Materials Science and Engineering: A最新文献

{"title":"Effect of hatching distance and scanning path on MgAl2O4/Ti6Al4V joint by femtosecond laser welding: Microstructure, mechanical properties and residual stress","authors":"Hao Jiang ,&nbsp;Chun Li ,&nbsp;Xiaojian Mao ,&nbsp;Wendi Zhao ,&nbsp;Ningce Wei ,&nbsp;Xiaoqing Si ,&nbsp;Junlei Qi ,&nbsp;Jian Cao","doi":"10.1016/j.msea.2025.148505","DOIUrl":"10.1016/j.msea.2025.148505","url":null,"abstract":"<div><div>The effect of hatching distance and scanning path on the microstructure and mechanical properties of MgAl₂O₄/Ti6Al4V joint has been elucidated. In our research, three kinds of scanning paths (serpentine, fillet-serpentine and concentric circle) and five hatching distances are adopted. Direct bonding of the concentric circle welding seam with the hatching distance of 0.025 mm by femtosecond laser showed the highest shear strength, which can reach 27.56 MPa. Nondestructive residual stress measurement by Raman spectra has been taken in this study, and the joint with concentric circle welding line possessed the minimum stress value of 22.83 MPa, which is consistent with the trend of the shear strength.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148505"},"PeriodicalIF":6.1,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099012","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}

{"title":"The cyclic deterioration mechanisms of AlxCoCrFeNi high-entropy alloys","authors":"Rong Luo ,&nbsp;Bing Wang ,&nbsp;Peng Hua ,&nbsp;Jianhua Shen ,&nbsp;Chao Yu ,&nbsp;Guoqiang Li ,&nbsp;Bin Gu","doi":"10.1016/j.msea.2025.148507","DOIUrl":"10.1016/j.msea.2025.148507","url":null,"abstract":"<div><div>This study delves into the cyclic deterioration mechanisms of Al_<em>x</em>CoCrFeNi high-entropy alloys (HEAs) under cyclic nanoindentation by examining the evolution of mechanical properties, surface morphology and microstructures. With the increase of aluminum content, different deformation mechanisms are found responsible for the cyclic softening deterioration behavior and the hardness enhancement in these HEAs. For Al_0.1CoCrFeNi and Al_0.3CoCrFeNi HEAs, the cyclic softening behavior is attributed to dislocation planar slipping, stacking faults, deformation twinning and phase transformations from FCC phase to BCC and HCP phases. Al_0.5CoCrFeNi HEA exhibits compound regional deterioration, with the BCC-phase region dominated by dislocation-dominated plasticity and the FCC-phase region dominated by the synergistic effects of stacking faults and deformation twinning, which undergoes phase transformations from FCC and BCC phases to HCP phase. The cyclic deterioration in AlCoCrFeNi HEA involves dislocation-dominated plasticity, stacking faults and phase transformation from BCC phase to HCP phase. Moreover, slip lines and pile-ups are observed only in Al_0.1CoCrFeNi HEA due to the low hardness and Al_0.5CoCrFeNi HEA due to incompatible deformation caused by dual-phase microstructure. The critical role of aluminum content in governing phase composition, plastic deformation mechanisms and mechanical properties is highlighted, with profound implications for designing high-performance HEAs.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148507"},"PeriodicalIF":6.1,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099114","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}

