Materials Science and Engineering: A最新文献_第2页

In situ synthesis of TiB2-NiTi-TiB2 sandwich structure for tailoring Ti2Ni to synergistically optimize strength, ductility, and superelasticity of NiTi wires 原位合成TiB2-NiTi-TiB2夹层结构，用于剪裁Ti2Ni，以协同优化NiTi丝的强度，延展性和超弹性

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-09-28 DOI: 10.1016/j.msea.2025.149199

Yang Zhao , Shubin Ren , Guangquan Qian , Qianyu Wang , Xinbin Hu

{"title":"In situ synthesis of TiB2-NiTi-TiB2 sandwich structure for tailoring Ti2Ni to synergistically optimize strength, ductility, and superelasticity of NiTi wires","authors":"Yang Zhao , Shubin Ren , Guangquan Qian , Qianyu Wang , Xinbin Hu","doi":"10.1016/j.msea.2025.149199","DOIUrl":"10.1016/j.msea.2025.149199","url":null,"abstract":"<div><div>The brittle Ti<sub>2</sub>Ni phase induces crack initiation and causes premature failure in NiTi alloys. This study demonstrates that introducing 0.2 wt% B element into NiTi alloy promotes in-situ formation of layered TiB<sub>2</sub>, forming a semi-coherent TiB<sub>2</sub>-NiTi-TiB<sub>2</sub> \"sandwich\" structure, which effectively suppresses the generation and growth of Ti<sub>2</sub>Ni particles at subsequent grain boundaries. The semi-coherent interface between TiB<sub>2</sub> and the matrix, bonded through stacking faults, significantly strengthens the NiTi alloy, allowing it to withstand greater stresses during the elastic deformation stage. Furthermore, this interface structure enhances the continuity of reverse martensitic transformation in alloy wires, mitigating local stress concentration and optimizing superelasticity while maintaining excellent ductility. However, excessive B (0.5 wt%) triggers detrimental blocky TiB<sub>2</sub> formation, exacerbating stress concentrations. These findings indicate that precise control of B addition can achieve ideal TiB<sub>2</sub>-Ti<sub>2</sub>Ni coupling, providing a novel strategy for synergistically enhancing strength, ductility, and superelasticity in NiTi wires.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149199"},"PeriodicalIF":7.0,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218897","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

High entropy design driven the strengthening and toughening of multi-scale gradient stainless steel joints 高熵设计驱动了多尺度梯度不锈钢接头的强化和增韧

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-09-28 DOI: 10.1016/j.msea.2025.149188

Zhen Li , Yingzhe Li , Wenshan Guo , Jianwei Dong , Qinglong Wu , Yang Yang , Zhen Luo

{"title":"High entropy design driven the strengthening and toughening of multi-scale gradient stainless steel joints","authors":"Zhen Li , Yingzhe Li , Wenshan Guo , Jianwei Dong , Qinglong Wu , Yang Yang , Zhen Luo","doi":"10.1016/j.msea.2025.149188","DOIUrl":"10.1016/j.msea.2025.149188","url":null,"abstract":"<div><div>The development of alloys with both high strength and ductility remains a critical challenge. Here, a multiscale gradient-structured joint was fabricated by combining alloying with a two-pass laser welding strategy based on additive manufacturing principles. Using AlCoCrNiCu<sub>0.5</sub>Ti<sub>x</sub> (x = 0.5, 1) high-entropy alloys with 304L stainless steel, the joint exhibited columnar–equiaxed–columnar grains and compositional heterogeneity arising from varied heat input and dilution. Ti enrichment in the second pass promoted an FCC-to-BCC transition, establishing a phase gradient across the weld. This architecture enabled a remarkable strength–ductility synergy, achieving a yield strength of 368.8 MPa, ultimate tensile strength of 741.3 MPa, and elongation of 75 %, surpassing conventional 304L welds. Fracture occurred in the base metal, with dimpled morphology confirming ductile failure. The superior performance stems from multi-mechanism strengthening, particularly back-stress hardening from geometrically necessary dislocations, together with enhanced strain-hardening capacity imparted by the gradient structure. By utilizing the spatial design flexibility of additive manufacturing, this work presents a novel strategy for fabricating multiscale gradient structures, offering a promising pathway toward advanced structural materials with exceptional mechanical synergy.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149188"},"PeriodicalIF":7.0,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218830","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

A novel hybrid forming process integrating friction stir welding pre-bonding and hot extrusion for fabrication of Mg/Al laminated composites 提出了一种搅拌摩擦焊预粘接与热挤压复合成形的镁铝复合材料新工艺

