Materials Characterization最新文献_第3页

In situ observation of eutectic and primary TiB formation and their thermodynamic and kinetic mechanisms during the solidification of titanium alloys 钛合金凝固过程中共晶和初晶TiB形成的原位观察及其热力学和动力学机制

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-21 DOI: 10.1016/j.matchar.2025.115399

Hongze Fang , Jichang Yu , Ruirun Chen , Jiaqi Hao , Bobo Li , Baohui Zhu , Xianfei Ding , Jingjie Guo

{"title":"In situ observation of eutectic and primary TiB formation and their thermodynamic and kinetic mechanisms during the solidification of titanium alloys","authors":"Hongze Fang , Jichang Yu , Ruirun Chen , Jiaqi Hao , Bobo Li , Baohui Zhu , Xianfei Ding , Jingjie Guo","doi":"10.1016/j.matchar.2025.115399","DOIUrl":"10.1016/j.matchar.2025.115399","url":null,"abstract":"<div><div>To investigate the thermodynamic and dynamic formation mechanism of eutectic and primary TiB particle morphologies, a Ti-4Al-6Cr-5Mo-8Nb alloy with varying boron contents was prepared, and in-situ observations were conducted during solidification. The phase morphology, distribution, transformation during solidification, and thermodynamic calculations were systematically studied, and the underlying mechanisms were revealed. The results show that when the boron content is 1.2 wt%, both eutectic and primary TiB phases are present, whereas at a boron content of 0.4 wt%, only the eutectic TiB phase is observed. The eutectic TiB appears as fine, short rods predominantly located at β grain boundaries, while primary TiB forms large, elongated needles distributed across β grains. The average lengths of the eutectic TiB and primary TiB are 6.16 μm and 37.87 μm, respectively, with both exhibiting a similar width of approximately 2.65 μm. Compared to 0.4B alloy, the β grain size in 1.2B alloy decreased by 65 %. Thermodynamic calculations determined the effective phase transformation driving force for the formation of primary TiB to be 119.6 J/mol, with a theoretical size of 34.55 μm. The theoretical size of eutectic TiB at a born content of 0.4 wt% was calculated to be 5.26 μm, based on a maximum growth rate of 3.75 × 10<sup>−11</sup> m/s during the eutectic reaction. A paired <em>t</em>-test confirmed that the error between the calculated and experimental values was within acceptable limits. The conclusion of this article can provide a theoretical and experimental foundation for predicting the sizes of TiB in boron-modified titanium alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115399"},"PeriodicalIF":4.8,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144694378","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

Ambient air unstable oxygen-deficient face-centered cubic NdOx phases in sintered NdFeB magnets 烧结钕铁硼磁体中环境空气不稳定缺氧面心立方NdOx相

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-21 DOI: 10.1016/j.matchar.2025.115408

Xin Fu

{"title":"Ambient air unstable oxygen-deficient face-centered cubic NdOx phases in sintered NdFeB magnets","authors":"Xin Fu","doi":"10.1016/j.matchar.2025.115408","DOIUrl":"10.1016/j.matchar.2025.115408","url":null,"abstract":"<div><div>The rapid ambient air (20 ± 3 °C, <55 % RH) oxidation and dramatic volume expansion of some Nd-rich phases have been identified in a large-area and clean sintered NdFeB slab. Quasi-in-situ studies combining a focused ion/electron dual beam system (FIB/SEM) and a scanning/transmission electron microscope (S/TEM) have revealed both uniform and non-uniform oxidation in oxygen-deficient face-centered cubic (fcc) NdO<sub>x</sub> phases. After 5 min of exposure to ambient air, the fcc (Nd + Pr)O<sub>0.47</sub> oxidized, developing a porous amorphous oxidation layer over a hundred nanometers thick that expanded from the surface. The inhomogeneous distribution of oxygen in a fcc NdO<sub>x</sub> grain induced non-uniform oxidation, with the low oxygen content region preferentially oxidized in ambient air, resulting in an amorphous transition. After several months of exposure to ambient air, the initially amorphous oxidation products transformed to hexagonal close-packed Nd(OH)<sub>3</sub>. The electron beam irradiation-induced phase transition studies suggest that the amorphous transition of oxygen-deficient fcc NdO<sub>x</sub> during ambient air oxidation is driven by a reaction with oxygen rather than water vapor, as no water molecule decomposition was detected.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115408"},"PeriodicalIF":4.8,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144702394","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

The role of Ta in the microstructure evolution and high-temperature oxidation behavior of Inconel 625 superalloy fabricated by directed energy deposition Ta在定向能沉积法制备Inconel 625高温合金组织演变及高温氧化行为中的作用