{"title":"The influence of intergranular misorientation on the deformation mechanisms and mechanical properties of pure magnesium","authors":"Tianjiao Li ,&nbsp;Qiyang He ,&nbsp;Qinrui Zhang ,&nbsp;Liuyong He ,&nbsp;Wenhuan Chen ,&nbsp;Shuaishuai Liu ,&nbsp;Jingyu Zhang ,&nbsp;Jiang Zheng ,&nbsp;Bin Jiang ,&nbsp;Manoj Gupta","doi":"10.1016/j.msea.2025.148502","DOIUrl":"10.1016/j.msea.2025.148502","url":null,"abstract":"<div><div>Grain orientation and intergranular misorientation are two key factors affecting the deformation behavior of magnesium (Mg). Previous extensive studies have proven that grain orientation determines the magnitude of the resolved shear stress of external loading acting on grains. However, the influence of intergranular misorientation on the deformation mechanisms and mechanical properties of Mg is still unclear. In this work, the Mg-sheet and Mg-rod with similar grain size but distinct intergranular misorientation distribution were selected as the study materials. The identical loading path, tension perpendicular to the c-axis of most grains, was applied to them. However, they showed similar yield strength but distinct ductility. The elongation of the Mg-rod was almost three times that of the Mg-sheet. Statistical slip trace analysis indicated prismatic slip and pyramidal slip exhibited much higher activity in the Mg-rod. The quantitative relationship between the geometric compatibility factor (m’) for various slip transfer types and the grain boundary misorientation angle (GBMA) has been established. It indicated (32°∼72°) and (72°∼90°) GBMA were in favor of the activation of pyramidal slip and prismatic slip, respectively. Accordingly, the uniform distribution of GBMA in the Mg-rod is the key factor for the higher activity of non-basal slip while GBMA clustering at (10°∼32°) in the Mg-sheet is not conducive to the startup of non-basal slip. The higher activity of non-basal slip results in the significantly superior ductility of the Mg-rod. The similar Schmid factor (SF) values for various deformation mechanisms keep the strength of the Mg-rod comparable to the Mg-sheet. Accordingly, tailoring intergranular misorientation can serve as a novel design concept for developing high-strength and high-ductility Mg alloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148502"},"PeriodicalIF":6.1,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099570","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}

{"title":"Additive manufacturing of strong and ductile In939+TiB2 by laser powder bed fusion","authors":"Jong-Soo Bae ,&nbsp;Emre Tekoglu ,&nbsp;Mohammed Alrizqi ,&nbsp;Alexander D. O'Brien ,&nbsp;Jian Liu ,&nbsp;Krista Biggs ,&nbsp;So Yeon Kim ,&nbsp;Aubrey Penn ,&nbsp;Ivo Sulak ,&nbsp;Wen Chen ,&nbsp;Kang Pyo So ,&nbsp;A. John Hart ,&nbsp;Gi-Dong Sim ,&nbsp;Ju Li","doi":"10.1016/j.msea.2025.148446","DOIUrl":"10.1016/j.msea.2025.148446","url":null,"abstract":"<div><div>Improving the printability and high-temperature mechanical performance of high aluminum and titanium content Inconel superalloys is of interest in aerospace, automotive, and energy industries. In aerospace applications, for instance, components such as turbine blades and engine parts require exceptional strength and ductility under extreme temperatures (above 800 °C), which more common Inconel alloys such as In718 and In625 struggle to provide. Therefore, this study explores the influence of TiB₂ on the additive manufacturing of Inconel 939 superalloy (In939) by laser powder bed fusion (LPBF). TiB₂ powders with a size of approximately 1–3 μm were decorated on the surfaces of Inconel 939 alloy powders via high-speed blending. Both pure In939 and In939+TiB₂ samples were prepared by LPBF with varying laser power and scanning speed. Microstructural analysis of the as-printed specimens revealed that the TiB₂ addition to Inconel 939 eliminated crack formation under all LPBF conditions tested. Consequently, the as-printed In939+TiB₂ exhibited superior room temperature (RT) yield strength (1256 MPa) and ultimate tensile strength (1578 MPa) with reasonable tensile ductility (13–15 %) compared to the as-printed In939. Furthermore, In939+TiB₂ shows exceptional high-temperature strength, demonstrating superior performance up to 850°C in contrast to other additively manufactured and cast In939 materials in the literature. This study paves the way for sectors including aerospace, automotive, and energy to significantly enhance the performance of critical components like turbine blades and engine parts made of In939 through LPBF.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148446"},"PeriodicalIF":6.1,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099111","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}