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-09-28 DOI: 10.1016/j.msea.2025.149184

Yuhong Sun , Shengli Tao , Junlei Zhang , Xiang Chen , Zulai Li , Lujian Cui , Linbing Deng , Guangsheng Huang

{"title":"A novel hybrid forming process integrating friction stir welding pre-bonding and hot extrusion for fabrication of Mg/Al laminated composites","authors":"Yuhong Sun , Shengli Tao , Junlei Zhang , Xiang Chen , Zulai Li , Lujian Cui , Linbing Deng , Guangsheng Huang","doi":"10.1016/j.msea.2025.149184","DOIUrl":"10.1016/j.msea.2025.149184","url":null,"abstract":"<div><div>In this study, multi-layered Mg/Al laminated composites were successfully fabricated using a combination of friction stir welding (FSW) pre-bonding and hot extrusion. The effects of initial stacking sequence (Mg-over-Al and Al-over-Mg) during FSW on interfacial microstructure evolution and mechanical properties were systematically investigated. Microstructure characterization indicated that the Mg/Al layers were primarily composed of fine and uniform equiaxed grains. The stacking sequence had a minimal effect on the texture intensity, grain size, and recrystallization degrees. However, the Mg-over-Al pre-bonding induced significant interfacial metal mixing, leading to the formation of Mg-Al intermetallic compounds (IMCs) inside the plate. In contrast, the Al-over-Mg stacking effectively confined IMCs formation. Mechanical testing results indicated that Al-over-Mg specimen exhibited superior comprehensive mechanical properties (yield strength (YS): 157 MPa, ultimate tensile strength (UTS): 250 MPa, elongation (EL): 9.1 %) compared to the Mg-over-Al configuration (YS:168 MPa, UTS: 183 MPa, EL: 3.4 %). The inferior ductility and strength of the latter were attributed to Mg-Al IMCs at the interface, which initiated cracks and caused premature failure. The marked strength-ductility trade-off highlights the critical influence of the stacking sequence on interfacial IMCs formation and mechanical performance.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149184"},"PeriodicalIF":7.0,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157202","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

Dynamic compression behavior and strengthening mechanisms of Nb-alloyed CoCrNi medium entropy alloys 铌化CoCrNi中熵合金的动态压缩行为及强化机理

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-09-27 DOI: 10.1016/j.msea.2025.149198

Yihuan Cao , Yuxian Cao , Yunwei Gui , Zihan Jia , Yingying Li , Qingsheng Liu , Huadong Fu

{"title":"Dynamic compression behavior and strengthening mechanisms of Nb-alloyed CoCrNi medium entropy alloys","authors":"Yihuan Cao , Yuxian Cao , Yunwei Gui , Zihan Jia , Yingying Li , Qingsheng Liu , Huadong Fu","doi":"10.1016/j.msea.2025.149198","DOIUrl":"10.1016/j.msea.2025.149198","url":null,"abstract":"<div><div>It is of substantial scientific significance and practical value to understand the mechanical properties and intrinsic mechanisms of medium-entropy alloys (MEAs) under high strain rates. This study systematically investigates Nb microalloying effects on the dynamic deformation behavior of CoCrNi MEAs, revealing Nb-dependent microstructural evolution and strengthening mechanisms. Nb addition induces multi-scale second phase formation accompanied by lattice expansion/distortion, effectively suppressing grain boundary mobility and dislocation annihilation during recrystallization. These coupled microstructural modifications lead to a significant enhancement in yield strength under high-strain-rate loading compared to Nb-free counterparts. Furthermore, the hierarchical strain accommodation mechanisms, encompassing dislocations, stacking faults, and deformation nanotwins, synergistically contribute to superior strain hardening. The research findings provide key theoretical and experimental support for the application of medium-entropy alloys under extreme dynamic loads.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149198"},"PeriodicalIF":7.0,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218739","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

Strain rate and temperature effects on dynamic behavior of LPBF-GH3230 superalloy 应变速率和温度对LPBF-GH3230高温合金动态行为的影响

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-09-27 DOI: 10.1016/j.msea.2025.149195

Yulin Qin , Wanqi Wu , Ningrui Wang , Wenhao Liu , Xiaoyi Wang , Hao Deng , Xiaochong Liang , Ling Wang , Shilei Li , Qungang Kong , Kai Sheng , Longqing Chen , Jun Zhu , Ming Yin

