Materials Science and Engineering: A最新文献

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The effect of Y2O3 particles on the microstructure and mechanical properties of tungsten fiber-reinforced tungsten composites Y2O3 粒子对钨纤维增强钨复合材料微观结构和力学性能的影响
IF 6.1 2区 材料科学
Materials Science and Engineering: A Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147449
Y. Chen , C. Chen , J.H. Chen , K.L. Li , S. Wang , Y.F. Zhang , H.Y. Chen , T.H. Beri , J. Wang , L.M. Luo , Y.C. Wu
{"title":"The effect of Y2O3 particles on the microstructure and mechanical properties of tungsten fiber-reinforced tungsten composites","authors":"Y. Chen ,&nbsp;C. Chen ,&nbsp;J.H. Chen ,&nbsp;K.L. Li ,&nbsp;S. Wang ,&nbsp;Y.F. Zhang ,&nbsp;H.Y. Chen ,&nbsp;T.H. Beri ,&nbsp;J. Wang ,&nbsp;L.M. Luo ,&nbsp;Y.C. Wu","doi":"10.1016/j.msea.2024.147449","DOIUrl":"10.1016/j.msea.2024.147449","url":null,"abstract":"<div><div>Tungsten fiber-reinforced tungsten (W<sub>f</sub>/W) composites are a promising plasma-facing material, and the microstructure at the interface between W fibers and the W matrix greatly impacts performance. In this study, a new kind of W<sub>f</sub>/W-Y<sub>2</sub>O<sub>3</sub> composites was developed with the addition of Y<sub>2</sub>O<sub>3</sub> particles to the W matrix in order to modify the interface microstructure between W fibers and the matrix. The microstructure and mechanical properties of these composites were investigated through sintering at temperatures ranging from 1500 °C to 1800 °C. The Y<sub>2</sub>O<sub>3</sub> particles with a face-centered cubic crystal structure were formed at the interface between W fibers and the matrix, which is beneficial for weakening the bonding strength. The W<sub>f</sub>/W-Y<sub>2</sub>O<sub>3</sub> composites exhibited pseudo-plasticity at low sintering temperatures, which show the highest bending strength (261 MPa) and fracture energy (6.66 kJ/m<sup>2</sup>) at 1600 °C. The grains in W particles become the recrystallized nuclei on the surface of W fiber through the bonding of W powder and W fibers. Then, these recrystallized nuclei grow into W fibers by migration of bonding boundaries. However, the Y<sub>2</sub>O<sub>3</sub> particles in the W powder can inhibit the migration of grain boundaries, thereby suppressing the abnormal grain growth behavior at the surface of W fiber.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"918 ","pages":"Article 147449"},"PeriodicalIF":6.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534582","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
Improvement of gradient microstructure and properties of wire-arc directed energy deposition titanium alloy via laser shock peening 通过激光冲击强化改善线弧定向能沉积钛合金的梯度微观结构和性能
IF 6.1 2区 材料科学
Materials Science and Engineering: A Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147422
Guanda Qu , Wei Guo , Jiaxin Shi , Dongsheng He , Yongxin Zhang , Yihao Dong , Jiaxuan Chi , Zhikang Shen , Ying Li , Zhenlin Chen , Hongqiang Zhang
{"title":"Improvement of gradient microstructure and properties of wire-arc directed energy deposition titanium alloy via laser shock peening","authors":"Guanda Qu ,&nbsp;Wei Guo ,&nbsp;Jiaxin Shi ,&nbsp;Dongsheng He ,&nbsp;Yongxin Zhang ,&nbsp;Yihao Dong ,&nbsp;Jiaxuan Chi ,&nbsp;Zhikang Shen ,&nbsp;Ying Li ,&nbsp;Zhenlin Chen ,&nbsp;Hongqiang Zhang","doi":"10.1016/j.msea.2024.147422","DOIUrl":"10.1016/j.msea.2024.147422","url":null,"abstract":"<div><div>Wire-arc directed energy deposition (WADED) technology has been widely used in the remanufacturing of titanium alloy structural components benefited from with the advantages such as high deposition efficiency and low cost. However, due to the coarse and anisotropic microstructure, the complex internal stresses and processing-induced rough surface significantly reduce fatigue performance and reliability of the remanufactured structural components. In this work, surface modification of titanium alloy WADED repair component was carried out via laser shock peening (LSP), and its gradient structure, microhardness, residual stress and fatigue performance and enhancement mechanism were systematically investigated. Results indicated that the different microstructure of each region led to different responses under the action of LSP, which was related to the change of dislocation density. LSP induced crystal defects such as high-density dislocations, twins and stacking faults on the surface. A variety of crystal defects gradually decreased with the depth from the strengthened surface, formed a gradient microstructure and significantly affected the microhardness and residual stress of the repaired components. The surface hardness and compressive residual stress of the repaired components were greatly increased after LSP and the hardened layer and compressive residual stress depth affected layer were 600 μm and 800 μm, respectively. The average fatigue life of the additive repair component increased by 197 % under the synergistic effect of compressive residual stress and gradient microstructure.