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

{"title":"Optimization of process parameters in wire arc additive manufacturing for strengthening cracked steel plates: A thermo-mechanical study","authors":"H. Dahaghin ,&nbsp;H. Moshayedi ,&nbsp;S.M. Zahrai ,&nbsp;M. Motavalli ,&nbsp;E. Ghafoori","doi":"10.1016/j.jmrt.2025.09.167","DOIUrl":"10.1016/j.jmrt.2025.09.167","url":null,"abstract":"<div><div>Wire Arc Additive Manufacturing (WAAM) also known as wire arc-based directed energy deposition (WA-DED) has emerged as a promising technology for repairing and strengthening steel structures. This study investigates the optimization of key process parameters in the WAAM process to improve residual stress (RS) distribution and structural integrity of cracked steel plates. A thermo-mechanical finite element model is developed and validated to predict temperature evolution and RS profiles. Following determination of the optimal dwell time type, the effects of travel speed, dwell time, and substrate preheating temperature on thermal history, RS distribution at the WAAM/plate interface, and maximum stress under external loading are systematically analyzed. The results reveal that increasing travel speed effectively reduces tensile residual stresses, while extended dwell times lead to higher residual and maximum stresses due to increased thermal gradients. Additionally, substrate preheating significantly lowers tensile residual stresses but also reduces compressive stresses near the crack tip, which may influence crack arrest effectiveness. By optimizing the combination of process parameters, reductions of up to 40 % in both maximum residual stress and maximum stress under external loading were achieved. These findings provide valuable insights for enhancing the fatigue performance and structural reliability of WAAM-strengthened steel components.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1311-1329"},"PeriodicalIF":6.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159786","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":"Influence of as-cast and forged states on constitutive behavior and hot processing maps of INCONEL 783 superalloy","authors":"Zhigang Wang ,&nbsp;Lixin Zhou ,&nbsp;Liyang Wang ,&nbsp;Bing Ye ,&nbsp;Guangwei Han","doi":"10.1016/j.jmrt.2025.09.187","DOIUrl":"10.1016/j.jmrt.2025.09.187","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Inconel 718 or GH6783, a critical nickel-based superalloy for key components in advanced aircraft engines, presents significant manufacturing challenges due to its inherently poor workability and narrow thermomechanical processing window, demanding innovative approaches for precise and defect-free fabrication. The constitutive behavior and hot work processing map of both as-cast and forged IN-783 alloy are studied at different temperatures and strain rates. The forged IN-783 alloy demonstrates greater resistance to flow instability, particularly at temperatures above 1100 °C, accompanied by higher peak power-dissipation efficiency (40 %–45 %) compared to the as-cast state (35 %–38 %). The established Zener-Hollomon constitutive equations relates flow strength σ (MPa) and T (K) and strain rate &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mover&gt;&lt;mi&gt;ε&lt;/mi&gt;&lt;mo&gt;˙&lt;/mo&gt;&lt;/mover&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (s&lt;sup&gt;−1&lt;/sup&gt;) for as-cast state is&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;172.85&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;ln&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;[&lt;/mo&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mfrac&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;2.91&lt;/mn&gt;&lt;mo&gt;×&lt;/mo&gt;&lt;msup&gt;&lt;mn&gt;10&lt;/mn&gt;&lt;mn&gt;17&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/mfrac&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mfrac&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mn&gt;3.93&lt;/mn&gt;&lt;/mfrac&gt;&lt;/msup&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;msqrt&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mfrac&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;2.91&lt;/mn&gt;&lt;mo&gt;×&lt;/mo&gt;&lt;msup&gt;&lt;mn&gt;10&lt;/mn&gt;&lt;mn&gt;17&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/mfrac&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mfrac&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mn&gt;3.93&lt;/mn&gt;&lt;/mfrac&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/msqrt&gt;&lt;/mrow&gt;&lt;mo&gt;]&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mover&gt;&lt;mi&gt;ε&lt;/mi&gt;&lt;mo&gt;˙&lt;/mo&gt;&lt;/mover&gt;&lt;msup&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mfrac&gt;&lt;mn&gt;57363.5&lt;/mn&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;/mfrac&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;,&lt;/div&gt;&lt;div&gt;whereas that for forged state is.