{"title":"Strain rate and temperature effects on dynamic behavior of LPBF-GH3230 superalloy","authors":"Yulin Qin , Wanqi Wu , Ningrui Wang , Wenhao Liu , Xiaoyi Wang , Hao Deng , Xiaochong Liang , Ling Wang , Shilei Li , Qungang Kong , Kai Sheng , Longqing Chen , Jun Zhu , Ming Yin","doi":"10.1016/j.msea.2025.149195","DOIUrl":"10.1016/j.msea.2025.149195","url":null,"abstract":"<div><div>This study investigates the dynamic compression behavior of laser powder bed fusion (LPBF)-processed Ni-based superalloy GH3230 across a wide range of strain rates (1482 - 6893 s<sup>−1</sup>) and temperatures (-150 - 750 °C) using a Split Hopkinson Pressure Bar (SHPB) system. The mechanical test results revealed that as the strain rate increased from 1482 s<sup>−1</sup> to 6893 s<sup>−1</sup>, the peak true stress increased from 895 MPa to 1853 MPa, with an increase of 107 %, exhibiting a significant strain rate strengthening effect. This phenomenon is mainly attributed to the enhanced dislocation interactions and reduced dynamic recovery capacity. Microstructural analysis demonstrates that increasing the strain rate promotes a transition from columnar to equiaxed grain morphology through dynamic recrystallization and grain fragmentation, reducing the average grain size from 35.7 μm to 2.36 μm. In contrast, temperature exerts a weaker influence on grain evolution: while thermal softening decreases peak stress at elevated temperatures, recrystallized fractions remain below 5 % across all tested temperatures due to the short deformation time in SHPB tests. EBSD-based texture analysis showed strain rate-induced weakening of the initial <001>//build direction (BD) texture and gradual orientation homogenization, accompanied by increased dislocation density and intragranular misorientation. These findings underscore the dominant role of strain rate in governing both the mechanical response and microstructural evolution, whereas temperature primarily affects deformation resistance through thermal activation.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149195"},"PeriodicalIF":7.0,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218835","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

Texture evolution and strengthening mechanism of single-crystal Cu-2wt%Ag alloy during continuous drawing 单晶Cu-2wt%Ag合金连续拉伸过程织构演变及强化机理

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-09-27 DOI: 10.1016/j.msea.2025.149202

Lin Qi , Wenbin Tian , Meiyuan Lv , Weihao Sun , Mingxin Duan , Jiajun Liu , Jiannan Sun , Yuge Bai , Yuping Ren , Hongxiao Li , Yandong Liu , Min Jiang , Gaowu Qin

{"title":"Texture evolution and strengthening mechanism of single-crystal Cu-2wt%Ag alloy during continuous drawing","authors":"Lin Qi , Wenbin Tian , Meiyuan Lv , Weihao Sun , Mingxin Duan , Jiajun Liu , Jiannan Sun , Yuge Bai , Yuping Ren , Hongxiao Li , Yandong Liu , Min Jiang , Gaowu Qin","doi":"10.1016/j.msea.2025.149202","DOIUrl":"10.1016/j.msea.2025.149202","url":null,"abstract":"<div><div>Ultrafine (30 μm diameter) Cu-2wt%Ag alloy wires were fabricated by cold drawing directionally solidified <111>-oriented single-crystal rods (φ6 mm) to a total deformation of 99.998 %. This study systematically investigates the evolution of texture, mechanical properties, and strengthening mechanisms, revealing significant heterogeneity in texture development across the wire's cross-section. The central region evolved from its initial <111> orientation to a dual <111>+<100> texture, with the <100> component arising from deformation band fragmentation. In contrast, the texture evolution in the edge region was more complex: at low deformation, deformation bands with <112> orientations formed with threefold rotational symmetry; at high deformation, these bands rotated to a <100> orientation, resulting in a final <111>+<100> texture. Concurrently, the matrix <111> component was stabilized via a <111>→<110>→<111> rotation path. The final 30 μm wire exhibited an excellent combination of high tensile strength (955.8 MPa) and good electrical conductivity (80.3 % IACS). Quantitative analysis identified grain boundary, dislocation, and texture strengthening as the primary strengthening mechanisms, while the proliferation of transverse grain boundaries was identified as the primary contributor to the increase in electrical resistivity.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149202"},"PeriodicalIF":7.0,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218449","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 low-carbon steel produced by WAAM with high deposition rate 高沉积速率WAAM低碳钢的组织与力学性能

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-09-27 DOI: 10.1016/j.msea.2025.149185

