Journal of Alloys and Compounds最新文献

{"title":"Achieving high strength and ductility in a CoCrFeNiMn0.75Cu0.25 high entropy alloy via heterogeneous structure design","authors":"Wujing Fu ,&nbsp;Jingwei Ren ,&nbsp;Guohua Fan ,&nbsp;Xuewen Li ,&nbsp;Yongjiang Huang ,&nbsp;Jianfei Sun","doi":"10.1016/j.jallcom.2025.181279","DOIUrl":"10.1016/j.jallcom.2025.181279","url":null,"abstract":"<div><div>Heterostructuring is an effectively strategy for overcoming strength-ductility trade-off of high entropy alloys (HEAs). In this study, a non-equiatomic CrFeCoNiMn_0.75Cu_0.25 HEA, consisting of bimodal grain structures, nano-sized precipitates/ twins, and sub-grains, was fabricated by a combination of severe plastic deformation (rolling and laser shock peening) followed by annealing. It was demonstrated that the HG structured HEAs exhibits an excellent combination of high yield strength (∼1.03 GPa) and high plasticity (∼15 %) compared to homogeneous structured alloys. Here, the enhanced twining, bimodal grains and precipitation activity contribute to significant mechanical incompatibility, which in turn promotes the hetero-deformation-induced strengthening. As a result, the heterogeneous HEA exhibited excellent mechanical properties. This approach is both straightforward and effective for enhancing the mechanical properties of HEAs, presenting a new avenue for the design of heterostructured alloys with superior strength and ductility.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1033 ","pages":"Article 181279"},"PeriodicalIF":5.8,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144164962","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":"Hot deformation behaviors and microstructure evolution of Mg-RE composite with trace titanium particles addition","authors":"Yitao Wang, Jianbo Li, Xu Chen, Rui Hong, Xianhua Chen, Kaihong Zheng, Fusheng Pan","doi":"10.1016/j.jallcom.2025.181151","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181151","url":null,"abstract":"The uniaxial hot compression experiments of Ti/Mg-9Gd-4Y-1Zn-0.5Mn (wt.%) composites were carried out by using a Gleeble-3800 thermo-mechanical simulator at temperatures ranging from 350-500<!-- --> ^oC and strain rates between 10^-3 and 1<!-- --> <!-- -->s^-1. Arrhenius constitutive model was developed for Ti/Mg composite, demonstrating strong predictive accuracy for flow stress with a value of ARRE% = 10.79% and a correlation coefficient (<em>R</em>^<em>2</em>) of 0.9911. The study thoroughly analyzes the relationship between grain structure and the deformation parameters, integrating microstructural characterization. From EBSD analysis, the results indicate that as lnZ decreases, the number of dynamic recrystallization (DRX) grain number increases, resulting in a shift from the &lt;0001&gt;//CD orientation to a more random distribution, which reduces the overall texture intensity. SEM and TEM observations further confirm that a decrease in lnZ leads to the subdivision of coarse deformed grains and the reduction of kink bands within long-period stacking ordered (LPSO) phases. The kink bands of the 14H-type LPSO phase and Ti-induced particle-stimulated nucleation (PSN) play a pivotal role in enhancing recrystallization and improving formability. These results highlight the significant contribution of Ti reinforcements in the deformation behavior and microstructural evolution of Ti/VW94 composites.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"58 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154078","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":"Investigation of surface engineering on single-crystal NCM613 cathode through Eu2O3 coating to enhance performances","authors":"Zhuang Wang, Xiangyun Qiu, Jilei Du, Rui Wu, Zhenhua Feng, Haiyu Wang, Xiangxin Guo","doi":"10.1016/j.jallcom.2025.181257","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181257","url":null,"abstract":"The medium- and high-nickel layered cathode material LiNi_<em>x</em>Co_<em>y</em>Mn_<em>z</em>O₂ (<em>x+y+z =</em> 1, <em>x</em> ≥ 0.5) has garnered significant research attention due to its high capacity and low cost. However, high-nickel ternary materials inevitably suffer from issues such as Li⁺/Ni²⁺ cation mixing, poor cycling stability, and inferior thermal stability. Even for medium-nickel ternary materials, enhancing specific capacity by increasing the charging cutoff voltage, they also undergo irreversible phase transformation when subjected to high-voltage conditions, leading to capacity degradation. In this study, single-crystal LiNi_0.6Co_0.1Mn_0.3O₂ (NCM613) cathode material is synthesized via the molten salt method, and Eu₂O₃ coating layers with varying amounts are introduced to investigate their effects on electrochemical performance. Electrochemical tests conducted at 25 °C within an operating voltage spanning from 2.75 to 4.5<!-- --> <!-- -->V demonstrated that the 1<!-- --> <!-- -->wt% coated material exhibits optimal discharge specific capacity of 181.39<!-- --> <!-- -->mAh/g at 0.1<!-- --> <!