&lt;/div&gt;&lt;div&gt;&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;167.5&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;ln&lt;/mi&gt;&lt;mrow&gt;&lt;mo&gt;[&lt;/mo&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mfrac&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;1.98&lt;/mn&gt;&lt;mo&gt;×&lt;/mo&gt;&lt;msup&gt;&lt;mn&gt;10&lt;/mn&gt;&lt;mn&gt;20&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/mfrac&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mfrac&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mn&gt;4.15&lt;/mn&gt;&lt;/mfrac&gt;&lt;/msup&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;msqrt&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mfrac&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;1.98&lt;/mn&gt;&lt;mo&gt;×&lt;/mo&gt;&lt;msup&gt;&lt;mn&gt;10&lt;/mn&gt;&lt;mn&gt;20&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/mfrac&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mfrac&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mn&gt;4.15&lt;/mn&gt;&lt;/mfrac&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/msqrt&gt;&lt;/mrow&gt;&lt;mo&gt;]&lt;/mo&gt;&lt;/mrow&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;Z&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mover&gt;&lt;mi&gt;ε&lt;/mi&gt;&lt;mo&gt;˙&lt;/mo&gt;&lt;/mover&gt;&lt;msup&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mfrac&gt;&lt;mn&gt;66942.5&lt;/mn&gt;&lt;mi&gt;T&lt;/mi&gt;&lt;/mfrac&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;.&lt;/div&gt;&lt;div&gt;Based on hot processing maps, preliminary breakdown deformation for as-cast alloy, should be conducted at lower strain rates ∼0.1 s&lt;sup&gt;−1&lt;/sup&gt; near 1050 °C, followed by a finishing pass at approximately 1050 °C and lower strain rate ∼0.05 s&lt;sup&gt;−1&lt;/sup&gt;. The recommended processing conditions for forged IN-783 alloy are deformation at 1080–1120 °C and 0.3–0.6 s&lt;sup&gt;−1&lt;/sup&gt;. The forged IN-783 alloy exhibits superior thermal stability with a higher activation energy (556.6 kJ/mol vs. 476.9 kJ/mol), extended safe-processing temperature ran","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1379-1395"},"PeriodicalIF":6.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159781","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":"Microstructure and thermal stability of oxidized copper produced by electron beam powder bed fusion","authors":"Prithwish Tarafder ,&nbsp;Justinas Palisaitis ,&nbsp;Lingyin Meng ,&nbsp;Jinghao Xu ,&nbsp;Mohammadreza Jandaghi ,&nbsp;Johan Moverare","doi":"10.1016/j.jmrt.2025.09.194","DOIUrl":"10.1016/j.jmrt.2025.09.194","url":null,"abstract":"<div><div>Oxygen in copper can potentially minimize the grain width because of the high grain growth restriction factor, and hence can modify the overall microstructure. In this study, bulk copper samples were produced via electron beam powder bed fusion with the same process parameters using different powder types: one virgin powder type with low oxygen content and two furnace-treated powder types with progressively higher oxygen contents. The oxidized copper samples showed refined grain structures with cellular sub-grains that evolved with cuprous oxide nanoparticles at the sub-grain boundaries. However, despite a high grain growth restriction factor, oxide nanoparticles do not serve as active sites for heterogeneous nucleation because of the high lattice mismatch. The thermal stability of the oxide nanoparticles and cellular sub-grain structure was tested by thermogravimetric analysis (TGA) and annealing heat treatment (AHT). While AHT preserved the sub-grain structure, the TGA experiment led to a concomitant dissolution of the same followed by thermally activated agglomeration of the cuprous oxide nanoparticles. Nevertheless, even with high oxygen content, a good combination of microhardness and electrical conductivity was observed. This approach demonstrates the feasibility of using oxidized copper powder for certain applications instead of recycling due to the need for high-purity virgin powder.