Materials Science and Engineering: A最新文献

Effect of La content on inclusions, grain refinement, and impact toughness in low alloy wear-resistant steel: in-situ tensile testing and EBSD orientation analysis of inclusions La含量对低合金耐磨钢中夹杂物、晶粒细化和冲击韧性的影响：原位拉伸试验和夹杂物的EBSD取向分析

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-31 DOI: 10.1016/j.msea.2025.148867

Haixiang Zheng , Shengchao Duan , Lifeng Zhang

{"title":"Effect of La content on inclusions, grain refinement, and impact toughness in low alloy wear-resistant steel: in-situ tensile testing and EBSD orientation analysis of inclusions","authors":"Haixiang Zheng , Shengchao Duan , Lifeng Zhang","doi":"10.1016/j.msea.2025.148867","DOIUrl":"10.1016/j.msea.2025.148867","url":null,"abstract":"<div><div>In the current study, the effects of varying La concentrations—specifically 0, 25, 40, and 96 ppm—on the feature of inclusions, the alteration of prior austenite grain size, and the impact toughness of the low alloy wear-resistant steel were systematically investigated. As the La content in the steel increased, the impact toughness first rose and then decreased, reaching a maximum of 76.83 J cm<sup>−2</sup> at 40 ppm La, with an increase of 19.6 %. The improvement in impact toughness primarily depended on the beneficial effects of La on inclusions and grain refinement. Adding La reduced the quantity of large non-metallic inclusions and the proportion of multiphase inclusions, which significantly improved the impact toughness. However, at 96 ppm La, the occurrence of large-sized La-O-P-As compromised impact toughness. With the increase in La content from 0 ppm to 96 ppm, the prior austenite grain size decreased, achieving the optimal refinement effect (from 14.18 μm to 9.94 μm) at 96 ppm. This is because the number of fine-dispersed inclusions (LaAlO<sub>3</sub> and La<sub>2</sub>O<sub>2</sub>S) that could act as nucleation sites increased significantly. EBSD showed that fine prior austenite grains were only present around the La<sub>2</sub>O<sub>2</sub>S (100), regardless of single-phase or multiphase inclusions. This indicated that if inclusions had planes with suitable planar disregistry matching the γ-Fe, they could serve as cores for heterogeneous nucleation. However, the ability of single-phase inclusions for heterogeneous nucleation was much higher than that of multiphase inclusions. The optimal performance was observed at 40 ppm La due to the ideal balance of inclusion type, size, and prior austenite grain refinement.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148867"},"PeriodicalIF":7.0,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144738010","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

Strengthening mechanisms of nanoprecipitates at elevated temperature in secondary hardening steel 二次硬化钢中纳米沉淀物的高温强化机制

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-29 DOI: 10.1016/j.msea.2025.148891

Yu Ji , Chao Yang , Tingting Xu , Chundong Hu , Han Dong

{"title":"Strengthening mechanisms of nanoprecipitates at elevated temperature in secondary hardening steel","authors":"Yu Ji , Chao Yang , Tingting Xu , Chundong Hu , Han Dong","doi":"10.1016/j.msea.2025.148891","DOIUrl":"10.1016/j.msea.2025.148891","url":null,"abstract":"<div><div>This study systematically investigated the effects of tempering temperature on the microstructural evolution, carbide precipitation behavior, and high-temperature mechanical properties of a newly developed 30Cr2Ni3Mo3V secondary hardening steel using SEM, TEM, XRD, and high-temperature tensile testing. The results show that the high-temperature strength initially increased and then decreased with increasing tempering temperature. The tensile strength reached a peak value of 405 MPa at 700 °C for samples tempered at 600 °C. When the tempering temperature was raised to 700 °C, carbides significantly coarsened, and the dislocation density decreased, resulting in a tensile strength drop to 338 MPa. During high-temperature tensile testing, the dispersed precipitation of nanoscale MC carbides (3–5 nm) effectively hindered dislocation motion via the Orowan mechanism, exhibiting superior thermal stability compared to M<sub>23</sub>C<sub>6</sub>. This study revealed that the high-temperature strength of 30Cr2Ni3Mo3V steel originates from the strengthening mechanism induced by the dispersion of nanoscale MC carbides during high-temperature deformation.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148891"},"PeriodicalIF":7.0,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144738023","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 remelting driven synergy of ordered precipitation strengthening and sub-grain structure for enhanced strength-toughness in K447A superalloy 激光重熔驱动有序析出强化与亚晶组织协同增强K447A高温合金的强度-韧性

