Journal of Materials Research and Technology-Jmr&t最新文献

{"title":"Effect of impurity elements on the corrosion behavior of Mg-Al alloys: A first principles study","authors":"Tao Chen ,&nbsp;Yunxuan Zhou ,&nbsp;Shijun Tong ,&nbsp;Yulin Zhang ,&nbsp;Yuan Yuan ,&nbsp;Xianhua Chen ,&nbsp;Fusheng Pan","doi":"10.1016/j.jmrt.2025.05.078","DOIUrl":"10.1016/j.jmrt.2025.05.078","url":null,"abstract":"<div><div>Magnesium-aluminum (Mg-Al) alloys are promising lightweight materials but are prone to severe corrosion induced by trace impurities (Fe, Ni, Cu) even at ppm levels. This study systematically investigated the corrosion mechanisms of impurity-containing second phases in Mg-Al alloys using first-principles calculations. The work functions and surface energies of impurity-induced phases (Bcc(Al,Fe), Al₁₃Fe₄, Mg₂Ni, Mg₂Cu) and common phases (Mg₁₇Al₁₂, Al₈Mn₅, Al₁₁Mn₄) were calculated. Results reveal that all impurity phases exhibit higher average work functions (Φ) than α-Mg, acting as cathodic sites to drive micro-galvanic corrosion. The maximum work function hierarchy follows: Bcc(Al,Fe) &gt; Al₈Mn₅ &gt; Mg₂Ni &gt; Mg₁₇Al₁₂&gt; Mg₂Cu. Mn substitution in Fe-containing phases reduces their cathodic activity by lowering work function disparities. Notably, the corrosion effect of impurities may also be affected by the inversion of electrochemical nobility. This study establishes a direct correlation between electronic work function differences and corrosion susceptibility, providing atomic-scale insights for designing high-purity Mg-Al alloys through impurity control strategies.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 8632-8642"},"PeriodicalIF":6.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099231","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 reduced ambient pressure on weld formability, microstructure and corrosion behaviors in laser beam welding of zirconium alloy","authors":"Lianfeng Wei ,&nbsp;Yumo Jiang ,&nbsp;Di Xie ,&nbsp;Yong Zheng ,&nbsp;Shengkui Zhang ,&nbsp;Peicheng Lin ,&nbsp;Meng Jiang ,&nbsp;Xi Chen ,&nbsp;Peng He ,&nbsp;Yanbin Chen","doi":"10.1016/j.jmrt.2025.05.138","DOIUrl":"10.1016/j.jmrt.2025.05.138","url":null,"abstract":"<div><div>Welding zirconium alloys is a critical challenge in the nuclear industry owing to their high sensitivity to hydrogen and oxygen at high temperatures. This study explored the feasibility of vacuum laser welding as an alternative to conventional electron beam welding. The effects of reduced ambient pressure on weld formability, microstructure, and corrosion behavior were investigated. The results indicated a significant increase in the weld penetration depth and aspect ratio as the ambient pressure decreased from 101 kPa to 0.1 kPa. Low-vacuum conditions produced sound welds with improved surface quality and high aspect ratios. The molten pool and keyhole behaviors at different ambient pressures were experimentally and theoretically studied. The results revealed that a reduced ambient pressure transformed the welding process from thermal conductivity welding to deep keyhole welding. A larger molten pool and stable keyhole were observed in low vacuum, whereas atmospheric conditions resulted in a smaller molten pool obscured by bright plasma plumes. Microstructural analysis of welds under atmospheric and low-vacuum conditions revealed the growth of columnar crystals from both sides toward the center. Moreover, larger equiaxed crystals were observed in vacuum-welded joints owing to prolonged exposure to high temperatures, resulting from the increased heat input under low-vacuum conditions. A high-temperature, high-pressure corrosion test demonstrated that oxide film thickness gradually decreased with decreasing environmental pressure. The weld produced at 0.1 kPa exhibited excellent corrosion resistance, forming a black oxide film with good adhesion. This oxide film enhances the corrosion resistance of the weld, making it suitable for nuclear applications.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 9369-9377"},"PeriodicalIF":6.