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-21 DOI: 10.1016/j.matchar.2025.115409

Jingkui Li , Ke Yang , Xiangyu Xu , Linlin Pan , Xu Xie , Volodymyr Korzhyk , Xiaodong Zou

{"title":"The role of Ta in the microstructure evolution and high-temperature oxidation behavior of Inconel 625 superalloy fabricated by directed energy deposition","authors":"Jingkui Li , Ke Yang , Xiangyu Xu , Linlin Pan , Xu Xie , Volodymyr Korzhyk , Xiaodong Zou","doi":"10.1016/j.matchar.2025.115409","DOIUrl":"10.1016/j.matchar.2025.115409","url":null,"abstract":"<div><div>Directed energy deposition (DED) holds great promise for fabricating Inconel 625 (IN625) superalloy components. However, issues such as grain coarsening and element segregation during DED processes pose significant challenges to the high-temperature oxidation resistance of IN625, especially at temperatures above 1000 °C. In the present study, Ta was incorporated into the IN625 alloy to fabricate the components with outstanding high-temperature oxidation resistance at 1100 °C via plasma arc DED. The influence of different Ta contents (0.2 wt%, 0.5 wt%, and 1.0 wt%) on the microstructure and high-temperature oxidation behavior at 1100 °C of DEDed IN625 were investigated. Results showed that with the increase of Ta content, the grains of IN625 were refined, and the precipitation of Laves phase reduced. Furthermore, it was observed that adding Ta remarkably decreased the oxidation rate of DEDed IN625 during the high-temperature oxidation testing at 1100 °C for 150 h. Compared to the IN625 sample, the mass gains of sample after the addition of 1 wt% Ta are reduced by 90.77 %. The refinement of grains and reduction in Laves phase allowed more Cr to transport to the oxidized surface to form a dense and protective Cr₂O₃ film during the initial stage of high-temperature oxidation. Subsequently, Ta atoms migrated to the Cr₂O₃ oxide layer/matrix interface, and combined with oxygen to form TaNbO<sub>5</sub>, which not only hindered the oxygen intrusion but also inhibited the outward diffusion of Nb, thereby preventing the formation of CrNbO₄ with poor adhesion to the matrix. Consequently, the oxidation rate was significantly reduced.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115409"},"PeriodicalIF":4.8,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144694308","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

In depth analysis of microstructure and mechanical properties of joints in thick plate friction stir welding of high–strength Al–Zn–Mg–Cu alloy 深入分析了高强度Al-Zn-Mg-Cu合金厚板搅拌摩擦焊接接头的组织和力学性能

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-21 DOI: 10.1016/j.matchar.2025.115401

Shuang-Shuang Li , Hong-Yu Yang , Bai-Xin Dong , Shi-Li Shu , Tian-Shu Liu , Feng Qiu , Qi-Chuan Jiang

{"title":"In depth analysis of microstructure and mechanical properties of joints in thick plate friction stir welding of high–strength Al–Zn–Mg–Cu alloy","authors":"Shuang-Shuang Li , Hong-Yu Yang , Bai-Xin Dong , Shi-Li Shu , Tian-Shu Liu , Feng Qiu , Qi-Chuan Jiang","doi":"10.1016/j.matchar.2025.115401","DOIUrl":"10.1016/j.matchar.2025.115401","url":null,"abstract":"<div><div>This study investigated the microstructure and mechanical performance of 8 mm-thick Al–Zn–Mg–Cu (AZMC) alloy joints fabricated by friction stir welding (FSW) under various combinations of tool rotational speeds (RSp, 400, 800, 1200 rpm) and welding speeds (WSp, 50, 100, 150 mm/min), both with and without post-weld heat treatment (PWHT). In the as-welded condition, both grain size and precipitate size in the nugget zone (NZ) increased with heat input, ranging from 1.46 μm and 0.27 μm to 2.45 μm and 0.73 μm, respectively. Meanwhile, the microhardness of NZ increased with both RSp (from 139.8 HV at 400 rpm to 152.1 HV at 1200 rpm) and WSp (from 132.8 HV at 50 mm/min to 140.2 HV at 150 mm/min), primarily due to the competition between grain boundary, precipitation, and solid solution strengthening mechanisms. PWHT induced abnormal grain growth (AGG) at low and medium heat input, which was suppressed under high heat input; the estimated Zener–Hollomon threshold for AGG was 4.7 × 10<sup>11</sup>–6.6 × 10<sup>11</sup> s<sup>−1</sup>. The 1200 (RSp)–100 (WSp) condition delivered the best weld-direction (WD) performance (σ<sub>YS</sub> = 610 MPa, σ<sub>UTS</sub> = 662 MPa, δ<sub>EL</sub> = 9.5 %), reaching up to 97.9 % of base material (BM)’s properties, primarily due to the retention of ultrafine grains after PWHT. In the transverse direction (TD), 400–100 yielded the highest strength (σ<sub>YS</sub> = 591 MPa, σ<sub>UTS</sub> = 654 MPa; 94.0 % and 96.9 % of BM), while 400–150 showed the best ductility (δ<sub>EL</sub> = 10.2 %, 107.4 % of BM). The plasticity variation in the TD under different parameters is largely attributed to the uniformity and grain size differences between the NZ and TMAZ. These results highlight the critical role of optimized FSW parameters and PWHT in enhancing joint performance for high-strength thick Al alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115401"},"PeriodicalIF":4.8,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144711897","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