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-29 DOI: 10.1016/j.msea.2025.148889

Qi Wei, Shangzhe Du, Qi Hu, Pulin Nie, Chengwu Yao, Jian Huang

{"title":"Laser remelting driven synergy of ordered precipitation strengthening and sub-grain structure for enhanced strength-toughness in K447A superalloy","authors":"Qi Wei, Shangzhe Du, Qi Hu, Pulin Nie, Chengwu Yao, Jian Huang","doi":"10.1016/j.msea.2025.148889","DOIUrl":"10.1016/j.msea.2025.148889","url":null,"abstract":"<div><div>This study investigated the laser surface remelting (LSR) of non-weldable K447A superalloy castings to repair damaged surfaces and enhance the mechanical properties of the remelted layers. The results indicated a significant improvement in hardness, room temperature, and 760 °C high-temperature tensile properties of the LSR layer. The LSR process reduced element segregation, allowing for increased solid solution of elements such as Al, Ti, and Ta. This led to an increase in the volume fraction of γ′ phase and the anti-phase boundary (APB) energy, resulting in a 37.7 % improvement in the yield strength of the LSR layer. During tensile deformation, the remelted structure more readily formed dislocation forest, causing local differences in strain hardening rates and inducing sub-grain formation. The sub-grain structure provided an additional mechanism for strain coordination, alleviating local stress concentration, thus improving toughness under 25 °C tensile conditions. At 760 °C, sub-grain boundaries underwent dynamic recrystallization driven by the combined effects of thermal activation and tensile stress, which reduced stress concentration by eliminating deformation energy, resulting in stress relaxation and thus enhancing the high-temperature tensile toughness of the LSR layer. During room temperature tensile, the interaction between dislocations and γ′ precipitates in the base material (BM) and LSR samples followed the APB strongly coupled dislocation shear mechanism. At 760 °C high-temperature tensile, the activation of more slip systems and the thermal activation of dislocations led to dislocation climb, cross-slip, Orowan bypass, and stacking fault shear mechanism, which dominated 760 °C high-temperature plastic deformation.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148889"},"PeriodicalIF":7.0,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724644","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 the ratio of CO2 in the shielding gas on the microstructure and mechanical properties of maraging steel fabricated by wire arc additive manufacturing 保护气体中CO2含量对电弧增材制造马氏体时效钢组织和力学性能的影响

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-28 DOI: 10.1016/j.msea.2025.148883

Chenyu Liu, Xiaoyong Zhang, Xiaotian Zhang, Zhen Wang, Ziyuan Chen, Wei Zhang, Qiangkun Wang, Pengfei Gao, Kehong Wang

