Intermetallics最新文献_第3页

Improvement of corrosion-wear resistance of Zr-based metallic glass by pre-oxidation treatment 预氧化处理提高zr基金属玻璃的耐蚀磨损性能

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-28 DOI: 10.1016/j.intermet.2025.108897

Yu Zhang , Wenxue Wang , Yong Xiao , Jiang Ma

{"title":"Improvement of corrosion-wear resistance of Zr-based metallic glass by pre-oxidation treatment","authors":"Yu Zhang , Wenxue Wang , Yong Xiao , Jiang Ma","doi":"10.1016/j.intermet.2025.108897","DOIUrl":"10.1016/j.intermet.2025.108897","url":null,"abstract":"<div><div>Zr-based bulk metallic glasses (BMGs) are considered to have broad application prospects due to their superior mechanical properties and excellent glass forming ability (GFA). However, the wear resistance of Zr-based BMGs, especially when exposed to corrosive liquid environments, is insufficient and could decrease their service reliability in special environments. Here, we report a facile method that can significantly enhance the corrosion-wear performance of Zr-based MBGs, termed as pre-oxidation treatment (PT). The key parameters of electrochemical experiments proved that PT samples have a lower tendency to corrosion, the wear rates of the PT samples in 3.5 % NaCl neutral solution and 1N HCl acidic solution were 1.55 × 10<sup>−6</sup> mm<sup>3</sup> N<sup>−1</sup> m<sup>−1</sup> and 0.88 × 10<sup>−6</sup> mm<sup>3</sup> N<sup>−1</sup> m<sup>−1</sup>, respectively, which are significantly lower than those of the As-cast (AC) samples (29.8 × 10<sup>−6</sup> mm<sup>3</sup> N<sup>−1</sup> m<sup>−1</sup> and 44.99 × 10<sup>−6</sup> mm<sup>3</sup> N<sup>−1</sup> m<sup>−1</sup>, respectively). AC and PT samples both experienced synergistic effects of corrosion and mechanical wear, AC samples primarily experienced abrasive, adhesive, fatigue, and minor oxidative wear with corrosive wear. PT samples, with a high-hardness oxide layer, the wear debris and corrosion products could form lubrication, shown better resistance to mechanical wear, making mild abrasive and corrosive wear their main wear mechanisms. Our results demonstrates that PT can significantly enhance the corrosion-wear durability of metallic glasses, thereby unlocking engineering potential in corrosive-service environments.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108897"},"PeriodicalIF":4.3,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502335","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

Effects of Nb addition on the damping capacity and mechanical properties of NbxCoCrFeNi2Al0.3 high-entropy alloys Nb加入对NbxCoCrFeNi2Al0.3高熵合金阻尼性能和力学性能的影响

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-28 DOI: 10.1016/j.intermet.2025.108901

Yaqing Li, Aoxiang Li, Kaiwen Kang, Jinshan Zhang, Di Huang, Chunning Che, Borui Zhang, Saike Liu, Mingkun Xu, Yiteng Jiang, Gong Li

{"title":"Effects of Nb addition on the damping capacity and mechanical properties of NbxCoCrFeNi2Al0.3 high-entropy alloys","authors":"Yaqing Li, Aoxiang Li, Kaiwen Kang, Jinshan Zhang, Di Huang, Chunning Che, Borui Zhang, Saike Liu, Mingkun Xu, Yiteng Jiang, Gong Li","doi":"10.1016/j.intermet.2025.108901","DOIUrl":"10.1016/j.intermet.2025.108901","url":null,"abstract":"<div><div>A comprehensive investigation was conducted on Nb<sub><em>x</em></sub>CoCrFeNi<sub>2</sub>Al<sub>0.3</sub> (<em>x</em> = 0.05, 0.10, 0.15) high-entropy alloys (HEAs), focusing on their phase evolution, microstructural characteristics, damping behavior, and mechanical properties as functions of Nb content. Microstructural analysis confirmed a dual-phase constitution in the alloy system, comprising a face-centered cubic (FCC) matrix as the primary phase with dispersed Laves phase precipitates serving as the secondary phase. As the Nb molar ratio increased from <em>x</em> = 0.05 to 0.15, the volume fraction of the Laves phase exhibited a significant increasing trend, rising from 1.8 vol% to 9.0 vol%. Performance tests demonstrated that the Nb<sub>0.15</sub>CoCrFeNi<sub>2</sub>Al<sub>0.3</sub> alloy exhibited outstanding damping capacity of up to 0.055 at a strain amplitude of 3.2 × 10<sup>−4</sup>, while maintaining excellent mechanical properties. This optimized combination of damping capacity and mechanical properties enables the alloy not only to compete with conventional high-damping alloys but even to surpass them in certain key performance indicators.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108901"},"PeriodicalIF":4.3,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of low-temperature gaseous carburization on mechanical and tribological properties of CoCrFeMnNi high-entropy alloy 低温气体渗碳对CoCrFeMnNi高熵合金力学和摩擦学性能的影响