Prediction and quantitative study on the dimensional evolution of Al-Cu-Mg alloy with single-precipitate phase during isothermal aging 等温时效过程中单析出相Al-Cu-Mg合金尺寸演变的预测与定量研究

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-20 DOI: 10.1016/j.matchar.2025.115404

Rongdi Pan, Yiming Wu, Linlin Fu, Shanqi Du, Yongxiao Zhou, Linchao Wang, Yu Xiong, Jing Qiao, Xiuli Han, Gaohui Wu

{"title":"Prediction and quantitative study on the dimensional evolution of Al-Cu-Mg alloy with single-precipitate phase during isothermal aging","authors":"Rongdi Pan, Yiming Wu, Linlin Fu, Shanqi Du, Yongxiao Zhou, Linchao Wang, Yu Xiong, Jing Qiao, Xiuli Han, Gaohui Wu","doi":"10.1016/j.matchar.2025.115404","DOIUrl":"10.1016/j.matchar.2025.115404","url":null,"abstract":"<div><div>As aluminum alloys are widely employed in the fabrication of precision instruments, their dimensional changes can adversely affect the accuracy and reliability of the final products. In this study, a predictive model was developed to quantitatively estimate the macroscopic dimensional change rate of an Al-Cu-Mg alloy containing a single precipitate phase during the aging process. An alloy composition of Al-4.33Cu-1.74 Mg wt% was designed through thermodynamic calculations, revealing that matrix lattice contraction and S phase precipitation are the dominant contributors to dimensional change rates. Microstructural characterization further demonstrated a deviation in the atomic ratio of Mg to Cu within the S II phase, with a measured Mg: Cu ratio of 1.38:1 in the S II phase after 24 h of aging. Incorporating these findings, a quantitative model was established by combining the calculated volume fraction of the S phase and lattice constant variation obtained from thermodynamic analysis. Upon introducing a kinetic correction factor, the predicted dimensional change rates exhibited excellent agreement with experimental measurements (e.g., −5.71 × 10<sup>−5</sup> vs. −4.57 × 10<sup>−5</sup> at 48 h). This work offers a comprehensive approach for accurately predicting the dimensional stability of Al-Cu-Mg alloys, providing valuable insights for alloy design and precision component fabrication.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115404"},"PeriodicalIF":4.8,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144711898","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

Deformation coordination behaviors and microstructure evolution of 1060Al/6061Al-SiC/1060Al composites during hot deformation 1060Al/6061Al-SiC/1060Al复合材料热变形过程中的变形配位行为及显微组织演变

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-20 DOI: 10.1016/j.matchar.2025.115400

Zhijuan Zhang , Bing Zhang , Zhaolin Wang , Zhiqiang Lei , Shancheng Zhan , Kuaishe Wang

{"title":"Deformation coordination behaviors and microstructure evolution of 1060Al/6061Al-SiC/1060Al composites during hot deformation","authors":"Zhijuan Zhang , Bing Zhang , Zhaolin Wang , Zhiqiang Lei , Shancheng Zhan , Kuaishe Wang","doi":"10.1016/j.matchar.2025.115400","DOIUrl":"10.1016/j.matchar.2025.115400","url":null,"abstract":"<div><div>The hot deformation behavior and microstructure evolution of 1060Al/6061Al-SiC/1060Al laminated particle-reinforced aluminum matrix composites (LPRAMCs) under different process parameters and the deformation coordination between the component layers were investigated by hot-compression technology. The deformation of the LPRAMCs was dominated by work-hardening as exhibited by the flow stress curves, and stress decrease occurred at high strain rate (20 s<sup>−1</sup>) when the strain was greater than 0.8 due to the deformation incoordination between the SiC particles and the Al matrix. The deformation in the central region of the composite after compression was dominated by the SiC-reinforced 6061Al layer (CS layer). In contrast, the deformation at the edge was primarily governed by the 1060Al layer (Al layer), and the optimal deformation coordination was achieved under the high-temperature/low-strain-rate region (400–500 °C/0.01–1 s<sup>−1</sup>). The microstructural evolution indicated that 1060Al has equiaxed fine grains near the interface and coarse grains away from the interface, the recrystallization of 6061Al in the CS layer occurred earlier than that of 1060Al in the Al layer, and the grain size (GS) of 6061Al was less affected by the deformation parameters due to the SiC particles in the CS layer. With the increase of lnZ, the recrystallized proportion of Al grains in the Al layer and CS layer decreased gradually.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115400"},"PeriodicalIF":4.8,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144678882","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