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"918 ","pages":"Article 147422"},"PeriodicalIF":6.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534584","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 cryogenic and room-temperature rolling on the microstructural evolution and mechanical behavior of spray-formed 7055 Al-Zn-Mg-Cu alloy 低温轧制和室温轧制对喷射成形 7055 Al-Zn-Mg-Cu 合金微观结构演变和力学行为的影响
IF 6.1 2区 材料科学
Materials Science and Engineering: A Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147453
Tian Zhou , Yangwei Wang , Jiawei Bao , Muhammad Abubaker Khan , Rui An , Hao Zhang , Pingluo Zhao , Mohamed A. Afifi
{"title":"Effect of cryogenic and room-temperature rolling on the microstructural evolution and mechanical behavior of spray-formed 7055 Al-Zn-Mg-Cu alloy","authors":"Tian Zhou ,&nbsp;Yangwei Wang ,&nbsp;Jiawei Bao ,&nbsp;Muhammad Abubaker Khan ,&nbsp;Rui An ,&nbsp;Hao Zhang ,&nbsp;Pingluo Zhao ,&nbsp;Mohamed A. Afifi","doi":"10.1016/j.msea.2024.147453","DOIUrl":"10.1016/j.msea.2024.147453","url":null,"abstract":"<div><div>This study investigates the effects of room-temperature rolling (RTR) and cryogenic rolling (CR) on the microstructure, mechanical properties, and fracture morphology of spray-formed (SF) 7055 Al-Zn-Mg-Cu alloy, with a focus on the deformation across reductions ranging from 20 % to 80 %. Utilizing SF as the base processing technique, the study aims to overcome challenges associated with the alloy's high content during conventional casting, such as segregation, grain coarsening, and the formation of internal defects. The findings indicate that CR significantly enhances the ductility and refines the microstructure of SF-7055 Al alloy compared to RTR, particularly at higher reductions. CR prevents the formation of severe cracks and maintains higher ductility and texture intensity, which are crucial for the demanding applications of this alloy in aerospace and transportation sectors. Microstructural analysis reveals that CR achieves a more uniform deformation, effectively reduces shear band formation, and facilitates the formation of finer and more evenly distributed precipitates due to suppressed solute atom mobility at cryogenic temperatures. Mechanical testing shows that CR enhances strength and hardness at lower reductions by maintaining high dislocation density, which does not annihilate as rapidly as in RTR. Tensile fracture analysis further demonstrates that CR leads to smoother fracture surfaces and fewer macroscopic cracks, indicating a more controlled failure mechanism. This study underscores the potential of cryogenic processing in improving the performance and applicability of high-strength Al alloys, offering significant insights for industrial applications where material reliability and enhanced mechanical properties are critical.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"918 ","pages":"Article 147453"},"PeriodicalIF":6.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552885","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
Achieving a remarkable strength–ductility combination in a novel casting AlCoCrNi high entropy alloy 在新型铸造铝钴铬镍高熵合金中实现出色的强度-电导率组合
IF 6.1 2区 材料科学
Materials Science and Engineering: A Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147436
Ning Xu , Yubo Huang , Xuming Liu , Dongpo Xuan , Huaile Lu , Shilei Li , Yan-dong Wang , Junsheng Wang
{"title":"Achieving a remarkable strength–ductility combination in a novel casting AlCoCrNi high entropy alloy","authors":"Ning Xu ,&nbsp;Yubo Huang ,&nbsp;Xuming Liu ,&nbsp;Dongpo Xuan ,&nbsp;Huaile Lu ,&nbsp;Shilei Li ,&nbsp;Yan-dong Wang ,&nbsp;Junsheng Wang","doi":"10.1016/j.msea.2024.147436","DOIUrl":"10.1016/j.msea.2024.147436","url":null,"abstract":"<div><div>We prepared a novel cast high-entropy alloy (HEA) that comprises a dual-phase microstructure with L1<sub>2</sub> and B2 phases. Our designed HEA achieved a remarkable strength–ductility balance (tensile strength of ∼1025 MPa and uniform elongation of ∼30 %, which well outperforms many as-cast HEAs including arc-melting and directly cast HEAs.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"918 ","pages":"Article 147436"},"PeriodicalIF":6.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534780","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