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-27 DOI: 10.1016/j.intermet.2025.108900

Yawei Peng , Donghui Chen , Yang Yao , Han Duan , Jianming Gong

{"title":"Effect of low-temperature gaseous carburization on mechanical and tribological properties of CoCrFeMnNi high-entropy alloy","authors":"Yawei Peng , Donghui Chen , Yang Yao , Han Duan , Jianming Gong","doi":"10.1016/j.intermet.2025.108900","DOIUrl":"10.1016/j.intermet.2025.108900","url":null,"abstract":"<div><div>This study investigated the effect of low-temperature gas carburization (LTGC) on CoCrFeMnNi high-entropy alloy (HEA), focusing on the associated microstructural evolution, as well as the resulting changes in mechanical and tribological properties. The findings demonstrate that LTGC is an effective surface strengthening treatment for CoCrFeMnNi HEA. After LTGC, a ∼32 μm thick carburized case forms on the alloy surface, characterized by high hardness (∼12.8 GPa) and high compressive residual stress (∼2.5 GPa). This case consists of an expanded FCC phase, which is a carbide-free, supersaturated interstitial solid solution of carbon atoms in the FCC lattice. LTGC exerts limited influence on the macroscopic tensile properties of CoCrFeMnNi HEA, it leads to a modest increase in ultimate tensile strength, with slight reductions in yield strength and elongation. While, LTGC can significantly improves the tribological performance, reducing the volumetric wear rate from 11.4 × 10<sup>−4</sup> to 0.45 × 10<sup>−4</sup> mm<sup>3</sup>/Nm and decreasing the coefficient of friction from 0.51 to 0.49. Additionally, the wear mechanism transitions from a combination of abrasive, adhesive, oxidative, and fatigue wear to a mixed wear mechanism primarily governed by abrasion and oxidation after LTGC.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108900"},"PeriodicalIF":4.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144489776","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

Machine learning for obtaining values of thermomechanical processing parameters of high-entropy alloys with desirable strength and ductility 利用机器学习获得具有理想强度和延展性的高熵合金的热力加工参数值

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-27 DOI: 10.1016/j.intermet.2025.108892

Zolfaghar Ali Akhlaghi , Hamed Shahmir , Ahmad Reza Sharafat

{"title":"Machine learning for obtaining values of thermomechanical processing parameters of high-entropy alloys with desirable strength and ductility","authors":"Zolfaghar Ali Akhlaghi , Hamed Shahmir , Ahmad Reza Sharafat","doi":"10.1016/j.intermet.2025.108892","DOIUrl":"10.1016/j.intermet.2025.108892","url":null,"abstract":"<div><div>Machine learning offers a promising and cost-effective approach to optimize thermomechanical processing and inverse design of high-entropy alloys. To obtain values of thermomechanical processing parameters including thickness reduction during rolling together with post-deformation annealing temperature and time of an equiatomic CoCrFeNiMn high-entropy alloy with desirable strength and ductility, we use neural networks for which and apply data augmentation techniques to enhance learning and performance. Besides, the performance of various other techniques, such as linear regression, k-nearest neighbors, decision trees, and ensemble models (random forest, bagging, gradient boosting, XGBoost, AdaBoost) were compared with that of neural networks. The results show that neural networks achieve superior performance, namely, an average MAPE of 8 % and an average R-squared of 91 %. The neural network was experimentally validated for three samples with target yield strengths of 450 MPa, 650 MPa, and 800 MPa, which resulted in actual values of 415 ± 22 MPa, 620 ± 31 MPa, and 745 ± 38 MPa, respectively, with uniform elongations closely matching the target of 15 %. The results demonstrate the potential of machine learning in neural networks for obtaining the values of processing parameters for high-performance new alloys.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108892"},"PeriodicalIF":4.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144489775","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