-- -->C current density, as well as improves the cyclic performance by about 5% and shows excellent rate performance. The influence of the structure, morphology, and surface characteristics of the coating layers on the electrochemical and kinetic properties of the material are studied by XRD, SEM, TEM, XPS, and EIS. Furthermore, SEM characterization after 500 cycles reveals that the coated material can effectively inhibit material breakage. In conclusion, the incorporation of Eu₂O₃ as a surface coating demonstrates significant enhancement in the electrochemical behavior of single-crystal NCM613 cathode material.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144164972","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":"The unique evolution of HfC during laser powder bed fusion manufacturing W-HfC alloys and its influence on the microstructure and mechanical properties","authors":"Jianning Gan, Yiming Li, Yunfeng Feng, Rongpei Wang, Keyang Li, Zhiqing Xu, Mengda Hou, Ruoyu Qi, Ming Zhao, Xiaobo Han, Jingyuan Zhang, Yuehuan Li, Feng Lin, Daming Zhuang, Hao Chen, Qianming Gong","doi":"10.1016/j.jallcom.2025.181276","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181276","url":null,"abstract":"Relatively low density, columnar crystal structure and cracks are always the inevitable hurdles in achieving excellent mechanical performance for tungsten (W) or tungsten alloys manufactured by laser powder bed fusion (LPBF) process. In this work, HfC particles were introduced to tungsten (W) to investigate their influence on cracking inhibition and mechanical properties of W alloys. Particularly, possible reactions and evolution of HfC particles during the LPBF process were analyzed thermodynamically. It was found that Hf and C, decomposed from HfC, would enter into W lattice to form substitution solid solution and reacted with W to form tungsten carbides during the cooling process, acting as the wall of cellular structure. Meanwhile, the added micron-sized HfC particles went through melting, re-solidification to regenerate during the LPBF process. Microstructure examination indicated that the crystallographic orientation relationship between re-generated nano-sized HfC nanoparticles and W matrix was (200)&lt;sub&gt;HfC&lt;/sub&gt; // (110)&lt;sub&gt;W&lt;/sub&gt; and [0&lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;&amp;#x305;&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.317ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -896.2 500.5 997.6\" width=\"1.162ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-31\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(29,189)\"&gt;&lt;text font-family=\"STIXGeneral,'Arial Unicode MS',serif\" stroke=\"none\" transform=\"scale(55.199) matrix(1 0 0 -1 0 0)\"&gt;̅&lt;/text&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;̅&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;̅&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;1]&lt;sub&gt;HfC&lt;/sub&gt; // [001]&lt;sub&gt;W&lt;/sub&gt; due to the small lattice mismatch and low interface energy between them. Mitigated thermal stress and uniformly dispersed carbide particles not only suppressed cracking but also refined the grains from 47.0 μm to 34.6 μm and altered columnar crystal structure with weakened &lt;111&gt; // BD texture. Together with solid solution strengthening, the maximum compressive strength of W-HfC alloys reached 1832 MPa. The elucidation about the evolution of carbide particles during the LPBF process may provide an applicable strategy for a reasonable carbide strengthening phase for W alloys based on lattice matchin","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"17 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144164982","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":"Improved Photoelectric Performance of Cs₂AgSbBr₆ Photodetectors via Bismuth and Cobalt Co-doping for Rapid Light Detection","authors":"Yili Liu, Beili Pang, Lingyi Kong, Zhenjiang Du, Wenzhe Dong, Hongzhou Dong, Jianguang Feng, Liyan Yu, Lifeng Dong","doi":"10.1016/j.jallcom.2025.181267","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181267","url":null,"abstract":"Recent advancements in photodetector technology have significantly improved device performance and stability. In this study, we developed a high-performance double perovskite photodetector based on Cs₂AgSbBr₆ through systematic bismuth and cobalt co-doping. Initially, bismuth doping was optimized, with Cs₂AgSb_1-xBi_xBr₆ (x=0.35) demonstrating superior optoelectronic properties, including an On/Off ratio of 94.36 and fast response times (decay time = 5.98 ms, rise time = 8.88 ms). The enhanced crystallinity of the perovskite film, attributed to Bi³⁺ incorporation, facilitated improved carrier generation and transport. Building upon this optimized structure, bismuth-cobalt co-doping was introduced to further refine energy level alignment within the device. The co-doped Cs₂AgSb_1-x-yBi_xCo_yBr₆ (x=0.35, y=0.03) photodetector exhibited a significantly On/Off ratio of 117.98 and even faster response times (decay time = 1.96 ms, rise time = 4.51 ms). Characterization and electrochemical analysis revealed that co-doping improved film morphology, crystal quality, and carrier transport