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1133-1147"},"PeriodicalIF":6.6,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120917","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":"Microstructure and mechanical properties of microwave-sintered Ni-alloyed Ti3SiC2/graphene co-reinforced lamellar porous Fe-7.5Cu composites","authors":"Ailun Deng ,&nbsp;Rui Shu ,&nbsp;Hongliang Sun ,&nbsp;Zixuan Wu ,&nbsp;Liu Yang ,&nbsp;David Hui ,&nbsp;Xiaosong Jiang","doi":"10.1016/j.jmrt.2025.09.185","DOIUrl":"10.1016/j.jmrt.2025.09.185","url":null,"abstract":"<div><div>Porous Fe–Cu alloys are crucial for frictional applications such as bearings and gears, where their low density and porosity are advantageous for lubrication. However, the inherent microstructural defects hinder the achievement of high strength and ductility under harsh conditions, limiting their durability and widespread application. This study aims to address this deficiency through the synergistic optimization of Ni alloying and dual-phase reinforcements within biomimetic layered structures. The method combines microwave sintering with flake powder metallurgy technology, incorporating 1–7 % Ni into the Fe–7.5Cu matrix, while adding 1 % copper-coated graphene (GNP(Cu)) and 6 % Ti₃SiC₂ to enhance the control effects. The composite material with 7 % Ni demonstrates excellent performance: a tensile strength increase of 25.13 %, reaching 232.3 MPa, and a compressive strength increase of 16.14 %, reaching 675.1 MPa, with an average copper particle size increase of 79.46 % due to the sintering effects promoted by Ni. These improvements arise from the solid-solution effect and grain refinement induced by nickel, complemented by the Orowan effect, thermal mismatch, and load transfer mechanisms from GNP(Cu), Ti₃SiC₂, and TiC/Fe₃C products, which together suppress dislocations and refine the microstructure while maintaining approximately 23 % porosity. The advantage of this approach lies in achieving a balanced synergy between strength and ductility, avoiding excessive densification, and providing new insights into the alloying strategies for high-performance sustainable porous metal matrix composites in harsh industrial environments.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 715-729"},"PeriodicalIF":6.6,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108956","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":"Overcoming strength-ductility trade-off via L21 precipitate-strengthening in Al0.3CoCrNiTi0.1 high entropy alloy at room and cryogenic temperatures","authors":"Hamza Iftikhar ,&nbsp;Kanghyun Park ,&nbsp;Yunjong Jung ,&nbsp;Kangjin Lee ,&nbsp;Sung Hwan Hong ,&nbsp;Ki Buem Kim ,&nbsp;Chanho Lee ,&nbsp;Gian Song","doi":"10.1016/j.jmrt.2025.09.184","DOIUrl":"10.1016/j.jmrt.2025.09.184","url":null,"abstract":"<div><div>We developed a novel Al_0.3CoCrNiTi_0.1 high entropy alloy (HEA) comprising of face-centered-cubic (FCC) matrix and the L2₁-Ni₂TiAl precipitates. This alloy exhibits exceptional strength-ductility combinations at both room and cryogenic temperatures. The mechanical properties of this alloy increased when the temperature decreased. For instance, the yield strength, tensile strength and ductility at room temperature were estimated to 556, 1134 MPa and 38 %, while those at cryogenic temperature were measured to 682, 1422 MPa and 36 %, respectively. Theoretical calculation of strengthening mechanisms indicated that the strengthening was mainly dominated by L2₁ precipitates. Detailed investigation of deformation mechanisms through electron back-scattered diffraction (EBSD) and transmission electron microscope (TEM) revealed that the enhanced strain-hardening rate at cryogenic temperatures was associated with the L2₁ precipitates, the reduced SF spacing and SF networks. These findings suggest that the Al_0.3CoCrNiTi_0.1 HEA could provide a promising candidate for advanced cryogenic structural applications.