Journal of Alloys and Compounds最新文献

{"title":"Superplasticity mechanisms of a near-α titanium alloy: Competition and synergy of grain size and phase ratio","authors":"Lixia Ma, Rui Fan, Tianyu Cui, Dingyong He, Weidong Li, Xiuquan Han, Yunxi Liu","doi":"10.1016/j.jallcom.2026.190854","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190854","url":null,"abstract":"To satisfy the demands for lightweight design and high-temperature mechanical properties, Ti65 alloy has emerged as a promising structural material for critical aero-engine components. This study investigates the superplastic deformation behaviour, microstructure evolution and underlying mechanisms at 890-970°C and 0.0005-0.004<ce:hsp sp=\"0.25\"></ce:hsp>s<ce:sup loc=\"post\">-1</ce:sup>, focusing on the competitive and synergistic effects of grain size and phase ratio evolution on superplasticity. The results indicate that the Ti65 alloy exhibits exceptional superplasticity, achieving elongations exceeding 350% under all tested conditions and over 500% at 890-950°C or 0.0005-0.002<ce:hsp sp=\"0.25\"></ce:hsp>s<ce:sup loc=\"post\">-1</ce:sup>, reaching a peak elongation of 659.2% at 910°C and 0.001<ce:hsp sp=\"0.25\"></ce:hsp>s<ce:sup loc=\"post\">-1</ce:sup>. The strain rate sensitivity exponent (~0.48) and activation energy (~249.4<ce:hsp sp=\"0.25\"></ce:hsp>kJ/mol) analysed at 0.001<ce:hsp sp=\"0.25\"></ce:hsp>s<ce:sup loc=\"post\">-1</ce:sup> confirm grain boundary sliding (GBS) as the dominant deformation mechanism. Microstructural observation reveals that, driven by dynamic strain, the β-phase fraction in the gauge region is significantly higher than that in the grip region, while the primary α grain size is substantially refined through continuous and discontinuous dynamic recrystallization (CDRX and DDRX). The enhanced α→β dynamic phase transformation at higher temperatures and lower strain rates increases the β-phase volume fraction from ~6.5% to ~57.8%, where a β-phase fraction not exceeding 50% helps reduce flow stress and promote GBS by providing more α/β phase interfaces with lower slip resistance. Conversely, as temperature increases and strain rate decreases, both the primary α and β-phase grains grow or even coarsen, leading to a reduction in grain/phase boundary density and subsequent deterioration of superplasticity. The contradictory evolution of grain size and phase volume fraction defines an optimal synergistic processing window, characterized by a β-phase fraction of approximately 10%-25% and an average primary α grain size below ~7.0μm, within which GBS efficiency and intragranular accommodation capability reach an optimal balance.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"17 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883658","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 Enhanced High Temperature Oxidation Behavior of TiC-Reinforced Stellite 6 Metal Matrix Composite Coatings via Laser Cladding Additive Manufacturing","authors":"Vikas Tiwari, Moloy Sarkar, Vijay Mandal, Janakarajan Ramkumar, K. Mondal, Sudhanshu S. Singh","doi":"10.1016/j.jallcom.2026.190820","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190820","url":null,"abstract":"This study systematically examines the microstructural evolution and high-temperature oxidation behaviour of laser-cladded Stellite 6/<ce:italic>x</ce:italic>-TiC (x = 10, 20, 30 vol.%) composite coatings. The addition of TiC has promoted heterogeneous nucleation, suppressed columnar grain growth, and resulted in a refined equiaxed microstructure with random crystallographic orientations. All coatings were subjected to elevated temperatures in ambient conditions under two conditions: (i) isothermal holding at 450 °C, 600 °C, and 750°C for 24<ce:hsp sp=\"0.25\"></ce:hsp>hours, and (ii) prolonged isothermal oxidation at 750 °C for 96<ce:hsp sp=\"0.25\"></ce:hsp>hours to assess oxidation kinetics. A continuous oxide layer with faceted triangular crystals formed in case of Stellite 6 coating, whereas TiC-containing composite coatings predominantly exhibited large blocky-shaped precipitates. The oxide scales of Stellite 6 were primarily composed of Cr-rich oxides and complex Co–Cr oxides. In contrast, MMC coatings additionally showed TiO<ce:inf loc=\"post\">2</ce:inf> phases (anatase and rutile) with anatase dominating at lower temperatures, and rutile stabilizing at higher temperatures. Cross-sectional analysis indicated that formation of average oxide layer thickness decreases from ~7.6<ce:hsp sp=\"0.25\"></ce:hsp>µm (0 vol.% TiC) to ~5.1<ce:hsp sp=\"0.25\"></ce:hsp>µm (30 vol.% TiC) with an improvement reduction by ~33%. Kinetics analysis revealed a decrease in the oxidation power-law exponent from 0.50 for S10 to 0.38 for S30, indicating progressively slower oxidation kinetics with increasing TiC content. The Stellite 6 with a 30 vol.% TiC coating exhibited the highest oxidation resistance, resulting in an ~86.1% reduction in mass gain at 750 °C (for 96<ce:hsp sp=\"0.25\"></ce:hsp>h) compared to Stellite 6, owing to TiC-induced microstructural refinement and an effective diffusion-barrier with stable oxide formation.