efficiency. Moreover, the stable crystal structure of the optimized films contributed to the device’s excellent overall performance. These findings highlight the effectiveness of elemental doping strategies in enhancing perovskite photodetectors, offering a promising approach for next-generation optoelectronic devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"25 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144165041","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":"Achieving high strength via significantly enhanced precipitation strengthening in Mg-5Bi-3Al-xSn alloys","authors":"Hongrui Li, Zhirou Zhang, Chao Xu, Yafei Liu, Lifeng Jiang, Shuo Ying, Huijun Kang, Zongning Chen, Enyu Guo, Tongmin Wang","doi":"10.1016/j.jallcom.2025.181269","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181269","url":null,"abstract":"High strength is a primary objective in developing low-cost Mg-Bi-Al alloys. This study fabricates new Mg-5Bi-3Al-<em>x</em>Sn (wt.%, <em>x</em> = 0, 1, 3 and 5) alloys possessing high mechanical strength after extrusion. In as-extruded alloys, grains are gradually refined with increasing Sn content. Trace Sn (1<!-- --> <!-- -->wt.%) promotes dynamic recrystallization, but a further increase in Sn content inhibits this process, and subsequently leads to weakening and strengthening of texture. Experimental results and density-functional theory calculations suggest that Bi atoms replace Sn atoms in Mg₂Sn phase and promote precipitation of Mg₂Sn phase, and Mg₂Sn gradually becomes one of the main strengthening phases. Tensile tests demonstrate that yield strength and ultimate tensile strength increase progressively with Sn content. As-extruded Mg-5Bi-3Al-5Sn alloy exhibits increments of 72<!-- --> <!-- -->MPa in yield strength and 63<!-- --> <!-- -->MPa in ultimate tensile strength compared to as-extruded Mg-5Bi-3Al alloy, which reaches 384 and 400<!-- --> <!-- -->MPa, respectively. Fine-grained structure and massive uniformly distributed nano precipitates are mainly responsible for high performance. This work offers new insights for optimizing Mg-Bi-Al alloy composition to develop high-strength Mg alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"5 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144164988","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":"Synergetic improvement of robustness-oxidation resistance integration with strong microwave absorption in Cf/HfB2-SiC(Hf, rGO) composite PDCs for hypersonic vehicle components","authors":"Siqi Lan, Wenyan Huang, Zhichao Xue, Yeqi Zhu, Shengjian Mao, Rongdan Lei, Jiahua Zhan, Ruyin Zhao, Rongqian Yao","doi":"10.1016/j.jallcom.2025.181268","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181268","url":null,"abstract":"High-temperature oxidation resistance and reliability are crucial for thermal protection system (TPS) materials of hypersonic vehicles. Furthermore, the swift development of aerospace industry pushes developments for multi-functional materials to achieve balanced integration in light weight, high strength, thermal insulation/isolation, and electromagnetic (EM) wave absorption. Herein, HfB₂-SiC(Hf_b, rGO) PDCs were fabricated by re-pyrolyzing ball-milling blends of Hf-modified fillers/precursors with 30<!-- --> <!-- -->wt.% HfB₂. The products with promoted phase compatibility exhibit good mechanical performances, owing to Hf-containing structure like HfOSi. The best combination of fillers/precursors are chosen to construct C_{f(<em>x</em>)}/SiO₂-HfB₂-SiC(Hf_b, rGO) PDCs to further enhance load bearing capacity. By adjusting the initial C_f length to 2<!-- --> <!-- -->mm, compressive strength and flexural strength of the material are increased to 264.44<!-- --> <!-- -->MPa and 83.70<!-- --> <!-- -->MPa respectively, owing to energy dissipation mechanism including crack deflection, fiber breakage, and fiber pull-out. Notably, the sample maintains stable structure and good mechanical performances after 60<!-- --> <!-- -->min oxidation under 1300 °C butane torch flame, with hardness of 5.32<!-- --> <!-- -->GPa and fracture toughness of 4.80<!-- --> <!-- -->MPa⋅m^1/2. Formation of self-healing HfO₂(HfSiO₄)-SiO₂-B₂O₃ continuous layer timely seals the small cracks and pores left by oxidation of C_f, restrains catastrophic oxidation inside. More interestingly, HfB₂-SiC(Hf_b, rGO) PDCs doped by Co nanopowders exhibit excellent EM wave absorption capacity especially at the thickness of 1.5<!-- --> <!-- -->mm with the maximum effective absorption bandwidth (EAB_max) of 4.04<!-- --> <!-- -->GHz (13.04-17.44<!-- --> <!-- -->GHz) and corresponding minimal reflection loss (RL_min) of -40.03<!-- --> <!-- -->dB. This work provides a new idea to realize multi-functional application of materials with similar components for TPS in aerospace field.