 250 μm using semi-infinite target penetration tests. The composites and craters were characterized via X-ray diffraction, optical microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The impact velocities during the tests were approximately 850 and 1250 m s⁻¹. The results show that the penetration depth of the W_p/Zr-BMGCs at high impact velocities is greater than that at low impact velocities. At similar impact velocities, the smaller the particle sizes constituting the reinforcing phase, the greater the penetration depth. Among the composites, W_p/Zr-BMGC with a W particle size of 30 μm achieves a maximum penetration depth of 10.62 mm at an impact velocity of 1283.8 m s⁻¹. During penetration, the Zr-based amorphous phase melts and W particles primarily undergo plastic deformation. Adiabatic shear bands generated during penetration promote the nucleation and propagation of voids and cracks, resulting in target-plate damage. High-speed penetration-induced unloading waves generate coronal cracks near the bottom of the crater, accelerating target-plate damage. The good penetration capability of the W_p/Zr-based amorphous composite with 30-μm W particles may be related to the beneficial effects of the small W particles on interfacial bonding.

{"title":"Behavior of tungsten-particle-reinforced Zirconium-based bulk metallic glass composites when penetrating a semi-infinite target","authors":"Huie Hu , Haoyu Jin , Junhan Chi , Yifan Du , Yunfei Ma","doi":"10.1016/j.intermet.2024.108601","DOIUrl":"10.1016/j.intermet.2024.108601","url":null,"abstract":"<div><div>This study investigates the penetration behavior of 50 % vol. W-reinforced Zr-based bulk metallic glass composites (W<sub>p</sub>/Zr-BMGCs) with W particle sizes of 30, 75, and 250 μm using semi-infinite target penetration tests. The composites and craters were characterized via X-ray diffraction, optical microscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The impact velocities during the tests were approximately 850 and 1250 m s<sup>−1</sup>. The results show that the penetration depth of the W<sub>p</sub>/Zr-BMGCs at high impact velocities is greater than that at low impact velocities. At similar impact velocities, the smaller the particle sizes constituting the reinforcing phase, the greater the penetration depth. Among the composites, W<sub>p</sub>/Zr-BMGC with a W particle size of 30 μm achieves a maximum penetration depth of 10.62 mm at an impact velocity of 1283.8 m s<sup>−1</sup>. During penetration, the Zr-based amorphous phase melts and W particles primarily undergo plastic deformation. Adiabatic shear bands generated during penetration promote the nucleation and propagation of voids and cracks, resulting in target-plate damage. High-speed penetration-induced unloading waves generate coronal cracks near the bottom of the crater, accelerating target-plate damage. The good penetration capability of the W<sub>p</sub>/Zr-based amorphous composite with 30-μm W particles may be related to the beneficial effects of the small W particles on interfacial bonding.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108601"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095382","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

Role of Mo on microstructure evolution and dry-sliding wear mechanism of CoCrNi-based laser cladding coatings

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108599

S.S. Liu , C.L. Fan , J.F. Wang , X.H. Wang , C.J. Zhou

CoCrNiMo_x coatings were prepared on the surface of 1045 steel using coaxial powder feeding laser cladding. The effects of different Mo addition on microstructure evolution, micro-hardness, and wear resistance under different friction condition of the laser cladding coatings were investigated. The results show that there is a critical amount for Mo on the structural transformation of CoCrNi. When mole ratio of Mo ≤ 0.4, the coatings is mainly composed of FCC eutectic structure, and when the mole ratio of Mo ≥ 0.6, a large amount of hard and brittle laves phase of NiMo₂-type structure is formed in the coatings, which results in the increased in micro-hardness of the coatings. At the same time, the addition of Mo affect the dilution rate at the interface. During the wear tests under YG6, Si₃N₄, and GCr15 frictional pairs, the dominant factors affecting the effect of Mo addition on CoCrNi medium-entropy alloys are the amount of Mo-rich eutectic structures and the formation of laves phases. Additionally, hardness and surface state of the frictional pairs are also major factors affecting the wear resistance differences of CoCrNiMo_x medium-entropy alloys under different friction pair effects.