M. Klimova , K. Nasonovskiy , I. Astakhov , A. Fedoseeva , R. Korsmik , D. Mukin , S. Zherebtsov , N. Stepanov

{"title":"Microstructure and mechanical properties of low-carbon steel produced by WAAM with high deposition rate","authors":"M. Klimova , K. Nasonovskiy , I. Astakhov , A. Fedoseeva , R. Korsmik , D. Mukin , S. Zherebtsov , N. Stepanov","doi":"10.1016/j.msea.2025.149185","DOIUrl":"10.1016/j.msea.2025.149185","url":null,"abstract":"<div><div>Wire arc additive manufacturing (WAAM) has the capacity to create large-scale metallic components for various applications with high deposition rate and energy efficiency. However, high deposition rates with the large energy input are inevitably associated with deterioration of surface quality, formation of defects and coarsening of the microstructure, which negatively affects mechanical properties. In this study, the possibility of large-sized parts producing by WAAM technique with high performance using the proposed deposition strategy was demonstrated. To determine the effect of high deposition rate on the microstructure and mechanical behavior, bulk low-carbon steel samples with dimensions of 90 х 90 х 90 mm<sup>3</sup> was produced at high (10.3 kW) and low (2 kW) powers. The microstructure, consisting of (i) mixture of bainite/acicular ferrite (at 2 kW) or predominantly acicular ferrite (at 10.3 kW), (ii) allotriomorphic ferrite with (iii) carbides precipitation was observed. The size and volume fraction of phases, depending on process parameters and the thermal history during WAAM, defined the difference of the mechanical behavior. Although the high process power has resulted in some reduction in strength, namely the yield strength and ultimate tensile strength were 335 MPa and 560 MPa, respectively; the mechanical properties were comparable to those of mild steels, but produced by WAAM at significantly lower deposition rates. The microstructure formation mechanisms and relationships between microstructure and mechanical properties (e.g. strengthening mechanisms) were discussed.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149185"},"PeriodicalIF":7.0,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218839","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

Unravelling the mechanism of Ce microalloying on the mechanical properties of EH460 marine steel 揭示了Ce微合金化对EH460船用钢力学性能的影响机理

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-09-27 DOI: 10.1016/j.msea.2025.149186

Wenfeng Zeng , Chongqing Tan , Xiaoqiang Hu , Jiajun Cui , Zhigang Wang , Qian Wang , Dianzhong Li

{"title":"Unravelling the mechanism of Ce microalloying on the mechanical properties of EH460 marine steel","authors":"Wenfeng Zeng , Chongqing Tan , Xiaoqiang Hu , Jiajun Cui , Zhigang Wang , Qian Wang , Dianzhong Li","doi":"10.1016/j.msea.2025.149186","DOIUrl":"10.1016/j.msea.2025.149186","url":null,"abstract":"<div><div>The effect of Ce microalloying on the mechanical properties of EH460 marine steel (EH460) was systematically investigated through experimental characterization and first-principles calculations. The results demonstrate that the addition of trace Ce significantly enhances the ductility of EH460 steel, increasing its elongation from 26.7 % to 31.5 %, while maintaining the ultimate tensile strength at 629.6 ± 2.3 MPa. Although the pearlite content in Ce-microalloyed EH460 steel exhibits only a slight increase from 20.9 % to 25.6 %, Ce induces a notable transformation in pearlite morphology. Specifically, the banded pearlite structure evolves into degenerate pearlite, characterized by the fragmentation of continuous cementite layers and the formation of a predominant fraction (91.1 %) of short rod-like cementite. Furthermore, the number density of Ce-modified inclusions (primarily Ce-O-S type) increases from 11.2 mm<sup>−2</sup> to 28.5 mm<sup>−2</sup>, while their average size decreases significantly from 2.0 μm to 1.5 μm. First-principles calculations reveal that Ce segregation at grain boundaries (GBs) inhibits the segregation of C atoms to adjacent regions and elevates the diffusion energy barrier of C atoms near GBs from 1.25 eV to 2.39 eV. This indicates that Ce obstructs the long-range diffusion pathways of C atoms at GBs, thereby disrupting the formation of continuous cementite layers. The presence of short rod-like cementite and fine-sized inclusions reduces dislocation concentration, delays crack initiation, and enhances the uniform plastic deformation capability of EH460 steel. This gives EH460 steel superior resistance to the ratchet effect, providing a basis for designing offshore steel materials with higher safety margins.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149186"},"PeriodicalIF":7.0,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218829","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 mechanical properties of cold sprayed stainless steel SS304L on structural steel S355J0 冷喷涂不锈钢SS304L在结构钢S355J0上的组织演变及力学性能