Metastability-driven room temperature strain hardening in a nitrogen added FeMnCoCrN high-entropy alloy 添加氮的铁锰钴铬镍高熵合金的铸造性驱动室温应变硬化
IF 6.1 2区 材料科学
Materials Science and Engineering: A Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147443
A. Tajik , A. Zarei-Hanzaki , Gunjick Lee , Seok Su Sohn , H.R. Abedi
{"title":"Metastability-driven room temperature strain hardening in a nitrogen added FeMnCoCrN high-entropy alloy","authors":"A. Tajik ,&nbsp;A. Zarei-Hanzaki ,&nbsp;Gunjick Lee ,&nbsp;Seok Su Sohn ,&nbsp;H.R. Abedi","doi":"10.1016/j.msea.2024.147443","DOIUrl":"10.1016/j.msea.2024.147443","url":null,"abstract":"<div><div>This study deals with the strain hardening capability of a nitrogen added FeMnCoCr high-entropy alloy during room temperature tensile deformation with an emphasize on the mechanical stability of FCC phase. The heightened metastability of the FCC phase provides a proper condition for hierarchical evolution of dual-phase FCC-HCP structure which finally promotes the formation of 63 % HCP martensite. Initially favoring slip mechanisms, the texture of the FCC phase transitions to geometrically hard orientations, thereby reducing its deformation accommodation capacity. This transition prompts the involvement of the HCP phase, initially evidenced by the emergence of new FCC phase and ε-twins at HCP martensite intersections. Subsequently, the formation of thickened ε-twins within the primary HCP lathes further contributes to deformation accommodation, explaining the observed excellent hardening behavior in the as-cast structure.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"918 ","pages":"Article 147443"},"PeriodicalIF":6.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537760","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 microstructure and synergistic enhancement mechanism of symmetric gradient SiCp-reinforced aluminum matrix sandwich structure 对称梯度 SiCp 增强铝基夹层结构的界面微结构和协同增强机制
IF 6.1 2区 材料科学
Materials Science and Engineering: A Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147452
Ying Guo , Wen-quan Li , Xin-gang Liu , Kai-yao Wang , Chao Zhang
{"title":"Interfacial microstructure and synergistic enhancement mechanism of symmetric gradient SiCp-reinforced aluminum matrix sandwich structure","authors":"Ying Guo ,&nbsp;Wen-quan Li ,&nbsp;Xin-gang Liu ,&nbsp;Kai-yao Wang ,&nbsp;Chao Zhang","doi":"10.1016/j.msea.2024.147452","DOIUrl":"10.1016/j.msea.2024.147452","url":null,"abstract":"<div><div>Inspired by the biological sandwich structure to achieve excellent mechanical properties with both high strength and high ductility, the symmetric gradient silicon carbide particles (SiCp) reinforced aluminum (Al) composites, consisting of 10 % SiCp/Al-3% SiCp/Al-Al-3% SiCp/Al-10 % SiCp/Al, was fabricated using spark plasma sintering technology. The flat interface was achieved through hot rolling, significantly improving the bonding of interlayers. The differences in SiCp content among layers led to distinct evolution patterns in microstructure. In the pure Al layer, a notable continuous recrystallization mechanism was observed, while in the 3 % SiCp/Al and 10 % SiCp/Al layers, the recrystallization mechanism was nucleation-growth. The transmission electron microscope results indicated that the hindrance of dislocation motion at the interlayer interface and SiCp-Al interface enhanced the dislocation density, thereby improving its plastic deformation capability. On the other hand, the deflection and passivation of cracks at the interlayer interface significantly improves toughness. The differences intragranular strain among layers were most pronounced at the interlayer interfaces, leading to them becoming the stress concentration zone. Uncoordinated plastic deformation leads to sequential failure of layers, vertical cracks first occurred in the 10 % SiCp/Al layer, then propagated towards the interlayer interface and the 3 % SiCp/Al layer, respectively.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"918 ","pages":"Article 147452"},"PeriodicalIF":6.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537781","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 hot-rolling process on the microstructure, mechanical and corrosion behaviors of dual-phase Co-based entropic alloys 热轧工艺对双相 Co 基熵合金微观结构、力学和腐蚀行为的影响
IF 6.1 2区 材料科学
Materials Science and Engineering: A Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147433
Wei Wang , Wenyu Zhao , Wangzhong Mu , Zhou Li , Zhankun Weng , Wenda Zhang , Nan Wang , Peikang Bai