Connection reinforcement design of ODS-W/Cu joint: Transforming immiscible interface into dual reaction diffusion interface ODS-W/Cu接头的连接加固设计：将非混相界面转变为双反应扩散界面

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-20 DOI: 10.1016/j.matchar.2025.115402

Dang Xu , Pengqi Chen , Kaichao Fu , Changcheng Sang , Ruizhi Chen , Tao Hong , Jigui Cheng , Kai Xu

{"title":"Connection reinforcement design of ODS-W/Cu joint: Transforming immiscible interface into dual reaction diffusion interface","authors":"Dang Xu , Pengqi Chen , Kaichao Fu , Changcheng Sang , Ruizhi Chen , Tao Hong , Jigui Cheng , Kai Xu","doi":"10.1016/j.matchar.2025.115402","DOIUrl":"10.1016/j.matchar.2025.115402","url":null,"abstract":"<div><div>The inherent metallurgical incompatibility between dissimilar metals such as tungsten (W) and copper (Cu) engenders weak chemical bonding, substantially constraining the attainment of high strength. This constitutes a critical limitation for nuclear fusion applications demanding robust interfacial integrity. To address these limitations, this study introduces a dual interface reinforcement strategy employing a CrCoNi medium entropy alloy (MEA) interlayer and achieving diffusion bonding of oxide diffusion-strengthened tungsten (ODS-W) and Cu through spark plasma sintering (SPS) technology. At the optimized bonding temperature of 1000 °C, the joint achieves a maximum tensile strength of 256.7 ± 8.2 MPa, corresponding to a 171 % enhancement over direct bonding (DB) joint (94.6 ± 5.1 MPa), accompanied by a fracture mode transition from brittle to ductile failure. Multi-scaled microstructure and interface element diffusion behavior analyses reveal that reactive diffusion at the W/MEA interface facilitates the formation of a solution-strengthened matrix associated with an amorphous diffusion layer. Whereas mutual diffusion at the Cu/MEA interface induces multiple phase structures, resulting concurrently in solid solution strengthening and precipitation strengthening, thereby reinforcing the interface bonding. This dual interface reinforcement methodology establishes an effective design strategy for enhancing mechanical properties in immiscible metal systems.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115402"},"PeriodicalIF":4.8,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144678881","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

Characterizations of the anisotropic features of the phase, texture and deformation behavior of laser powder bed fusion-processed H13 steel 激光粉末床熔合加工H13钢的相、织构和变形行为的各向异性特征

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-20 DOI: 10.1016/j.matchar.2025.115403

Huajing Zong, Nan Kang, Mohamed El Mansori

{"title":"Characterizations of the anisotropic features of the phase, texture and deformation behavior of laser powder bed fusion-processed H13 steel","authors":"Huajing Zong, Nan Kang, Mohamed El Mansori","doi":"10.1016/j.matchar.2025.115403","DOIUrl":"10.1016/j.matchar.2025.115403","url":null,"abstract":"<div><div>H13 steel with a relative density of approximately 99.9 % was fabricated by LPBF with 200 °C preheating (H13−200). Samples were built along horizontal (0°, H13<img>200H) and vertical (90°, H13–200 V) orientations relative to the build platform to investigate the anisotropy of microstructural features and mechanical properties. Despite similar grain morphology, size, and crystallographic texture, the retained austenite (RA) content varied between orientations. H13–200 V exhibited higher RA fractions due to enhanced intrinsic tempering. Compared to previously reported H13 steel processed with similar or no preheating, H13–200 demonstrated higher tensile strength and elongation, with no notable tensile anisotropy observed. The deformation and damage evolution mechanisms were analyzed. Strain hardening and ductility were promoted by the formation of a fine cellular substructure and the transformation-induced plasticity effect from RA. Fractographic and microstructural analyses revealed that RA suppressed crack propagation and contributed to damage tolerance. These results demonstrate that moderate preheating can effectively tailor the phase composition and enhance mechanical performance without introducing notable anisotropy in LPBF H13 steel.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115403"},"PeriodicalIF":4.8,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686983","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