{"title":"Role of Mo on microstructure evolution and dry-sliding wear mechanism of CoCrNi-based laser cladding coatings","authors":"S.S. Liu , C.L. Fan , J.F. Wang , X.H. Wang , C.J. Zhou","doi":"10.1016/j.intermet.2024.108599","DOIUrl":"10.1016/j.intermet.2024.108599","url":null,"abstract":"<div><div>CoCrNiMo<sub>x</sub> coatings were prepared on the surface of 1045 steel using coaxial powder feeding laser cladding. The effects of different Mo addition on microstructure evolution, micro-hardness, and wear resistance under different friction condition of the laser cladding coatings were investigated. The results show that there is a critical amount for Mo on the structural transformation of CoCrNi. When mole ratio of Mo ≤ 0.4, the coatings is mainly composed of FCC eutectic structure, and when the mole ratio of Mo ≥ 0.6, a large amount of hard and brittle laves phase of NiMo<sub>2</sub>-type structure is formed in the coatings, which results in the increased in micro-hardness of the coatings. At the same time, the addition of Mo affect the dilution rate at the interface. During the wear tests under YG6, Si<sub>3</sub>N<sub>4</sub>, and GCr15 frictional pairs, the dominant factors affecting the effect of Mo addition on CoCrNi medium-entropy alloys are the amount of Mo-rich eutectic structures and the formation of laves phases. Additionally, hardness and surface state of the frictional pairs are also major factors affecting the wear resistance differences of CoCrNiMo<sub>x</sub> medium-entropy alloys under different friction pair effects.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108599"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095384","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

Directional design and preparation of Ti-Nb based alloys with predicted high strength and low modulus for biomedical applications: Insights from first-principles calculations

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108580

Huaihao Chen , Shiwen Hu , Lixin Wang , Linhong Deng

This paper presents the design of β-type Ti-Nb based alloys characterized by high strength and low modulus for biomedical applications. We used a Python program that applied the d-electron alloy design method and the valence electron concentration e/a method to suggest Ti-Nb based ternary alloys with specific desired characteristics, and then determined the modulus of these alloys through first-principles calculations and experimental investigations. The theoretic predication indicated that Ti₁₂Nb₃Zr₁ and Ti₁₂Nb₃Ta₁ as-cast were metastable β titanium alloys with good ductility even after 90 % cold deformation and a high elastic allowable strain (R_eH/E). The higher dislocation density led to a higher strength of the alloys. The formation of {111}<112>γ-fiber texture and {112}<111> slip was beneficial for the alloys to maintain characteristic low modulus. The experimental results showed that the elastic modulus of Ti₁₂Nb₃Ta₁ following cold rolling was slightly higher than that theoretically predicted. This discrepancy could be attributed to the formation of the α" phase with high modulus. It was also confirmed that the stable crystal structure of the simulated β-type Ti-Nb based alloy could be ensured during significant deformation under the experimental conditions, and this stability was dependent on the bonding capacity of the inner electrons. Thus this study offers both theoretical and experimental support for the fabrication of Ti-Nb based alloys that are designed with characteristic low modulus and high strength as novel orthopedic implants materials.

{"title":"Directional design and preparation of Ti-Nb based alloys with predicted high strength and low modulus for biomedical applications: Insights from first-principles calculations","authors":"Huaihao Chen , Shiwen Hu , Lixin Wang , Linhong Deng","doi":"10.1016/j.intermet.2024.108580","DOIUrl":"10.1016/j.intermet.2024.108580","url":null,"abstract":"<div><div>This paper presents the design of <em>β</em>-type Ti-Nb based alloys characterized by high strength and low modulus for biomedical applications. We used a Python program that applied the <em>d</em>-electron alloy design method and the valence electron concentration <em>e</em>/<em>a</em> method to suggest Ti-Nb based ternary alloys with specific desired characteristics, and then determined the modulus of these alloys through first-principles calculations and experimental investigations. The theoretic predication indicated that Ti<sub>12</sub>Nb<sub>3</sub>Zr<sub>1</sub> and Ti<sub>12</sub>Nb<sub>3</sub>Ta<sub>1</sub> as-cast were metastable <em>β</em> titanium alloys with good ductility even after 90 % cold deformation and a high elastic allowable strain (<em>R</em><sub>eH</sub>/<em>E</em>). The higher dislocation density led to a higher strength of the alloys. The formation of {111}<112><em>γ</em>-fiber texture and {112}<111> slip was beneficial for the alloys to maintain characteristic low modulus. The experimental results showed that the elastic modulus of Ti<sub>12</sub>Nb<sub>3</sub>Ta<sub>1</sub> following cold rolling was slightly higher than that theoretically predicted. This discrepancy could be attributed to the formation of the <em>α\"</em> phase with high modulus. It was also confirmed that the stable crystal structure of the simulated <em>β</em>-type Ti-Nb based alloy could be ensured during significant deformation under the experimental conditions, and this stability was dependent on the bonding capacity of the inner electrons. Thus this study offers both theoretical and experimental support for the fabrication of Ti-Nb based alloys that are designed with characteristic low modulus and high strength as novel orthopedic implants materials.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108580"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095881","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 annealing treatment on the phase transformation and mechanical properties of TA15 alloy fabricated by WAAM