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 933-944"},"PeriodicalIF":6.6,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120948","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":"Strengthening the diffusion bonding of Zr-4 alloys through regulating surface roughness and Ti interlayer thickness","authors":"Yujie Bai ,&nbsp;Zeming Wang ,&nbsp;Hui Chen ,&nbsp;Yuanxing Li","doi":"10.1016/j.jmrt.2025.09.181","DOIUrl":"10.1016/j.jmrt.2025.09.181","url":null,"abstract":"<div><div>The welding of Zr alloys has garnered significant attention within the nuclear industry. In this study, diffusion bonding of Zr-4 alloys was performed at 700 °C/60 min/15 MPa, and effects of substrate surface roughness and Ti interlayer thickness on microstructure and mechanical properties of joints were investigated. Joints without or with Ti interlayers indicated an increase in bonding ratio (or diffusion layer thickness) and shear strength as the surface roughness decreased. Introducing Ti interlayers reduced the dependence on surface roughness and enhanced the joint performance. Moreover, the thickness and uniformity of diffusion layers and shear strength increased as the Ti interlayer thickness decreased. The maximum shear strength of 231 MPa was obtained for the Zr-4/Ti₁₀/Zr-4 joint, 320 % higher than that of the direct joint under the same welding parameters. The fracture surfaces displayed features characteristic of shear bands and dimples, with nearly complete elimination of unbonded regions after decreasing substrate surface roughness or Ti interlayer thickness.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 885-890"},"PeriodicalIF":6.6,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120924","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":"Influence of normalizing temperature on pitting corrosion resistance of 2205/DH36 clad plate: a new mechanism for σ phase induced pitting corrosion","authors":"Jiaxing Cai ,&nbsp;Hongchi Ma ,&nbsp;Dan Guo ,&nbsp;Min Zhu ,&nbsp;Xuequn Cheng ,&nbsp;Wenxiu Yang ,&nbsp;Yi Fan ,&nbsp;Qinqin Dai ,&nbsp;Yunfang Cui ,&nbsp;Xiaogang Li","doi":"10.1016/j.jmrt.2025.09.183","DOIUrl":"10.1016/j.jmrt.2025.09.183","url":null,"abstract":"<div><div>This work investigated the effect of normalization on σ phase precipitation and pitting corrosion resistance of 2205SS clad layer in 2205/DH36 clad plates. Results indicate normalization within 880 °C–920 °C leads to large amount of precipitation of σ phase, seriously deteriorating its pitting corrosion resistance. The pitting corrosion resistance of 2205SS is closely related to the proportion of σ phase. As the normalizing temperature increases from 880 °C to 940 °C, σ phase content gradually decreases with pitting corrosion resistance largely recovered. The significant deterioration in pitting corrosion resistance is attributed to the micro-galvanic corrosion effect induced by σ phase, but not Cr-depletion.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 986-997"},"PeriodicalIF":6.6,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145121293","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":"Effects of layer thickness ratio on deformation coordination and dynamic softening mechanisms of hot-compressed 1060Al/SiC–6061Al/1060Al composites","authors":"Zhijuan Zhang ,&nbsp;Bing Zhang ,&nbsp;Zhaolin Wang ,&nbsp;Zhiqiang Lei ,&nbsp;Shancheng Zhan ,&nbsp;Kuaishe Wang","doi":"10.1016/j.jmrt.2025.09.170","DOIUrl":"10.1016/j.jmrt.2025.09.170","url":null,"abstract":"<div><div>The 1060Al/SiC–6061Al/1060Al laminated particle-reinforced aluminum matrix composites (LPRAMCs) have their deformation behavior affected not only by processing parameters but also significantly by the initial layer thickness ratio of their components. This ratio affects the interface structure, microstructure and mechanical properties of the material by affecting the physical properties and the strain partitioning during the deformation process. In this study, the flow behavior, interfacial structure, hot processing maps, and microstructural evolution of two LPRAMCs, designated as 363 and 444 composites with different layer thickness ratios, were systematically investigated under various deformation conditions via hot compression tests. Additionally, the influence of layer thickness ratio on deformation coordination and recrystallization mechanisms was analyzed. The results revealed that, under all deformation conditions, the 363 composites, which contain a higher proportion of the hard 6061Al–SiC particle-reinforced layer (PR layer), consistently exhibited higher flow stress than the 444 composites. Although the 363 composites displayed superior overall deformation coordination to the 444 composites, the coordinated deformation effect between the component layers in the 444 composites became more evident with increasing distance (i.e., strain) from the center to the edge of the sample. The different component ratios of the composites correspond to different deformation behaviors. The deformation mechanism of the 1060Al layer (Al layer) in the two composites was dominated by dynamic recovery (DRV), accompanied by partial continuous dynamic recrystallization (CDRX), whereas the PR layers primarily underwent CDRX. However, localized geometric dynamic recrystallization (GDRX) was observed in the PR layer of the 444 composite.