{"title":"Achieving excellent plasticity performance in non-equiatomic FCC CoCrFeNiMoMn high-entropy alloys via arc-based direct energy deposition","authors":"Fissha Biruke Teshome ,&nbsp;Miao Zhao ,&nbsp;Jiajia Shen ,&nbsp;J.P. Oliveira ,&nbsp;Chen Long ,&nbsp;Jian Li ,&nbsp;Bei Peng ,&nbsp;Zhi Zeng","doi":"10.1016/j.msea.2025.148501","DOIUrl":"10.1016/j.msea.2025.148501","url":null,"abstract":"<div><div>High-entropy alloys (HEAs) are a relatively new class of materials with exceptional properties, offering promising applications in aerospace, nuclear industry, and hydrogen storage. Alongside alloy design and development, recent research on HEAs has focused on exploring different manufacturing processes and resulting properties. This study demonstrates the practicality of leveraging an ultra-high-frequency Tungsten Inert Gas (TIG)- heat source during directed energy deposition (DED) with dual alloy wires, to fabricate non-equiatomic CoCrFeNiMoMn HEAs for the first time. A comprehensive analysis of the microstructural evolution and mechanical properties of as-deposited HEAs and those post-heat treated based on CALPHAD methodology is detailed. The microstructural and elemental homogeneity was markedly enhanced through the application of ultra-high-frequency pulsed current (UHFPC), yielding a non-equiatomic CoCrFeNiMoMn alloy with a ductile FCC matrix in the as-deposited state. In the post-heat treatment condition, the FCC matrix underwent recrystallization and L2₁ phase precipitated at grain interiors and boundaries. These precipitates conferred significant strength to the HEA through precipitation hardening by effectively obstructing dislocation motion at incoherent interfaces, while the accompanying lattice misfit and dislocation networks further amplified the alloy's mechanical properties. The CALPHAD-guided heat treatment protocol notably elevated the performance metrics, achieving a 54.2 % enhancement in yield strength and a 42 % improvement in ultimate tensile strength, all while retaining commendable elongation. This work offers valuable insights into the potential of cost-effective TIG-based dual wire DED for the fabrication of HEAs with precisely tailored microstructures and properties, rendering them ideal for advanced applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148501"},"PeriodicalIF":6.1,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099433","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}

{"title":"Hierarchically microstructure endowing high strength-ductility synergy in CoCrNi medium entropy alloy fabricated by laser powder bed fusion","authors":"Haozhou Tang ,&nbsp;Pengda Niu ,&nbsp;Jingtao Kang ,&nbsp;Ruidi Li ,&nbsp;Tiechui Yuan","doi":"10.1016/j.msea.2025.148506","DOIUrl":"10.1016/j.msea.2025.148506","url":null,"abstract":"<div><div>CoCrNi medium entropy alloy (MEA) demonstrates considerable potential for structural engineering applications due to its exceptional mechanical properties. However, conventional processing techniques to achieve these properties are often constrained by inefficiency and prolonged processing times. Laser powder bed fusion (LPBF), an additive manufacturing (AM) technology, provides a promising alternative by enabling high processing flexibility and eliminating the requirement for intricate post-processing steps. This study investigates the microstructure, mechanical properties, and deformation mechanisms of LPBF-fabricated equimolar CoCrNi MEA with/without hot isostatic pressing (HIP). The as-printed MEA exhibits a single-phase FCC structure featuring hierarchical microstructures comprising columnar/equiaxed grains and dislocation-dominated sub-structure. Mechanical testing reveals anisotropic behavior, with horizontal specimens demonstrating yield strength of 673.3 MPa and elongation of 26.7 %, while vertical counterparts show 654.7 MPa and 41.6 %, respectively. Post-HIP treatment significantly enhances ductility to 85 % elongation without compromising ultimate strength. Deformation microstructural analysis indicates that the strength-ductility originates from synergistic interactions between dislocation slip, stacking faults (SFs), Lomer-Cottrell (L-C) locks, twin-induced plasticity (TWIP), and transformation induced plasticity (TRIP) effects. In contrast, HIP-processed specimens exhibit defect reduction and modified deformation mechanisms: dislocation-dominated plasticity at low strains transitions to coupled deformation twinning and dislocation interactions at higher strains. The exceptional strain hardening capacity of HIP-treated specimens is attributed to defect annihilation and optimized deformation pathway activation. This work provides critical insights into tailoring deformation mechanisms in advanced MEA systems via additive manufacturing and post-processing optimization.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"940 ","pages":"Article 148506"},"PeriodicalIF":6.1,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107988","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}