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108590

Chao Wang , Zhongyi Yang , Yiwei Wang , Junzhen Yi , Guang Yang , Bo He

Wire arc additive manufacturing (WAAM) is a promising additive manufacturing technique with growing acceptance in aerospace applications. In this study, the effects of annealing treatment on the microstructure, texture and tensile properties of Ti-6.5Al-2Zr-1Mo-1V alloy fabricated by WAAM were investigated. The results indicated that the microstructure of the as-built specimens is composed of fine basketweave structure within the columnar prior-β grains. With the increase of annealing temperature, the microstructure of the specimen was transformed from fine basketweave structure to lamellar structure and then to bi-lamellar structure. Compared with the as-built specimen (0.48 μm), the average primary α phase thickness of the specimens annealed at 900 °C, 940 °C and 980 °C increased by 0.67 μm, 0.88 μm and 2.66 μm, respectively. Secondary α phases with width of 200 nm were also precipitated for the annealed specimen at 980 °C. In addition, compared with the as-built specimen (1014.8 ± 28.4 MPa, 5.87 %), the tensile strength of the annealed specimens at 900 °C (970.3 ± 9.5 MPa), 940 °C (929.1 ± 4.9 MPa) and 980 °C (922.4 ± 2.1 MPa) decreased slightly. The elongation of the specimens annealed at 900 °C, 940 °C and 980 °C increased by 63.5 %, 82.3 % and 125.4 %, respectively.

{"title":"Effect of annealing treatment on the phase transformation and mechanical properties of TA15 alloy fabricated by WAAM","authors":"Chao Wang , Zhongyi Yang , Yiwei Wang , Junzhen Yi , Guang Yang , Bo He","doi":"10.1016/j.intermet.2024.108590","DOIUrl":"10.1016/j.intermet.2024.108590","url":null,"abstract":"<div><div>Wire arc additive manufacturing (WAAM) is a promising additive manufacturing technique with growing acceptance in aerospace applications. In this study, the effects of annealing treatment on the microstructure, texture and tensile properties of Ti-6.5Al-2Zr-1Mo-1V alloy fabricated by WAAM were investigated. The results indicated that the microstructure of the as-built specimens is composed of fine basketweave structure within the columnar prior-β grains. With the increase of annealing temperature, the microstructure of the specimen was transformed from fine basketweave structure to lamellar structure and then to bi-lamellar structure. Compared with the as-built specimen (0.48 μm), the average primary α phase thickness of the specimens annealed at 900 °C, 940 °C and 980 °C increased by 0.67 μm, 0.88 μm and 2.66 μm, respectively. Secondary α phases with width of 200 nm were also precipitated for the annealed specimen at 980 °C. In addition, compared with the as-built specimen (1014.8 ± 28.4 MPa, 5.87 %), the tensile strength of the annealed specimens at 900 °C (970.3 ± 9.5 MPa), 940 °C (929.1 ± 4.9 MPa) and 980 °C (922.4 ± 2.1 MPa) decreased slightly. The elongation of the specimens annealed at 900 °C, 940 °C and 980 °C increased by 63.5 %, 82.3 % and 125.4 %, respectively.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"177 ","pages":"Article 108590"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095884","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