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"349 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of minor Ta addition on heat-treatment-induced multiphase reconstruction and compressive properties of CoCrNiNb-based high-entropy alloy","authors":"Lifan Chen, Yitong Xu, Bo Li, Da Wu, Cong Li, Xiaohu Hou, Yimin Gao, Xueping Zhao","doi":"10.1016/j.jallcom.2026.190865","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190865","url":null,"abstract":"Minor refractory-element additions can regulate phase reconstruction in CoCrNiNb-based alloys, but their effects on phase persistence and compressive response remain insufficiently resolved. Here, a non-equiatomic CoCrNiNb<ce:inf loc=\"post\">0.4</ce:inf>Ta<ce:inf loc=\"post\">0.1</ce:inf> alloy was arc-melted and annealed at 800-1100 °C for 10<ce:hsp sp=\"0.25\"></ce:hsp>h. Phase evolution, elemental partitioning, interfacial structure and mechanical behavior were examined using thermal analysis, X-ray diffraction, quantitative energy-dispersive X-ray spectroscopy, multiscale electron microscopy and room-temperature compression testing. The as-cast FCC/Laves lamellae underwent diffusion-controlled solid-state reconstruction at 800-1000 °C, forming a σ/HCP/NbNi<ce:inf loc=\"post\">3</ce:inf>-dominated architecture through fishbone-like and butterfly-like intermediates. At 1000 °C, the minimum characteristic interphase spacing (0.148<mml:math altimg=\"si0001.gif\"><mml:mo>±</mml:mo></mml:math>0.037 μm) coexisted with uniformly distributed, approximately spheroidal 7-10 μm reconstructed regions, whereas annealing at 1100 °C caused phase reversion and coarsening. Quantitative compositional analysis revealed preferential Ta partitioning into Nb-rich intermetallic regions, supporting an association with persistence of the reconstructed architecture without implying an independently proven stabilization mechanism. The 1000 °C condition achieved the best response, with a yield strength of 2574<ce:hsp sp=\"0.25\"></ce:hsp>MPa, ultimate compressive strength of 3052<ce:hsp sp=\"0.25\"></ce:hsp>MPa, fracture strain of 19.8% and hardness of 828.6 HV. This performance is interpreted as arising from coupled phase replacement and load sharing, refined interfaces, lattice-strain-assisted dislocation storage, and a possible contribution of the spheroidal regions to yielding and post-yield stress redistribution. These results establish reconstructed-phase topology and interfacial control, rather than maximization of a single hard-phase fraction, as an effective design principle for improving the strength-compressive plasticity balance of compositionally complex alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"13 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883876","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":"Fe,S-codoped g-C3N4/CeO2 S-scheme heterojunction with enhanced photocatalytic peroxymonosulfate activation for efficient antibiotic degradation","authors":"Xin Liu,Yuan Gao,Xueqian Li,Ning Zhou,Jingliang Wang,Yitong Xu,Xinyu Liu,Yiping Zhao,Xia Feng,Li Chen","doi":"10.1016/j.jallcom.2026.190814","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190814","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"164 1","pages":"190814"},"PeriodicalIF":6.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893715","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":"Machine Learning-Assisted Prediction of Microwave Dielectric Properties in High-Entropy Titanate Ceramics","authors":"Zhixing Ren,Pingwen Xiang,Yuanming Lai,Hong Wang,Yao Sun,Lin Xu,Qian Liu,Chongsheng Wu,Yuanxun Li","doi":"10.1016/j.jallcom.2026.190872","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190872","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"7 1","pages":"190872"},"PeriodicalIF":6.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893720","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":"Shear-band dominated compressive failure and compressive response of high strength alumina hollow sphere reinforced Al-Cu matrix syntactic foams","authors":"Lingzhi Xie,Yaopeng Duan,Yongliang Mu","doi":"10.1016/j.jallcom.2026.190856","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190856","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"55 1","pages":"190856"},"PeriodicalIF":6.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893724","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":"Microdiamond Modified MXene Films with Enhanced Thermal Conductivity and Retained Excellent Electromagnetic Interference Shielding Performance","authors":"Qin Tang,Jianuo Qin,Jun Shen","doi":"10.1016/j.jallcom.2026.190851","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190851","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"2 1","pages":"190851"},"PeriodicalIF":6.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893726","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":"Formation of iron chains in co-intercalate materials Cr0.25FexTiSe2 (x = 0.1; 0.2; 0.3; 0.4; 0.5).","authors":"E.G. Shkvarina,A.F. Gubkin,A.N. Titov,I.A. Bobrikov,A.S. Shkvarin","doi":"10.1016/j.jallcom.2026.190909","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190909","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"47 1","pages":"190909"},"PeriodicalIF":6.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced nonlinear absorption in Janus WSSe nanosheets relative to WSe2","authors":"QianHou Liu,Shuangjie Li,Qian Zhang,Fei Xing,Fang Zhang","doi":"10.1016/j.jallcom.2026.190780","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190780","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"10 1","pages":"190780"},"PeriodicalIF":6.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893732","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":"Mechanistic insights into Zr-regulated elastic modulus and passive-film stability of β-type Ti-Nb-Zr alloys in simulated physiological environments","authors":"Bo Peng,Jieren Yang,Jian Mao,Run Li,Chuan Rong","doi":"10.1016/j.jallcom.2026.190220","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190220","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"51 1","pages":"190220"},"PeriodicalIF":6.2,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893934","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}