{"title":"Effect of hot-rolling process on the microstructure, mechanical and corrosion behaviors of dual-phase Co-based entropic alloys","authors":"Wei Wang ,&nbsp;Wenyu Zhao ,&nbsp;Wangzhong Mu ,&nbsp;Zhou Li ,&nbsp;Zhankun Weng ,&nbsp;Wenda Zhang ,&nbsp;Nan Wang ,&nbsp;Peikang Bai","doi":"10.1016/j.msea.2024.147433","DOIUrl":"10.1016/j.msea.2024.147433","url":null,"abstract":"<div><div>Two compositions from dual-phase Co-based entropic alloys with high corrosion resistance were chosen, and the effect of hot-rolling process on the microstrcture, mechanical property and corrosion resistance was investigated in this work. The processing parameters were designed and optimized by CALPHAD calculations. For the case of hot-rolled alloys, fcc + hcp dual-phase structures were confirmed by different characterization techniques, including XRD, ECCI, and EBSD. After testing various mechanical properties and electrochemical corrosion behaviors at room temperature, the hot-rolled alloys exhibit an outstanding mechanical and corrosion resistance property. The hot-rolling process improves the electrochemical corrosion resistance slightly and promotes hardness as well as strength-ductility greatly. The experimental characterizations provide plentiful information about microstructure, crystallographic orientation, lattice misorientation, grain boundaries, and so on. More details for the strengthening and hardening mechanisms could be obtained from the EBSD analysis. The current work shed lights on the design of new alloy recipe as well as the synthesis of novel grade dual-phase entropic alloys with excellent combination of mechanical properties and corrosion resistance which could be applied in harsh environments.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"918 ","pages":"Article 147433"},"PeriodicalIF":6.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534481","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 evolution and fracture characteristics of GH4079 superalloy during high-temperature tensile process GH4079 超合金在高温拉伸过程中的微观结构演变和断裂特性
IF 6.1 2区 材料科学
Materials Science and Engineering: A Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147450
Tonggang Lu , Xingang Liu , Wenwen Zhang , Qiang Tian
{"title":"Microstructure evolution and fracture characteristics of GH4079 superalloy during high-temperature tensile process","authors":"Tonggang Lu ,&nbsp;Xingang Liu ,&nbsp;Wenwen Zhang ,&nbsp;Qiang Tian","doi":"10.1016/j.msea.2024.147450","DOIUrl":"10.1016/j.msea.2024.147450","url":null,"abstract":"<div><div>An investigation of the thermal deformation characteristics and fracture mechanisms of the GH4079 superalloy was conducted through a series of hot tensile experiments conducted across a range of strain rates (from 0.01 s<sup>−1</sup> to 1 s<sup>−1</sup>) and temperatures (from 970 °C to 1160 °C). The impact of MC carbides on the thermal deformation characteristics and dynamic recrystallization (DRX) of GH4079 superalloys, which are known for their challenging deformability, was analyzed to provide insights into enhancing the thermal workability of these formidable superalloys. The results suggest that DRX consistently preferentially occurs near MC carbides. The MC carbide plays a nucleation role in the particle-induced dynamic recrystallization mechanism, as determined via EBSD analysis. In addition, the primary grain boundary is the preferred nucleation site for DRX initiation. The promotion of DRX within the GH4079 alloy is considerably facilitated by the increased stored energy and nucleation site density resulting from the larger and more numerous carbides present at the grain boundaries. Moreover, the presence of carbides leads to uncoordinated deformation of the alloy during tensile deformation, which is also the induction factor of alloy cracking. With increasing strain rates and temperatures, the window of control over the hot deformation structure of the alloy diminishes. During the high-temperature deformation process of the GH4079 alloy, it is necessary to control the temperature within the range of approximately 1120 °C–1140 °C and the strain rate within the range of 0.1 s<sup>−1</sup> to 1 s<sup>−1</sup> to obtain a fine and uniform grain structure, delay material failure, and thus enhance the thermal processing performance of the material.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"918 ","pages":"Article 147450"},"PeriodicalIF":6.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534575","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
Exploring the effect of Cr and Mn on the intrinsic strength of the tensile properties of FeCoNi, FeCoNiMn, FeCoNiCr, and FeCoNiCrMn multi-principal element alloys using in-situ EBSD 利用原位 EBSD 探索铬和锰对铁钴镍合金、铁钴镍锰合金、铁钴镍铬合金和铁钴镍铬锰合金拉伸性能内在强度的影响