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130797","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":"Numerical simulation of local cooling on residual stress and deformation of welded joints of unequal thickness plates","authors":"Yang He ,&nbsp;Zhidong Yang ,&nbsp;Dongdong Yang ,&nbsp;Ruihai Duan ,&nbsp;Jiangmin Xu ,&nbsp;Wenqin Wang ,&nbsp;Mingxiao Shi ,&nbsp;Guoxiang Xu ,&nbsp;Shujin Chen","doi":"10.1016/j.jmrt.2025.05.057","DOIUrl":"10.1016/j.jmrt.2025.05.057","url":null,"abstract":"<div><div>To address the significant variations in stress distribution and welding deformation of unequal thickness plate welded joints, this study investigates the effect of local cooling on residual stress and welding deformation through experiments and numerical simulations. A three-dimensional thermo-elasto-plastic finite element model was developed and validated against temperature field measurements and weld cross-sectional profiles. Comparative analyses of simulated and experimentally measured welding stresses and deformations reveal that local cooling significantly reduces tensile stress in the weld zone while promoting a more uniform stress distribution in the heat-affected zone. The implementation of local cooling on the thin plate expands the regions of compressive stress at both ends of the weld and increases transverse tensile stress near the weld and within the cooled zone. Compared to the non-cooled condition, the treated specimens exhibit markedly improved welding stress distribution and reduced deformation. Angular distortion decreases by 18 % on the thin-plate side and 26.7 % on the thick-plate side, concurrently suppressing buckling deformation. These findings demonstrate that local cooling not only enhances deformation resistance in unequal thickness welded joints but also favorably modifies the magnitude and distribution patterns of welding stress. This study provides theoretical and technical guidance for controlling stress and deformation in unequal thickness plate welded joints.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 8410-8420"},"PeriodicalIF":6.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084241","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":"A multi-component diffusion multiple approach based synergistic regulation of γ' phase stability and mechanical properties in CoTiVNi-based superalloys","authors":"J.J. Ruan ,&nbsp;H.C. Sun ,&nbsp;J.S. Yan ,&nbsp;S. Yang ,&nbsp;Y. Li ,&nbsp;Z.W. Zhang ,&nbsp;L.L. Zhu ,&nbsp;H. Zhang ,&nbsp;N. Ueshima ,&nbsp;K. Oikawa ,&nbsp;L. Jiang","doi":"10.1016/j.jmrt.2025.05.172","DOIUrl":"10.1016/j.jmrt.2025.05.172","url":null,"abstract":"<div><div>Enhanced fuel efficiency and engine performance have driven interest in Co-based superalloys reinforced by coherent γ′ dispersed in the matrix with low stacking fault energy (SFE). However, poor microstructure stability due to thermodynamically unstable γ′ phases limits their application. A (multi-component diffusion multiple) MCDM approach was employed to efficiently explore composition-microstructure-property relationships of the novel Co–Ti–V–Ni alloys in the present work. Two alloy groups (A: high Ni, B: low Ni) with varying V/Ti ratios were designed, homogenized, and analyzed via EPMA, FE-SEM, in situ XRD, TEM, and mechanical testing. Results revealed that γ′ phase stability decreased with increasing Ni, contrasting prior studies where Ni improved γ′ stability in Al-containing systems. In situ XRD demonstrated temperature-dependent γ/γ′ lattice misfit, with Group A exhibiting higher misfits than Group B, and the lattice misfit decreased with rising V/Ti ratio. Alloy 4# showed anomalous strength increase at 750 °C, attributed to dislocation cross-slip. The deformation mechanisms of the alloy exhibit a temperature-dependent evolution: at room temperature, the matrix primarily undergoes deformation through SFs, Lomer-Cottrell locks (LCs), and HCP phase formation. As the temperature increases to 750 °C, deformation twins progressively dominate in the matrix. However, upon further heating to 800 °C, the deformation behavior reverts to a combination of SFs and LC locks as the primary mechanisms. SFE calculations indicated a high-temperature chemical segregation-assisted SF formation. This work highlights the efficiency of MCDM in alloy design and underscores the prominent roles of V in optimizing Co-based superalloys, providing insights for future development of thermally stable, high-performance materials.