Cooling rate effects on microstructure and properties of Al–Cu–Mg–Ag alloys: A comparative study of freeze-casting and resin sand mold casting 冷却速率对Al-Cu-Mg-Ag合金组织和性能的影响：冷冻铸造与树脂砂型铸造的比较研究

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-26 DOI: 10.1016/j.intermet.2025.108898

Bojun Li, Yu Wang, Yuewu Zheng, Hong Xu, Beibei Xie, Hongxing Qin, Hongkui Mao

{"title":"Cooling rate effects on microstructure and properties of Al–Cu–Mg–Ag alloys: A comparative study of freeze-casting and resin sand mold casting","authors":"Bojun Li, Yu Wang, Yuewu Zheng, Hong Xu, Beibei Xie, Hongxing Qin, Hongkui Mao","doi":"10.1016/j.intermet.2025.108898","DOIUrl":"10.1016/j.intermet.2025.108898","url":null,"abstract":"<div><div>This study sought to overcome mechanical property degradation in sand-cast Al-Cu-Mg-Ag alloys by improving the cooling efficiency through frozen sand mold and freeze-ablation casting. The solid solubility and alloy segregation were controlled by the cooling rate to suppress and refine phases and prevent harmful phase formation. The effective control of cooling rates significantly enhanced solidification characteristics. The cooling rates increased to 1 °C/s in frozen sand mold casting and 14 °C/s in freeze-ablation casting compared to 0.5 °C/s in traditional resin sand mold casting, reducing the grain size from 115 to 60 μm. More rapid cooling improved solid solubility and the equilibrium partition coefficient, effectively reducing micro-segregation. The secondary phase size decreased from 9.1 μm to 2.7 μm, and its content reduced from 10.6 J/g to 5.8 J/g. Under high cooling rates, Sc atoms tend to form a supersaturated solid solution, thereby suppressing the precipitation of Sc-rich phases and inhibiting the nucleation of the W phase. The unique microstructure created by rapid cooling promotes phase redissolution and the precipitation of finely dispersed phases during heat treatment, thereby increasing the alloy tensile strength from 430 MPa to 495 MPa. This study introduces a novel process for developing high-performance cast Al-Cu-Mg-Ag alloys by controlling cooling rates to manipulate the microstructure.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108898"},"PeriodicalIF":4.3,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144489774","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

Enhanced microstructure and properties of laser cladding CoCrNi medium-entropy alloy reinforced with W W增强激光熔覆CoCrNi中熵合金的显微组织与性能

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-26 DOI: 10.1016/j.intermet.2025.108895

Xuanze Yang, Meiyan Feng, Changrong Chen, Guofu Lian

{"title":"Enhanced microstructure and properties of laser cladding CoCrNi medium-entropy alloy reinforced with W","authors":"Xuanze Yang, Meiyan Feng, Changrong Chen, Guofu Lian","doi":"10.1016/j.intermet.2025.108895","DOIUrl":"10.1016/j.intermet.2025.108895","url":null,"abstract":"<div><div>To explore the regulatory mechanism of the W element on the microstructure properties of laser cladding CoCrNi medium-entropy alloy, CoCrNiW<em>x</em> (<em>x</em> = 0, 0.15, 0.3, 0.45, 0.6) medium-entropy alloy coatings with a gradient change in W content were fabricated on an AISI 1045 steel substrate. The microstructure of the coating shows that when <em>x</em> = 0, the coating presents a single FCC solid solution structure. When <em>x</em> > 0, μ phase intermetallic compounds precipitated in the coating, forming a biphase structure of FCC + μ phase. Microhardness testing revealed an upward trend in the microhardness of the CoCrNiW<em>x</em> coatings with increasing W content. Specifically, the W<sub>0.6</sub> coating has the highest average microhardness, attaining 351.59 HV<sub>0.5</sub>, which is 1.84 times that of the W<sub>0</sub> coating. The wear resistance of the coatings is significantly improved with the addition of W. The average friction coefficient decreases from 0.774 to 0.598, and the wear volume reduces from 0.0673 to 0.0237 mm<sup>3</sup>. The wear mechanisms mainly include adhesive wear, abrasive wear, accompanied by oxidative wear. Electrochemical tests conducted in a 3.5 wt% NaCl solution demonstrated that W<sub>0.6</sub> has the highest self-corrosion potential (−0.460 V) and the lowest self-corrosion current (7.245 × 10<sup>−7</sup> A/cm<sup>2</sup>), displaying optimal passivation behavior in the electrolyte. The research results provide a reference for the development of medium-entropy alloy coatings with excellent comprehensive properties.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108895"},"PeriodicalIF":4.3,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481805","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