{"title":"Effect of the ratio of CO2 in the shielding gas on the microstructure and mechanical properties of maraging steel fabricated by wire arc additive manufacturing","authors":"Chenyu Liu, Xiaoyong Zhang, Xiaotian Zhang, Zhen Wang, Ziyuan Chen, Wei Zhang, Qiangkun Wang, Pengfei Gao, Kehong Wang","doi":"10.1016/j.msea.2025.148883","DOIUrl":"10.1016/j.msea.2025.148883","url":null,"abstract":"<div><div>This study investigated the effect of the CO<sub>2</sub> ratio in shielding gas on the microstructure and mechanical properties of maraging steel fabricated by Wire Arc Additive Manufacturing. By employing mixed shielding gases with varying CO<sub>2</sub> proportions (100 % Ar, 95 % Ar + 5 % CO<sub>2</sub>, and 90 % Ar + 10 % CO<sub>2</sub>), the formation quality, thermal cycling characteristics, microstructural evolution, and mechanical performance were systematically analyzed. The results indicated that increasing the CO<sub>2</sub> proportion elevated the arc heat input and reduced cooling rates, leading to grain coarsening and the precipitation of Ti-Al oxides. Microstructural evolution reduced material hardness and tensile strength, but significantly enhanced ductility. Ti-Al oxides cause stress concentration while also acting as a nucleation site for promoting localized plastic deformation. The study revealed the synergistic mechanism of CO<sub>2</sub> through thermal decomposition-induced reactive oxygen, altered arc characteristics, and heat input modulation, providing theoretical guidance for optimizing WAAM process parameters.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148883"},"PeriodicalIF":7.0,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144725041","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-temperature creep response of a nickel-based single crystal superalloy with varying initial microstructures 具有不同初始组织的镍基单晶高温合金的高温蠕变响应

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-28 DOI: 10.1016/j.msea.2025.148881

Jiachen Xu , Huanchang Duan , Xinbao Zhao , Yuan Cheng , Hao Liu , Wanshun Xia , Quanzhao Yue , Yuefeng Gu , Yong Yuan , Ze Zhang

{"title":"High-temperature creep response of a nickel-based single crystal superalloy with varying initial microstructures","authors":"Jiachen Xu , Huanchang Duan , Xinbao Zhao , Yuan Cheng , Hao Liu , Wanshun Xia , Quanzhao Yue , Yuefeng Gu , Yong Yuan , Ze Zhang","doi":"10.1016/j.msea.2025.148881","DOIUrl":"10.1016/j.msea.2025.148881","url":null,"abstract":"<div><div>This study examines the impact of different initial microstructures on the creep behavior of nickel-based single crystal superalloys. Three alloy samples (A1, A2, A3) with varying γ′ precipitate sizes and matrix channel widths were prepared through different aging treatments and subjected to high-temperature creep tests. Results show that the A2 sample, with moderate γ′ precipitate size and narrow matrix channels, exhibited the best creep resistance, lasting the longest in the steady-state stage. In contrast, A1 and A3 samples transitioned into the tertiary stage earlier due to larger or smaller precipitates and wider channels. Dislocation behavior analysis revealed that narrower matrix channels in A2 hindered dislocation motion, promoting a stable dislocation network and reducing superdislocations during creep. Calculations of critical stress and effective lattice misfit confirmed that A2's microstructure enhanced resistance to dislocation motion and antiphase boundary shearing, contributing to its superior creep performance. Overall, the findings highlight that an optimized γ′ precipitate size and matrix channel width significantly improve creep resistance, providing insights for designing high-performance nickel-based single crystal superalloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148881"},"PeriodicalIF":7.0,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144738022","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 TiC-modified Al-Zn-Mg-Cu aluminum alloys fabricated by laser powder bed fusion 激光粉末床熔合tic改性Al-Zn-Mg-Cu铝合金的组织与力学性能

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-28 DOI: 10.1016/j.msea.2025.148878

Xiaohui Liu , Yunzhong Liu , Shuaixing Wang , Nan Du , Shaofeng Yang , Bangyan Zhang