SiC incorporation effects on AlFeCrNiTi high entropy alloy morphology, mechanical and corrosion properties

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108583

Zahra Shojaei, Gholam Reza Khayati, Esmaeel Darezereshki

Using pulse electrodeposition method on copper substrates, AlFeCrNiTi high entropy alloy (HEA) coatings were successfully applied with various concentrations of silicon carbide (0, 10, 15 and 20 g/L) in the coating bath as reinforcement. Various techniques were used to investigate the created structure and its properties, including morphology, chemical composition, phase analysis, microhardness, corrosion, and wear. In the presence of silicon carbide particles, the coatings had a spherical morphology. The formation of HEA was confirmed by EDS, XRD, and thermodynamic calculations, which showed that the solid solution formed without silicon carbide and with silicon carbide was FCC + BCC and BCC respectively. Furthermore, the results of mechanical and corrosion properties showed that the fineness of the grains improved microhardness and wear resistance, and due to the formation of a continuous passive layer caused by silicon carbide powder, the corrosion current density in 3.5 wt% NaCl solution decreased to 0.79 A/cm² and the charge transfer resistance increased to 6810 Ω cm². Also, the sample with a concentration of 20 g/L of silicon carbide in the coating bath has better mechanical and corrosion properties than other samples.

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引用次数: 0

Bimodal structure, strength-plasticity synergy and exceptional wear behavior in the spark plasma sintered (CoCrFeNi)84(AlTi)16 medium/high entropy alloy systems

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108600

M. Torabi-Parizi

Medium/high entropy alloy (M/HEA) system compositions are promising in wear resistance with comprehensive mechanical performance to meet the demands of practical engineering and technological applications as a multi-functional material. Nevertheless, for nano/ultrafine grained M/HEAs, there is still rather limited consideration of the friction and wear performance. In the current work, we present a strategy to develop a spark plasma sintered (SPSed) (CoCrFeNi)₈₄(AlTi)₁₆ M/HEAs with low density, strength-plasticity synergy and excellent wear resistance via adjusting the heterogeneous bimodal and nanocrystalline structure of coupled medium/high entropy solid solution phases with proximate equal volume fraction in the presence of multicomponent submicron/nanometer intermetallic phases. The multiple scales-component-phase-driven structure of the (CoCrFeNi)₈₄(AlTi)₁₆ M/HEA systems results in superior mechanical properties for the 3 M/HEA system, where the micro hardness value, compressive yield strength (CYS), the ultimate compressive strength (UCS), the fracture strain (FS) and the specific yield strength are obtained about 676 HV, 1730 MPa, 2095 MPa, 11.5 % and 0.238 GPa cm³/g, respectively. Low coefficient of friction (low COF) of 0.17 and wear rate (WR) of 0.1 × 10⁻⁵ mm³N⁻¹m⁻¹ are achieved for the 3 M/HEA system, which are much lower than the reported M/HEAs and traditional wear resistance alloy. It is affected by synergy effect of hardness via the BCC phase, work hardenability and plastic deformation of FCC phase. For the 3 M/HEA system, the wear morphology is clearly detected as a smoother surface with the shallower grooves, representing that the main wear mechanism is an abrasive wear. Therefore, developing similar multiple scales-component-phase-driven structures may open an avenue for further optimization of the mechanical/wear performance of the M/HEA systems.

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引用次数: 0

Designing stronger γ′-hardened NiCoCr medium entropy alloys

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-02-01 DOI: 10.1016/j.intermet.2024.108591

Jianxiang Luo , Haoyu Xie , Bojing Guo , Zhongsheng Yang , Zhijia Zhang , Feng He

The γ′ precipitates have extensively enhanced the yield strength of NiCoCr-based medium entropy alloys (MEAs). However, further improvement is challenging since the precipitates’ volume fraction and size, which are currently used to tune the strengthening effect, have reached an optimal limit. Instead, here we propose to tune the composition of γ′ phase to overcome the above challenge. Through Ta microalloying, the precipitation strengthening effect of γ′ phase is enhanced by ∼34 % when the volume fraction and size of precipitates are almost the same. Detailed experimental and theoretical analysis evidenced the feasibility of our new strategy.

引用次数: 0

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