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-09-27 DOI: 10.1016/j.msea.2025.149190

Yixun Wang , Bo Ching Wong , Cheng Zhang , Tak-Ming Chan , Seiichiro Tsutsumi , Robert Voyle

{"title":"Microstructure evolution and mechanical properties of cold sprayed stainless steel SS304L on structural steel S355J0","authors":"Yixun Wang , Bo Ching Wong , Cheng Zhang , Tak-Ming Chan , Seiichiro Tsutsumi , Robert Voyle","doi":"10.1016/j.msea.2025.149190","DOIUrl":"10.1016/j.msea.2025.149190","url":null,"abstract":"<div><div>Cold spray is a promising technology for manufacturing and repair of steel construction because of its low heat input and high efficiency. However, the unfavourable strength-ductility synergy is a critical challenge that prevents its further application. The present work aims to investigate the performance of stainless steel SS304L deposited on structural steel S355J0 by cold spray, considering the effects of particle velocity and post heat treatment. The dislocation evolution and recrystallisation behaviour of cold sprayed SS304L steel during the annealing were studied through a combination of grain misorientation mapping, dislocation density quantification and fracture mechanism analysis. The correlation between dislocation evolution, metallurgical bonding behaviour and mechanical properties was elucidated. The results suggest that the as-sprayed deposits show a brittle fracture with particle boundary failure. Annealing above the recrystallisation temperature can eliminate the dislocations and accelerate the interface diffusion of particles, thus achieving the improvement of strength-ductility synergy. The outcome of this study demonstrates the potential of cold spray as an alternative additive manufacturing or repair technology for steel construction.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149190"},"PeriodicalIF":7.0,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218836","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

Modification mechanism of Sm on the microstructure of Mg-8Al-0.3Zn alloy Sm对Mg-8Al-0.3Zn合金组织的变质机理

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-09-27 DOI: 10.1016/j.msea.2025.149165

Jun-Chen Chen , Mei-Xuan Li , Jin Xu , Cheng Wang , Yipeng Gao , Hui-Yuan Wang

{"title":"Modification mechanism of Sm on the microstructure of Mg-8Al-0.3Zn alloy","authors":"Jun-Chen Chen , Mei-Xuan Li , Jin Xu , Cheng Wang , Yipeng Gao , Hui-Yuan Wang","doi":"10.1016/j.msea.2025.149165","DOIUrl":"10.1016/j.msea.2025.149165","url":null,"abstract":"<div><div>A systematic investigation into the impact of samarium (Sm) addition (x = 0.2, 0.5, 1.0, 2.0, and 3.0 wt%) on the microstructure formation in a cast Mg-8Al-0.3Zn (wt.%, AZ80) alloy was performed and the modification mechanism was revealed. Adding 0.2 wt% Sm causes α-Mg grains coarsening (from ∼192 μm to ∼327 μm) due to phase transition from Al-Fe-C-O phase to Al-Fe-Sm-C-O phase, the latter showing weaker nucleation-promoting ability. The addition of 1.0 wt% Sm led to the concurrent refinement of both α-Mg grains and the β-Mg<sub>17</sub>Al<sub>12</sub> phases. The α-Mg grain size decreased to ∼105 μm and coarse β-Mg<sub>17</sub>Al<sub>12</sub> phases with continuous net-work structure were refined to fine discontinuous rod-like or spherical morphology. The reduced grain size is primarily ascribed to <em>in situ</em> formed Al<sub>2</sub>Sm phases that could serve as active nucleation sites for α-Mg. The notable β-Mg<sub>17</sub>Al<sub>12</sub> refinement is attributed to the formation of Al<sub>20</sub>Sm<sub>4</sub> phases, which promote the heterogeneous nucleation of β-Mg<sub>17</sub>Al<sub>12</sub>. After adding 1.0 wt% Sm, the alloy demonstrated superior mechanical properties, achieving the ultimate tensile strength (UTS) of ∼220 MPa and elongation to failure (EF) of ∼11 %, which is due to the significant concurrent refinement of both primary and eutectic phases. However, when the amount of Sm reached 2.0 or 3.0 wt%, the ductility was declined owing to the coarsening of the Al<sub>2</sub>Sm phase. This study could shed light on the design of strong and ductile Mg-Al alloys, especially with high Al content for lightweight structural material applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"947 ","pages":"Article 149165"},"PeriodicalIF":7.0,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218832","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