Preparation of the nano-spherical eutectic Mg2Si in Ca-Sb modified Al-12Mg2Si alloy by sub rapid solidification 亚快速凝固法制备Ca-Sb改性Al-12Mg2Si合金中纳米球状共晶Mg2Si

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-25 DOI: 10.1016/j.intermet.2025.108894

Hong-Chen Yu , En-Ping Zhou , Qing-Peng Wang , Di-Tian Pei , Chen-Xuan Tang , Hui-Lin Suo , Yong-Hao Tian

{"title":"Preparation of the nano-spherical eutectic Mg2Si in Ca-Sb modified Al-12Mg2Si alloy by sub rapid solidification","authors":"Hong-Chen Yu , En-Ping Zhou , Qing-Peng Wang , Di-Tian Pei , Chen-Xuan Tang , Hui-Lin Suo , Yong-Hao Tian","doi":"10.1016/j.intermet.2025.108894","DOIUrl":"10.1016/j.intermet.2025.108894","url":null,"abstract":"<div><div>Spherical eutectic Mg<sub>2</sub>Si with particle size of ∼200 nm is prepared in 0.5 wt% Ca-Sb modified Al-12Mg<sub>2</sub>Si alloy by sub rapid solidification (SRS) method for the first time. High cooling rate during SRS process promotes the nucleation of the eutectic Mg<sub>2</sub>Si and the particle size is decreased. The uniform adsorption of the modifier atom (Ca and Sb atom) on the {100} facet of eutectic Mg<sub>2</sub>Si results in the isotropic growth of the eutectic Mg<sub>2</sub>Si, nano-spherical eutectic Mg<sub>2</sub>Si is formed. The formation of nano-spherical eutectic Mg<sub>2</sub>Si leads to the increasing of the fracture stress (σ<sub>c</sub>) and smooth slip of the dislocation in the α-Al matrix. The ultimate tensile strength (UTS) is increased from ∼196 MPa (unmodified alloy at conventional solidification (CS) condition) to ∼270 MPa (Ca-Sb modified alloy at SRS condition). The elongation to failure of is also improved from ∼2.2 % (unmodified alloy at CS condition) to ∼10 % (Ca-Sb modified alloy at SRS condition). The study provides a method to regulate the size and morphology of eutectic Mg<sub>2</sub>Si, which is beneficial to prepare the novel Al-Mg<sub>2</sub>Si alloy with high strength and toughness.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108894"},"PeriodicalIF":4.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Achieving superplasticity in TiAl alloy via one-step powder metallurgy 一步粉末冶金法实现TiAl合金的超塑性

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-25 DOI: 10.1016/j.intermet.2025.108899

Hao Chen , Zhenxin Duan , Yuxin Shen , Liping Liu , Huiliang Shao , Xiaolei Song , Ying Han

引用次数: 0

Investigate on the mechanism of Nb and Ti element doping to enhance the stress rupture life of high-tungsten superalloy 探讨了铌、钛元素掺杂提高高钨高温合金应力断裂寿命的机理

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-25 DOI: 10.1016/j.intermet.2025.108890

Xiang Fei , Naicheng Sheng , Chen Wang , Shijie Sun , Jinjiang Yu , Guichen Hou , Jinguo Li , Yizhou Zhou , Xiaofeng Sun