{"title":"Effect of Er addition on recrystallization, texture, and mechanical properties in a binary Mg-Er alloy","authors":"Rashi Rajanna ,&nbsp;Ishwar Kapoor ,&nbsp;V. Tiwari ,&nbsp;Soo Yeol Lee ,&nbsp;Sudhanshu S. Singh ,&nbsp;Jayant Jain","doi":"10.1016/j.msea.2025.148489","DOIUrl":"10.1016/j.msea.2025.148489","url":null,"abstract":"<div><div>In this work, the role of Er addition on texture, recrystallization and mechanical properties has been systematically studied in a binary Mg-Er alloy. As-cast Mg-1Er and Mg-5Er (wt. %) alloys were hot-rolled and annealed at 400 °C for different durations from 3 min to 60 min. The evolution of microstructure and texture were studied using electron back-scattered diffraction (EBSD), high resolution transmission electron microscopy (HRTEM) and X-Ray diffraction. Recrystallization kinetics were analyzed using combined hardness measurements and Johnson-Mehl-Avrami-Kolmogorov (JMAK) model. Additionally, tensile testing was conducted on hot-rolled and recrystallized samples. Er addition significantly influenced the propensity of twinning. It was observed that the addition of Er increased the proportion of contraction twins (CT) and double twins (DT) but lowered the extension twin (ET). Similarly, both as-rolled and recrystallized textures were influenced by Er addition. Increasing Er content reduced basal texture intensity. Quantitative assessment of recrystallization fraction suggested that Er addition lowers the recrystallization kinetics in Mg-Er alloys. The mechanical properties were superior in Mg-5Er alloys in both hot-rolled and annealed samples. Among several factors, the influence of Er addition on deformation mechanisms, solid solution strengthening, and solute drag effect seems to play a dominant role in explaining the results.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148489"},"PeriodicalIF":6.1,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099438","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}

{"title":"Strength-plasticity synergy of deformed Ti2AlC particles in aluminum matrix composites via interlayer slip","authors":"Yue Sun ,&nbsp;Gaohui Wu","doi":"10.1016/j.msea.2025.148488","DOIUrl":"10.1016/j.msea.2025.148488","url":null,"abstract":"<div><div>In this study, we focus on clarifying the synergistic mechanism of strength and plasticity of deformed particles on aluminum matrix composites. Ti₂AlC reinforcement was selected to prepare deformed particle reinforced composites with different contents by spark plasma sintering and hot extrusion process. The composite with preferred orientation and optimal addition of Ti₂AlC particles demonstrates a tensile strength of 252 MPa with 15 % tensile strain, showing a good balance of strength and plasticity. The Kernel Average Misorientation (KAM) maps obtained by Electron Backscatter Diffraction (EBSD) analysis shows that high-angle misorientation is mainly distributed inside the Ti₂AlC, indicating that the deformation is concentrated in the particles. With the increase of particle content, the geometrically necessary dislocation (GND) density estimated by the KAM values gradually increases, revealing that deformation of particles promotes dislocation strengthening. The deformed surface morphology reveals that the Ti₂AlC particle is mainly deformed by interlayer sliding, and the texture of Ti₂AlC has a close influence on the particle fracture behavior. In addition, the strengthening mechanisms of load transfer, grain refinement and dislocation are discussed for composites under different volume fractions to analyze the improvement of yield strength. The results demonstrate that dislocation strengthening caused by particle deformation dominates at low content, and the effect of grain refinement strengthening becomes equally significant at high content. The strength-plasticity synergistic effect of composites mainly makes full use of the deformation ability of Ti₂AlC particles and promotes the synergistic effect of multiple strengthening mechanisms.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148488"},"PeriodicalIF":6.1,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068313","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}