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 9539-9548"},"PeriodicalIF":6.2,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134284","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":"Enhanced dissimilar aluminum alloy joints using 0.1 mm offset in refill friction stir spot welding","authors":"José Francisco Caldeira Maranho ,&nbsp;Fan Cui ,&nbsp;Huawei Tang ,&nbsp;Xiaosong Feng ,&nbsp;Hao Luan ,&nbsp;Junjun Shen ,&nbsp;Witor Wolf ,&nbsp;Brenda Juliet Martins Freitas ,&nbsp;Wenya Li ,&nbsp;Nelson Guedes de Alcântara ,&nbsp;Jorge Fernandez dos Santos ,&nbsp;Benjamin Klusemann ,&nbsp;Guilherme Yuuki Koga","doi":"10.1016/j.jmrt.2025.03.200","DOIUrl":"10.1016/j.jmrt.2025.03.200","url":null,"abstract":"<div><div>5A06-O and 2219-T87 aluminum alloys are promising candidates for propellant tanks. In this study, refill friction stir spot welding (refill FSSW) with a 0.1 mm offset was applied to produce defect-free 5A06-O/2219-T87 welds. A Box-Behnken method and statistical analysis were used to optimize the processing parameters, by determining the influence of welding parameters on lap shear strength (LSS). Plunge depth was the most influential parameter on LSS. All joints failed through the weld seam, including those tested at −55 °C. Microhardness measurements showed a slight increase in the 5A06 sheet over time, while the 2219 sheet exhibited significant hardness reduction. Microstructural analysis revealed typical features of refill FSSW, including a heat-affected zone, thermo-mechanically affected zone, stir zone, hook, and joint-line remnants. Novel findings include the identification of an onion structure in the welds, characterized by fine equiaxed grains and nanoprecipitates that contribute to weld's hardness. This unique microstructure, formed under the thermal and mechanical conditions of the FSSW process, strengthens the material and enhances its mechanical performance. Stop-action tests provided insights into material flow and microstructural evolution during welding. While conventional refill FSSW could not produce defect-free welds, the findings highlight the potential of the 0.1 mm offset refill FSSW to enhance weld quality, supporting its application in aerospace components requiring high mechanical integrity across extreme temperature ranges.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 1091-1104"},"PeriodicalIF":6.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680301","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}

{"title":"Correlation between microstructures and mechanical properties of super-sized new-energy automobile structural component formed by vacuum HPDC process","authors":"Minjie Huang ,&nbsp;Jufu Jiang ,&nbsp;Ying Wang ,&nbsp;Tianxiang Qin ,&nbsp;Xiaodong Zhang ,&nbsp;Jian Dong ,&nbsp;Jingbo Cui ,&nbsp;Lingbo Kong ,&nbsp;Chenggang Wang","doi":"10.1016/j.jmrt.2025.03.198","DOIUrl":"10.1016/j.jmrt.2025.03.198","url":null,"abstract":"<div><div>Correlation between microstructures and mechanical properties of a super-sized new-energy automobile rear floor component (three-dimensional size: 1842 mm × 1549 mm × 741 mm, projected area: 2.85 m², largest projected area in available reports) manufactured by vacuum high-pressure die casting (HPDC) process using a non-heat treated aluminum alloy was clarified. Effects of filling behavior and solidification sequence during HPDC on microstructures and mechanical properties of various regions for the HPDC component were unraveled. According to filling and solidification characteristic, 5 regions of the HPDC component were selected for evaluation. Rear floor platform region exhibits high comprehensive mechanical properties. The yield strength (YS) and ultimate tensile strength (UTS) for various locations are higher than 146 MPa and 252 MPa, respectively, while average elongation (EL) reaches 8.60 %. High YS in this region is attributed to fine-grained structure formed at rapid solidification condition. Utilizing local loading and feeding strategy, fine and dense microstructure was successfully obtained in longitudinal beam region, which guarantees excellent strength and plasticity (UTS and EL near local loading and feeding area reach 226.86 MPa and 10.41 %). Low filling velocity in wheel housing region increases the residence time of the melt in die cavity and promotes nucleation and growth of Fe-rich phase, while sluggish solidification causes the further coarsening of Fe-rich phase, resulting in degradation of elongation. Agglomeration of grains under turbulent flow condition during die filling and slow cooling condition in horizontal support column region cause abnormal growth of externally solidified crystals (ESC) grains, which is detrimental to ductility.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 1146-1159"},"PeriodicalIF":6.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680310","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}