{"title":"Investigate on the mechanism of Nb and Ti element doping to enhance the stress rupture life of high-tungsten superalloy","authors":"Xiang Fei , Naicheng Sheng , Chen Wang , Shijie Sun , Jinjiang Yu , Guichen Hou , Jinguo Li , Yizhou Zhou , Xiaofeng Sun","doi":"10.1016/j.intermet.2025.108890","DOIUrl":"10.1016/j.intermet.2025.108890","url":null,"abstract":"<div><div>The effect of Nb and Ti on the microstructure and stress rupture life of high tungsten superalloy was studied experimental characterization and theoretical calculation. Referring to the existing high-tungsten superalloys, the phase composition of different Nb as well as Ti contents was calculated and counted by Thermo-Calc calculation. Both the Nb and Ti contents were decided to be 1.8 wt % and 0.8 wt %, respectively, as the addition amount of Nb and Ti in this experiment. The experimental results revealed that the addition of Nb and Ti promoted the increase of MC carbides as well as γ′-phase area fraction, and the stress rupture life (1100 °C/70 MPa) with1.8Nb0.8Ti is nearly 7.5 times higher than that of alloy with 0Nb0Ti. The crack of the alloy with 0Nb0Ti were found to initiate at MC carbides and extend along grain boundary, and eventually fractured. The addition of Nb and Ti reduced the W content in MC carbide and improved the coordinated deformation ability between MC carbide and γ phase, the initiation of the crack was difficult to occur at γ/γ′ interface. Through the first-principles calculation, the elastic modulus of γ′-Ni<sub>3</sub> (Al<sub>0.5</sub>Nb<sub>0.25</sub>Ti<sub>0.25</sub>) phase with the addition of Nb and Ti is obviously increased, which obviously enhance the deformation resistance ability of γ′ phase, and dislocations were not easy to shear into the interior of γ′ phase and form dislocation network with high density at interface of γ/γ′ phases, substantially improving the stress rupture life. The experimental results and in-depth analysis provided theoretical reference and support for the future high tungsten superalloys design.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108890"},"PeriodicalIF":4.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144471753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Achieving strength-ductility synergy in HIP-CoCrFeNiMn high-entropy alloys via rolling and annealing 通过轧制和退火实现HIP-CoCrFeNiMn高熵合金的强度-塑性协同效应

IF 4.3 2区材料科学

Intermetallics Pub Date : 2025-06-25 DOI: 10.1016/j.intermet.2025.108893

Jiahao Liu , Dianchun Ju , Jing Zhang , Yuji Cheng , Lida Che , Xiangyang Li , Zhoujin Lv , Zhanfang Wu

{"title":"Achieving strength-ductility synergy in HIP-CoCrFeNiMn high-entropy alloys via rolling and annealing","authors":"Jiahao Liu , Dianchun Ju , Jing Zhang , Yuji Cheng , Lida Che , Xiangyang Li , Zhoujin Lv , Zhanfang Wu","doi":"10.1016/j.intermet.2025.108893","DOIUrl":"10.1016/j.intermet.2025.108893","url":null,"abstract":"<div><div>Although the rolling-annealing process has been widely employed to tailor the microstructure and mechanical properties of high-entropy alloys, an optimal balance between strength and ductility has yet to be achieved. A deeper understanding of how different rolling modes and deformation levels affect recrystallization behavior and mechanical performance is essential for optimizing processing strategies. In this study, CrMnFeCoNi high-entropy alloys (HEAs) were fabricated by hot isostatic pressing, and the effects of the rolling annealing process on the microstructural evolution and mechanical properties of the alloys were systematically investigated. The results show that the prior particle boundaries (PPBs), composed of oxides, significantly influence the recrystallization behavior of the heavily cold-rolled CrMnFeCoNi HEAs. After annealing, the cold rolled large deformation specimen exhibited a highly inhomogeneous grain size distribution, with fine grains concentrated near the PPBs, accompanied by high kernel average misorientation values. Transmission electron microscopy revealed the presence of high-density dislocations and nanoscale secondary phases in these regions. In contrast, the hot-rolled specimens exhibited a higher fraction of twin boundaries, indicating more complete recrystallization. Mechanical testing demonstrated that the annealed CR75 % (75 % cold rolling reduction) specimen possessed the best combination of strength and ductility (Tensile strength: 782 MPa, Uniform elongation:34.9 %), which can be attributed to the synergistic effects of grain refinement, secondary phase strengthening, and dislocation strengthening. This study underscores the critical role of microstructural heterogeneity in tuning the properties of HEAs and provides a theoretical basis for their microstructural optimization.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108893"},"PeriodicalIF":4.3,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144471755","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