{"title":"Excellent dynamic yield and spall strength of single crystal NiAlCo alloy under shock compression","authors":"X.T. Pan ,&nbsp;J.L. Dong ,&nbsp;X.M. Chen ,&nbsp;B.Q. Luo ,&nbsp;R.J. Shui ,&nbsp;C. Xu ,&nbsp;G. Wu ,&nbsp;G.J. Wang ,&nbsp;H.A. Wu ,&nbsp;F.L. Tan ,&nbsp;J.H. Zhao ,&nbsp;C.W. Sun","doi":"10.1016/j.msea.2025.148487","DOIUrl":"10.1016/j.msea.2025.148487","url":null,"abstract":"<div><div>A fundamental understanding of the mechanical behaviors and deformation mechanism of materials subjected to dynamic loading is critical for developing outstanding structural materials. This work focuses on the experimental investigation into the dynamic mechanical behaviors, deformation mechanisms, and damage characteristics of single-crystal NiAlCo which was regarded as a potential structure material at high pressure and strain rate. The shock responses of the single-crystal NiAlCo alloy were tested over a range of shock pressure from 10 to 50 GPa at a strain rate of 10⁵/s utilizing the technique of magnetically driven high-velocity flyer plates on high pulsed power generator CQ-4. Based on the analyses of free surface velocity profiles, a linear Hugoniot relationship between shock wave speed and particle velocity was obtained, and the spall strength gradually increased from 2.61 GPa to 6.98 GPa with increasing shock pressure. The yield strength was calculated from the Hugoniot elastic limit, and it reaches 1.80 GPa over the wide range of shock pressure. Further, the relationship between dynamic strength and strain rate was depicted by empirical formulas in power exponential form. Finally, the detailed transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) microscopic characterization results of recovered samples disclose that single-crystal NiAlCo have abundant micro-deformation mechanisms under high pressure and high strain rate, including dislocation tangle, high-density stacking faults, and Lomer-Cottrell locks. The results show that both spall and yield strength are significantly higher than those of most alloys, exhibiting superior mechanical properties, which may be attributed to the coupling of multiple deformation mechanisms.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148487"},"PeriodicalIF":6.1,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099113","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}

{"title":"Heterostructured AlCoCrFeNi2.1 high entropy alloy with simultaneously improved strength and ductility via laser powder bed fusion","authors":"Yuang Dong,&nbsp;Jingxiang Lu,&nbsp;Siyu Yan,&nbsp;Xinqiang Lan,&nbsp;Zemin Wang","doi":"10.1016/j.msea.2025.148496","DOIUrl":"10.1016/j.msea.2025.148496","url":null,"abstract":"<div><div>Heterostructure has been evidenced to generate back stress-induced strengthening during deformation and can overcome the strength-ductility trade-off of the material. However, the advantage of additive manufacturing (AM) technology in freely tailoring local material properties has not been fully exploited in the preparation of heterostructured (HS) materials. In this work, we demonstrate changing the scanning mode of laser powder bed fusion (LPBF) to create heterogeneous regions, thereby successfully preparing AlCoCrFeNi_2.1 eutectic high entropy alloy (EHEA) with a layered heterostructure. The results show that by controlling the laser scanning mode, the phase distribution and grain size can be regulated, enabling the fabrication of soft and hard regions. The layered HS material, formed by combining the soft and hard regions, exhibits superior mechanical properties (the yield strength, ultimate tensile strength, and elongation are 1032 ± 22.6 MPa, 1310 ± 26.3 MPa, and 18.7 ± 0.8 %, respectively), representing improvements of 13.9 %, 5.9 %, and 8.7 % compared to the non-HS samples. The simultaneous enhancement in strength and ductility of this layered HS material is mainly due to the back stress-induced strengthening from the high-density interfaces of the heterogeneous regions during deformation. These results promote the development of high-performance materials with free-designed heterostructures fabricated by LPBF.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148496"},"PeriodicalIF":6.1,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099066","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}