{"title":"Microstructure and mechanical properties of TiC-modified Al-Zn-Mg-Cu aluminum alloys fabricated by laser powder bed fusion","authors":"Xiaohui Liu , Yunzhong Liu , Shuaixing Wang , Nan Du , Shaofeng Yang , Bangyan Zhang","doi":"10.1016/j.msea.2025.148878","DOIUrl":"10.1016/j.msea.2025.148878","url":null,"abstract":"<div><div>Promoting columnar-to-equiaxed transition (CET) of grain structures is a critical strategy for enhancing the printability and mechanical properties of high-strength aluminum alloys fabricated by laser powder bed fusion (LPBF). One effective method to achieve CET is by enhancing the heterogeneous nucleation of α-Al through the use of in-situ L1<sub>2</sub>-Al<sub>3</sub>Ti nucleants. Herein, TiC nanoparticles, which are stable at room temperature, are proposed as a safer and more economical alternative to traditional Ti or TiH<sub>2</sub> particles for triggering the formation of in-situ L1<sub>2</sub>-Al<sub>3</sub>Ti nucleants. The effects of TiC content on the microstructure and tensile properties of LPBF-processed Al-Zn-Mg-Cu aluminum alloys were systematically investigated. The results reveal that TiC nanoparticles effectively induce the formation of potent L1<sub>2</sub>-Al<sub>3</sub>Ti nucleants and prevent grain growth, facilitating CET, grain refinement, and suppressing cracking without requiring extensive modifications to LPBF processing parameters. The resulting alloys exhibit crack-free, dense, equiaxed, and fine-grained microstructures. The density of the as-built alloys reaches 99.2 %, and the average grain area decreases from 348.3 μm<sup>2</sup> to 1.7 μm<sup>2</sup> as the TiC content increases from 0 to 5 wt%. Following conventional T6 heat treatment, the tensile strengths of the LPBF-processed Al-Zn-Mg-Cu aluminum alloys modified with 2.5 wt% TiC are comparable to those of wrought Al-Zn-Mg-Cu aluminum alloys, achieving an ultimate tensile strength (UTS) of 609 MPa, a yield strength (YS) of 537 MPa, and an elongation (El) of 8.3 %, respectively. These findings highlight the potential of TiC nanoparticles as an effective agent for tailoring the microstructure and enhancing the mechanical properties of additively manufactured high-strength aluminum alloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148878"},"PeriodicalIF":7.0,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144738021","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

Configuration evolution and bond-strengthening mechanism of multiscale interfaces in HPR Al/Mg/Al composite plates HPR Al/Mg/Al复合材料多尺度界面形态演化及键合强化机制

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-28 DOI: 10.1016/j.msea.2025.148887

Jia Yang Zhang , Feng Li , Feng Yuan Bao , Yong Jia , Mu Zi Cao

{"title":"Configuration evolution and bond-strengthening mechanism of multiscale interfaces in HPR Al/Mg/Al composite plates","authors":"Jia Yang Zhang , Feng Li , Feng Yuan Bao , Yong Jia , Mu Zi Cao","doi":"10.1016/j.msea.2025.148887","DOIUrl":"10.1016/j.msea.2025.148887","url":null,"abstract":"<div><div>In this study, we present the fabrication of Al/Mg/Al composite plates utilizing hard plate rolling (HPR) technology. Additionally, we have established a theoretical framework for the multiscale strengthening of the interfaces in HPR composite plates, which reveals synergistic effects between micron-scale wavy structures and nano-scale metallurgical bonding. Comparative experiments demonstrate that a 60 % reduction with a Mg/Al thickness ratio of 2:1 at 350 °C significantly enhances the thermal insulation effect of the hard plate, thereby promoting interfacial metallurgical bonding through mechanical interlocking structures. This results in a 91.7 % increase in the thickness of the diffusion layer. Electron backscatter diffraction (EBSD) characterization indicates that the interface of HPR composite plates exhibits a uniform grain distribution and a gradient transition in dislocation density. The thermal-force coupling field facilitates the formation of two types of intermetallic compounds (IMCs) during the rolling composite process. High resolution transmission electron microscopy (HRTEM) analysis reveals that the Al/β- Al<sub>3</sub>Mg<sub>2</sub> and β- Al<sub>3</sub>Mg<sub>2</sub>/γ- Mg<sub>17</sub>Al<sub>12</sub> phase boundaries create a common-lattice interface, while the Mg/γ- Mg<sub>17</sub>Al<sub>12</sub> phase boundary accommodates the lattice mismatch through a semi-coherent interfacial dislocation network. Importantly, the groove-bump configuration at the β/γ phase interface illustrates the synergistic effects of geometrical interlocking and dislocation pinning, resulting in a 35.9 % increase in the ultimate tensile strength (UTS) of the HPR composite plate (223.5 MPa) compared to traditional rolled samples (164.3 MPa). Furthermore, the interfacial bonding strength is found to be 3.8 times that of the traditional rolled samples.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148887"},"PeriodicalIF":7.0,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721407","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