{"title":"Quantitative microstructural characterization–Based calculation of the relationship between regional yield strength and microstructure in back–Extruded Mg–Gd–Y–Zr alloy cups","authors":"Honggang Duan ,&nbsp;Yonghua Huang ,&nbsp;Xuemei Sun ,&nbsp;Xiaoyu Wang ,&nbsp;Xingrong Chu ,&nbsp;Wenke Wang ,&nbsp;Wenzhen Chen","doi":"10.1016/j.jmrt.2025.03.196","DOIUrl":"10.1016/j.jmrt.2025.03.196","url":null,"abstract":"<div><div>This study quantitatively investigates the relationship between regional yield strength and microstructure in Mg–9Gd–5Y–0.5Zr (wt.%) alloy cups formed by backward extrusion. A refined GM–HP model was developed, incorporating texture, grain boundary, and dislocation strengthening to accurately predict the compressive yield strength across different regions, accounting for microstructural heterogeneity. The microstructure exhibits significant diversity, driven by variations in the deformation path and dynamic recrystallization (DRX), transitioning from a mixed-grain microstructure with &lt;0001&gt;//ED texture to fully recrystallized fine grains in the corners, followed by grain coarsening in the walls. Microstructural analysis reveals that basal &lt;a&gt; slip is the predominant deformation mechanism, with prismatic &lt;a&gt; slip serving as a secondary contributor. The orientation factor <em>M</em>, strongly influenced by texture, reaches a maximum value of ∼3.3 under the &lt;0001&gt;⊥ED texture. Geometrically necessary dislocations (GNDs) exhibit an inverse correlation with DRX, with values ranging from 0.55 to 2.75 × 10¹⁴ m⁻². The GM–HP model reveals that grain boundary strengthening contributes 50–70 % of total yield strength, and highlights the significant hardening of &lt;0001&gt;⊥ED texture and GNDs. These findings provide valuable insights for optimizing the microstructural design and plastic deformation processing of magnesium alloy.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 1115-1123"},"PeriodicalIF":6.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680323","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}

{"title":"Softening suppression and property improvement by laser pretreatment of FSW AA6061 aluminum alloy","authors":"Ning Wang ,&nbsp;Chunzhi Zhang ,&nbsp;Dong Zhang ,&nbsp;Shufeng Zhao ,&nbsp;Qi Liu ,&nbsp;Lijun Zhang","doi":"10.1016/j.jmrt.2025.03.187","DOIUrl":"10.1016/j.jmrt.2025.03.187","url":null,"abstract":"<div><div>The thermal history associated with welding processes often leads to softening in aluminum alloys, negating their lightweight advantage. To counteract this, this study employs a novel pretreatment strategy using laser beam welding (LBW) prior to friction stir welding (FSW) in AA6061 aluminum alloy. The laser pretreatment, through its high energy density and rapid cooling, promotes grain refinement, creating a greater number of high-angle grain boundaries, and induces the precipitation of fine AlFeMnSi phases. This not only forms a more refined microstructure but also improves uniformity through recrystallization and precipitate pinning effects, which significantly enhances the strength and hardness of the FSW joints. Electron backscatter diffraction (EBSD) analysis revealed that the average grain size in the nugget zone of the pretreated FSW joint was 0.95 μm, which is 32.6 % smaller than the 1.41 μm observed in the conventional FSW joint. This investigation demonstrates an effective approach for achieving robust welds in aluminum alloys, potentially enhancing their application in various industries.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 1124-1129"},"PeriodicalIF":6.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680464","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}