IF 6.1 2区 材料科学
Materials Science and Engineering: A Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147442
Xufeng Wang , Hongli Suo , Zili Zhang , Shangxiong Huangfu , Qiuliang Wang
{"title":"Exploring the effect of Cr and Mn on the intrinsic strength of the tensile properties of FeCoNi, FeCoNiMn, FeCoNiCr, and FeCoNiCrMn multi-principal element alloys using in-situ EBSD","authors":"Xufeng Wang ,&nbsp;Hongli Suo ,&nbsp;Zili Zhang ,&nbsp;Shangxiong Huangfu ,&nbsp;Qiuliang Wang","doi":"10.1016/j.msea.2024.147442","DOIUrl":"10.1016/j.msea.2024.147442","url":null,"abstract":"<div><div>As the composition elements in multi-principal element alloys increase, it can bring excellent mechanical properties. However, the strengthening mechanism of the additional element is still unclear. In this work, we establish a method based on the in-situ EBSD technology to explore the possible effect of additional elements on the intrinsic strength of tensile properties. We prepared four different multi-principal element alloys, including FeCoNi, FeCoNiMn, FeCoNiCr, and FeCoNiCrMn with similar initial status. We systematically investigated the evolution of the microstructure, dislocation density, twin boundary, grain size, and element distribution during the tensile process by in-situ EBSD and EDS. By carefully analyzing the results of four different multi-principal element alloys, the strength effects of the solid-solution hardening, grain-boundary hardening, twin boundary hardening, precipitate hardening, and dislocation hardening were peeled. The effect of the Cr and Mn element addition on the intrinsic strength can be explored. It is found that the element addition indeed increases the intrinsic strength from quaternary to quinary but not very clear from ternary to quaternary no matter Cr or Mn, which indicated that the intrinsic strength was more related to the number of elements in the alloy than to which element was present. This can be explained using the mixing entropy theory, which states that the intrinsic strength is enhanced when the mixing entropy is over a threshold between the MEA and HEA. This paper presents a method to study the individual factors affecting the tensile properties, which can help other researchers to better investigate HEA.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"918 ","pages":"Article 147442"},"PeriodicalIF":6.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537762","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
Laser microwelding of NiTi/PtIr alloys with laser beam offset 带激光束偏移的镍钛/铂铱合金激光微焊接
IF 6.1 2区 材料科学
Materials Science and Engineering: A Pub Date : 2024-10-22 DOI: 10.1016/j.msea.2024.147451
Tetsuya Oyamada, Kaiping Zhang, Y. Norman Zhou, Peng Peng
{"title":"Laser microwelding of NiTi/PtIr alloys with laser beam offset","authors":"Tetsuya Oyamada,&nbsp;Kaiping Zhang,&nbsp;Y. Norman Zhou,&nbsp;Peng Peng","doi":"10.1016/j.msea.2024.147451","DOIUrl":"10.1016/j.msea.2024.147451","url":null,"abstract":"<div><div>The NiTi and PtIr alloy joint has been employed in biomedical devices to combine the superelasticity of NiTi alloy with the X-ray visibility of PtIr alloy. Laser microwelding is usually used for the joints, but there is a risk of forming brittle intermetallic compounds (e.g., Ni<sub>3</sub>Ti, Ti<sub>2</sub>Ni, and Ti<sub>3</sub>Pt) in the fusion zone (FZ), which could deteriorate joint strength. In this study, laser beam offset (laser offset) was implemented for a butt joint of Ni-49.8 at.% Ti and Pt-10.0 at.% Ir alloy wires to control the intermetallic compound formation in the FZ. Welding with 300 μm laser offset on the NiTi side achieved 2.3 times higher joint breaking stress and 13.0 times higher joint breaking strain than welding without laser offset. The joint breaking stress and strain were enhanced from 221 MPa and 0.9 % to 502 MPa and 11.7 % by 300 μm laser offset on the NiTi side, respectively. In the absence of laser offset, the dissolution of Pt and Ir into the FZ facilitated the M<sub>3</sub>Ti (M = Ni, Pt, Ir) formation in the FZ, resulting in crack propagation within the M<sub>3</sub>Ti. In contrast, the 300 μm offset on the NiTi side inhibited the M<sub>3</sub>Ti formation by mitigating Pt and Ir dissolution into the FZ. Laser offset on the NiTi side can be an attractive option to enhance the strength and ductility of NiTi and PtIr butt joints.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"918 ","pages":"Article 147451"},"PeriodicalIF":6.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142537027","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
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