Activation of slip systems in single crystal TiZrNbV with different crystal orientations under quasi-static and dynamic loading conditions 准静态和动态加载条件下不同晶向TiZrNbV单晶滑移系统的激活

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-28 DOI: 10.1016/j.msea.2025.148882

Peiyuan Ma , Zihan Zhang , Zechen Du , Jinlei Dong , Hang Wang , Kerong Ren , Xiaying Ma , Yuliang Lin , Xianqian Wu , Rong Chen

{"title":"Activation of slip systems in single crystal TiZrNbV with different crystal orientations under quasi-static and dynamic loading conditions","authors":"Peiyuan Ma , Zihan Zhang , Zechen Du , Jinlei Dong , Hang Wang , Kerong Ren , Xiaying Ma , Yuliang Lin , Xianqian Wu , Rong Chen","doi":"10.1016/j.msea.2025.148882","DOIUrl":"10.1016/j.msea.2025.148882","url":null,"abstract":"<div><div>The deformation behavior of single-crystal materials is influenced by both strain rate and crystal orientation. This study examines single-crystal TiZrNbV high-entropy alloys with a body-centered cubic (BCC) structure using Vickers hardness testing, particle ballistic experiments, and crystal plasticity finite element simulations to investigate the material mechanical property and deformation mechanisms. Results reveal crystal orientation-dependent deformation characteristics: (001) and (101) crystal orientations exhibit two-fold symmetry in pile-up deformation, while (111) shows three-fold symmetry. These differences arise from the geometric relationships between crystal orientation and the slip directions of active systems. Despite these variations, the alloy demonstrates orientation-insensitive mechanical strength, with quasi-static and dynamic yield strengths varying by only 1 % and 3 %, respectively, across the three orientations. This insensitivity is attributed to the widespread activation of slip systems under both loading conditions. At ultra-high strain rates (10<sup>5</sup>–10<sup>7</sup> s<sup>−1</sup>), the dominant strengthening mechanism shifts from thermally activated dislocation motion to phonon drag. As strain rate increases, phonon drag contributions become more significant, while the effects of short- and long-range obstacles diminish. These findings highlight the central role of crystal orientation and strain rate in governing the mechanical response of BCC-structured high-entropy alloys and provide insight into their deformation mechanisms under extreme loading conditions.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148882"},"PeriodicalIF":7.0,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144738009","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 unique interfacial structure, excellent mechanical performance and desired degradation behavior in novel Zn/Mg shell-core biocomposites via a two-step co-extrusion process 通过两步共挤工艺，获得了独特的界面结构、优异的力学性能和理想的降解行为

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-28 DOI: 10.1016/j.msea.2025.148866