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 752-770"},"PeriodicalIF":6.6,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120919","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":"Mechanisms of phase strengthening and thermal stabilization in the refractory high-entropy superalloy AlMo0.5NbTa0.5TiZr","authors":"Hongyi Li ,&nbsp;Fuhua Cao ,&nbsp;Tong Li ,&nbsp;Yan Chen ,&nbsp;Haiying Wang ,&nbsp;Lanhong Dai","doi":"10.1016/j.jmrt.2025.09.133","DOIUrl":"10.1016/j.jmrt.2025.09.133","url":null,"abstract":"<div><div>Refractory high-entropy superalloys (RHESs) offer transformative potential for high-temperature applications, but face significant challenges in engineering applications. This study investigates the strengthening mechanisms for different phases and phase stability of the AlMo_0.5NbTa_0.5TiZr RHESs, which features a γ/γ′-like A2/B2 dual-phase nanostructure. Based on Energy-dispersive X-ray spectroscopy (EDS) analysis, the composition of the BCC phase in this RHESs was identified and corresponding alloys were successfully synthesized. Uniaxial compression tests reveal temperature-dependent synergy between BCC and B2 phases: while both phases exhibit near-equal strength contributions at elevated temperatures (600–800 °C), mechanistic analysis revealed distinct origin that the BCC phase derives strength from solid-solution effects dominated by lattice distortions, whereas the B2 phase provides order-strengthening through antiphase boundary energy barrier. Meanwhile, it has been fully demonstrated that incorporating high-modulus and large atomic-size elements (e.g., Mo, Zr, Cr) effectively enhances solid-solution strengthening in single-phase RHEAs. In-situ transmission electron microscopy (TEM) heating experiments uncover rapid coarsening of BCC precipitates driven by spinodal decomposition. The microstructural instability to elemental redistribution was found to be linked to Nb/Ta-Zr miscibility gaps. These findings provide critical guidelines for designing RHEAs suitable for high-temperature engineering applications.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 1232-1242"},"PeriodicalIF":6.6,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159779","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":"Temperature difference-induced surface tension gradients enable high densification of W-30Cu composites via ultrafast high-temperature sintering","authors":"Pengqi Chen ,&nbsp;Chengyang Huang ,&nbsp;Jiarui Su ,&nbsp;Dang Xu ,&nbsp;Hongyu Chen ,&nbsp;Xinyuan Shen ,&nbsp;Jigui Cheng","doi":"10.1016/j.jmrt.2025.09.171","DOIUrl":"10.1016/j.jmrt.2025.09.171","url":null,"abstract":"<div><div>The fabrication of highly dense W-Cu composites using conventional powder metallurgy techniques remains challenging, due to the significant differences in physical properties between tungsten and copper. In this study, micron-sized tungsten powder and spherical copper powder were selected as raw materials to prepare W-30Cu composite powders. Sintering was performed using the ultra-fast sintering (UHS) technique at temperatures ranging from 1050 °C to 1200 °C with holding times of 1, 3, 5, and 10 min. The results reveal that the sample sintered at 1150 °C for 10 min exhibited the highest relative density of 95.4 % and thermal conductivity of 234.2 W m⁻¹ K⁻¹. During the UHS process, the steep thermal gradient induced a surface tension gradient, which promoted the redistribution of the copper liquid phase and the rearrangement of tungsten particles. Compared to conventional tube furnace sintering under uniform temperature fields, this approach significantly enhanced densification and performance within a much shorter time. These findings suggest that the application of UHS provides a promising pathway for the fabrication of advanced composite materials.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"39 ","pages":"Pages 862-872"},"PeriodicalIF":6.6,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145121294","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}