Fabrication of Al/Ni multilayers with excellent layer continuity by combination of accumulative pack rolling and roll bonding 利用累积积层轧制和轧制键合相结合的方法制备具有优异层连续性的Al/Ni多层膜

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-19 DOI: 10.1016/j.matchar.2025.115397

Ning Nie , Guanyu Deng , Lihong Su , Yu Liu , Hui Wang , Huijun Li , Anh Kiet Tieu

{"title":"Fabrication of Al/Ni multilayers with excellent layer continuity by combination of accumulative pack rolling and roll bonding","authors":"Ning Nie , Guanyu Deng , Lihong Su , Yu Liu , Hui Wang , Huijun Li , Anh Kiet Tieu","doi":"10.1016/j.matchar.2025.115397","DOIUrl":"10.1016/j.matchar.2025.115397","url":null,"abstract":"<div><div>Fabrication of Al/Ni multilayer sheets with great layer continuity has always been a challenge due to early necking and rupture of Ni layer in rolling process, which usually results in a structure with Ni fragments in Al matrix and induces poor thermal performance. This study investigates the fabrication and characterization of Al/Ni multilayer sheets with a focus on achieving excellent layer continuity. The multilayers were prepared using accumulative pack rolling (APR) and roll bonding techniques, combining aluminum alloys (AA1050 and AA7075) with Ni to form laminated composites with controlled thickness ratios. The mechanical compatibility between materials by heat treatment and warm roll bonding was emphasized to mitigate plastic instability, such as shear banding and necking, which disrupt layer continuity. Differential scanning calorimetry (DSC) was employed to evaluate the thermal performance and the formation of intermetallic compounds, including Al<sub>3</sub>Ni and Al<sub>3</sub>Ni<sub>2</sub>. The results indicate that AA7075/Ni multilayers exhibit excellent structural integrity and thermal response compared to AA1050/Ni. While achieving bilayer thicknesses as thin as 5–10 μm, the study also highlights the issues of bonding quality in thinner layers and the impact of thickness ratios on heat release efficiency. This work demonstrates the potential of heat treatment and warm roll bonding as cost-effective, scalable methods for fabricating high-performance AA7075/Ni multilayers and provides valuable insights into optimizing their design for thermal and mechanical applications.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115397"},"PeriodicalIF":4.8,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686981","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

Enhancing mechanical performance of high manganese austenitic steel through deformation at cryogenic temperatures and high strain rates 通过在低温和高应变速率下的变形提高高锰奥氏体钢的力学性能

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-17 DOI: 10.1016/j.matchar.2025.115379

Hongyan Guo , Wentao Wu , Xin Tan , Erkang Liu , Youliang Zhao , Feng Zhao , Bin Gan , Kaixuan Chen , Xiyue Liu , Naisheng Jiang , Min Xia , Manchao He

{"title":"Enhancing mechanical performance of high manganese austenitic steel through deformation at cryogenic temperatures and high strain rates","authors":"Hongyan Guo , Wentao Wu , Xin Tan , Erkang Liu , Youliang Zhao , Feng Zhao , Bin Gan , Kaixuan Chen , Xiyue Liu , Naisheng Jiang , Min Xia , Manchao He","doi":"10.1016/j.matchar.2025.115379","DOIUrl":"10.1016/j.matchar.2025.115379","url":null,"abstract":"<div><div>We investigate the mechanical properties of a novel high‑manganese austenitic steel (HMAS) subjected to dynamic tensile loading at 3000 s-1 at a cryogenic temperature (77 K) using a split Hopkinson tension bar (SHTB) coupled with a cooling system. Compared to room temperature quasi-static tensile, we observed significant increases in yield strength from 850 MPa to 1260 MPa and tensile strength from 1100 MPa to 1620 MPa, along with a fracture strain of 0.41. These enhancements are primarily attributed to the microstructure evolution under dynamic loading at high strain rates at cryogenic temperature, particularly the formation of complex deformation twins (DTs) networks that contribute to strain-hardening, thereby enhance both strength and ductility of HMAS under extreme conditions. These findings not only demonstrate the impact of extremely cryogenic temperatures and high strain rates on the mechanical behavior of HMAS, but also highlight its potential in applications that demand robust performance in harsh environments.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115379"},"PeriodicalIF":4.8,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663565","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