Xin Wang , Ying Liu , Yingjian Lin , Xiaohao Sun , Debao Liu

{"title":"Achieving unique interfacial structure, excellent mechanical performance and desired degradation behavior in novel Zn/Mg shell-core biocomposites via a two-step co-extrusion process","authors":"Xin Wang , Ying Liu , Yingjian Lin , Xiaohao Sun , Debao Liu","doi":"10.1016/j.msea.2025.148866","DOIUrl":"10.1016/j.msea.2025.148866","url":null,"abstract":"<div><div>Herein, to address the clinical need for biodegradable materials that provide mechanical support through slow degradation in the early stages of implantation and rapid degradation after bone healing to reduce the implant's residence time in the body, a novel Zn/Mg shell-core biocomposite was developed via a precisely controlled two-step co-extrusion process. A unique interface structure, consisting of an MgZn<sub>2</sub> intermetallic interlayer, a Mg-rich diffusion layer in the Zn matrix, and a Zn-rich diffusion layer in the Mg matrix, was confirmed in the experimental composites. Through low-temperature and low-speed secondary extrusion, the grains of the Mg core and Zn shell were significantly refined, with average grain sizes of 0.51 μm for the Mg core and 1.45 μm for the Zn shell. Thanks to the intimate interfacial connection and the significant grain refinement, an ultimate tensile strength (UTS) of 337.5 MPa, a yield strength (YS) of 311.4 MPa, and failure strain of 16.3 % were achieved, indicating a good balance of strength and plasticity. After 4 months of immersion in simulated body fluid (SBF), the Zn/Mg bimetallic composite exhibited a degradation rate of 0.016 mm/y, demonstrating that the Zn shell effectively protects the Mg core from corrosion, maintaining mechanical integrity during the initial period. Through precise adjustment of Zn shell thickness, the composite's degradation period can be precisely tuned within a broad range of 5–72 months, enabling optimal matching with bone regeneration timelines. This investigation establishes a novel paradigm for designing biodegradable implants with degradation profiles tailored to physiological healing processes.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148866"},"PeriodicalIF":7.0,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144725042","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 behavior of Al-Zn-Mg-Cu alloy fabricated by wire-arc directed energy deposition with rotating friction processing 旋转摩擦法线弧定向能沉积Al-Zn-Mg-Cu合金的组织与力学行为

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-27 DOI: 10.1016/j.msea.2025.148884

Fangbin Deng, Shengfu Yu, Hao Wu, Zhenyu Yu, Guozhi Yu

{"title":"Microstructure and mechanical behavior of Al-Zn-Mg-Cu alloy fabricated by wire-arc directed energy deposition with rotating friction processing","authors":"Fangbin Deng, Shengfu Yu, Hao Wu, Zhenyu Yu, Guozhi Yu","doi":"10.1016/j.msea.2025.148884","DOIUrl":"10.1016/j.msea.2025.148884","url":null,"abstract":"<div><div>This study introduces a novel hybrid manufacturing strategy by integrating interlayer rotary friction processing (RFP) with wire-arc directed energy deposition (WA-DED). This approach aims to resolve the microstructural heterogeneity and insufficient mechanical performance commonly observed in WA-DED Al–Zn–Mg–Cu alloys. A comprehensive investigation was conducted to evaluate the influence of RFP on columnar grain fragmentation and orientation redistribution. These effects collectively elucidate the multiscale mechanisms underlying the simultaneous microstructural transformation and mechanical performance enhancement. The results demonstrate that the synergistic effects of shear deformation and frictional heating during RFP effectively interrupt the directional growth of coarse columnar grains, leading to a heterogeneous structure composed of alternating fine- and coarse-grained regions. Simultaneously, the brittle S phase (Al<sub>2</sub>CuMg), which was originally segregated along grain boundaries, undergoes dissolution, while the formation of a higher density of fine η′ precipitates is promoted. Benefiting from the combined strengthening mechanisms of dislocation accumulation, grain refinement, and Orowan looping, the ultimate tensile strength and yield strength increased by 33.3 % and 15.1 %, respectively, while a notable elongation of 9.1 % was achieved, indicating an excellent balance between strength and ductility. The proposed “additive deposition + interlayer plastic disturbance” strategy provides valuable theoretical insight and engineering potential for the high-integrity fabrication of high-performance aluminum alloy components.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148884"},"PeriodicalIF":7.0,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721499","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