{"title":"Development and characterization of minimal surface tantalum scaffold with high strength and superior fatigue resistance","authors":"Xiaojun Ni ,&nbsp;Qingbao Sun ,&nbsp;Jiaxiang Wang ,&nbsp;Dachen Zhang ,&nbsp;Xia Jin ,&nbsp;Qiang Yang ,&nbsp;Luyuan Chen ,&nbsp;Jingzhou Yang ,&nbsp;Yonglong Hong","doi":"10.1016/j.jmrt.2025.03.108","DOIUrl":"10.1016/j.jmrt.2025.03.108","url":null,"abstract":"<div><div>Additively manufactured tantalum scaffolds show great promise for load-bearing bone reconstruction due to their exceptional osseointegration and bone in-growth capabilities. Nonetheless, enhancing their mechanical properties, particularly fatigue resistance, remains a critical goal. This study highlights the remarkable mechanical properties of additively manufactured triple periodic minimal surface (TPMS) porous tantalum scaffolds. With a porosity of 70 %, the TPMS tantalum scaffold exhibits a compressive yield strength of 57.6 MPa, surpassing trabecular porous structures with identical porosity by over 70 % and the rhombic dodecahedron (RDOD) structure by over 30 %. Furthermore, its elastic modulus reaches 7.3 GPa, marking a 95 % increase compared to RDOD and trabecular tantalum scaffolds. Notably, this scaffold demonstrates impressive ductility, with no macroscopic brittle fractures even at a maximum strain of 50 %. During static compression, the tantalum scaffold structure showcases a layer-by-layer deformation failure mechanism, leading to a substantial rise in dislocation density and low-angle grain boundaries within the grain regions. This suggests that the failure mechanism primarily arises from plastic deformation and ductile fracture in tantalum materials. The TPMS tantalum scaffold displays excellent fatigue resistance without mechanical fracture failure, maintaining its residual compression yield strength post-testing, unlike the RDOD tantalum scaffold which experiences fatigue failure with a strength of 26 MPa. The TPMS porous structure exhibits superior stress distribution and reduced stress concentration compared to the RDOD design, resulting in enhanced mechanical performances. Given its exceptional mechanical properties, the TPMS tantalum scaffold holds significant potential for clinical applications as load-bearing bone implants.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 1226-1239"},"PeriodicalIF":6.2,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697271","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}

{"title":"Optimization of microstructure and properties of high-silicon aluminum alloys for electronic packaging based on semi-solid thixotropic forming process","authors":"Shenao Jiang ,&nbsp;Tao Jiang ,&nbsp;Wei Yu ,&nbsp;Yong Li ,&nbsp;Wanshun Zhang ,&nbsp;Yonghui Sun ,&nbsp;Hongyang Zhao","doi":"10.1016/j.jmrt.2025.03.194","DOIUrl":"10.1016/j.jmrt.2025.03.194","url":null,"abstract":"<div><div>This study utilizes a semi-solid thixotropic forming strategy to achieve plastic deformation of Al–50Si alloy, optimizing its microstructure and properties. Various techniques, including large-area EBSD stitching, SEM, nanoindentation, and hardness testing, are used to investigate the alloy's recrystallization behavior, texture evolution, and stress distribution. The results highlight the mechanisms responsible for the microstructural changes and the enhancement of mechanical properties. Following thixotropic forming, the coarse Si phases within the alloy are fragmented. The average size of the primary Si particles decreases from 122.88 μm to 17.33 μm, a reduction of 85.90 %. Due to the synergistic effects of multiple mechanisms during forming process, the alloy's hardness increases from 81.29 HV to 155.83 HV, a 91.70 % improvement. The effectiveness of the strengthening strategy is further confirmed through ROM and Turner model analyses. Overall, this study demonstrates the feasibility of applying semi-solid forming techniques to fabricate Al–50Si materials. Not only does this approach expand the processing window for high-silicon aluminum alloys, but it also offers new insights into optimizing the microstructure and properties of difficult-to-deform materials.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 1194-1201"},"PeriodicalIF":6.2,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680468","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}