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"25 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154077","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":"Singlet oxygen dominated aqueous contaminant remediation by CoZn-ZIF-derived Co-ZnO in visible light/peroxymonosulfate system","authors":"Xinyu Wang, Tianren Li, Chunrui Zhao, Zian Fang, Mingyu Li","doi":"10.1016/j.jallcom.2025.181265","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181265","url":null,"abstract":"The selective conversion of peroxymonosulfate (PMS) to singlet oxygen (¹O₂) critically depends on precise electronic structure engineering of the catalysts. The PMS electron-donating pathway enables ¹O₂ generation, but the high energy barriers associated with the initial intermediate *SO₅^•− formation result in an unsatisfactory ¹O₂ yield. Herein, Co-doped ZnO was designed by calcination of zeolitic imidazolate framework. Co doping significantly improved the visible-light response, enhanced the photogenerated carrier separation and migration of ZnO, and increased the ZnO valence band potential. These effects promoted the electron-donating reaction of PMS to produce ¹O₂. The optimized Co-ZnO-3/vis/PMS system exhibited a 27.2-fold higher methylene blue degradation rate constant (k = 0.9871<!-- --> <!-- -->min⁻¹) with 43.7% total organic carbon removal within 5<!-- --> <!-- -->min. In addition, the developed ¹O₂-dominated oxidation system removed 83.1% of chromaticity, 59.9% of total phenol, and 24.8% of chemical oxidation demand from the coking wastewater tailwater. This work provides a pathway for tailoring ¹O₂-dominated reactive species for contaminant removal, providing a theoretical guideline for the deep treatment of coking wastewater tailwater.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"83 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154079","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":"Achieving High Coercivity and Magnetic Energy in Nd-Fe-B Magnets via Combined Dual-Alloy and Grain Boundary Diffusion Using Tb₈₆Al₇Co₇","authors":"Liwei Liang, Xiaowei Pan, Xuanang Xu, Bin Wang, Bin Cao, Pengfei Ma, Renhui Liu, Haifeng Wang","doi":"10.1016/j.jallcom.2025.180917","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180917","url":null,"abstract":"The dual-alloy approach has been recognized for its efficacy in optimizing grain boundary (GB) distribution within Nd-Fe-B magnets, which in turn enhances their magnetic properties. In this study, we introduce a novel approach that combines a Nd/Cu-rich dual-alloy with a Tb₈₆Al₇Co₇ grain boundary diffusion process (GBDP) to fabricate sintered Nd-Fe-B magnets with improved coercivity (<em>H</em>_cj) and magnetic energy ((<em>BH</em>)_max). The synergistic effect of the dual-alloy and GBDP resulted in a significant increase in coercivity from 1524.34 to 2532.87<!-- --> <!-- -->kA/m, and a minimal reduction in (<em>BH</em>)_max (0.6%) compared to the traditional method (1.6%). Microstructural analysis revealed that the Nd/Cu-rich dual-alloy treatment led to the enrichment of Nd and Cu at the GBs, forming RE₆Fe₁₃Cu phases. This enrichment dilutes the Fe content at the GBs and decouples the exchange interaction between grains. Additionally, the presence of Cu during the dual-alloy process promotes the transformation of GBs from the hexagonal <em>h</em>-RE₂O₃ to the cubic <em>c</em>-RE₂O₃ phase, which aligns better with the matrix grains. The optimized GBs facilitate the subsequent diffusion of Tb during GBDP, contributing to the remarkable enhancement of coercivity. Furthermore, the incorporation of Nd during the dual-alloy process tends to form a new Nd₂Fe₁₄B phase around the matrix grains, which results in an increase in magnetic energy ((<em>BH</em>)_max). This research presents a promising method for the preparation of Nd-Fe-B permanent magnets with high coercivity and high magnetic energy, offering significant potential for applications in various industrial sectors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"40 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144164980","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":"Abnormal positive dependence of shape memory effect on amount of α phase in a ductile Cu-Al-Mn alloy","authors":"Yinqiang Huang, Jiangqi Lu, Yongning Wang, Wei He, Li Cai, Huabei Peng, Yuhua Wen","doi":"10.1016/j.jallcom.2025.181253","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181253","url":null,"abstract":"Precipitation of ductile α phase can generally improve the ductility of Cu-based shape memory alloys but impair their shape memory effect (SME). An abnormal positive dependence on amount of the α phase was reported in both conventional Cu-Zn-Al and ductile Cu-Al-Mn alloys. To clarify reason for this abnormal dependence, we systematically investigated relationship between the martensitic transformation behavior and the amount of α phase in a ductile Cu-17.5Al-9.4Mn alloy. The results revealed that the occurrence of martensitic stabilization due to slow heating could rationalize the abnormal dependence. The reduced amount of stabilized martensites was proportional to the amount of α phase. An inverse dependence of SME on the M_s temperature existed in the ductile Cu-Al-Mn alloys, regardless of the intrusion of α phase.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"58 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144164983","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}