{"title":"铼合金强化韧性耐火高熵合金","authors":"Xichen Zhou , Qianyong Zhu , Xiao Liang , Qihan Jia , Cheng Zhang , Shiteng Zhao , Hongbo Guo","doi":"10.1016/j.scriptamat.2024.116464","DOIUrl":null,"url":null,"abstract":"<div><div>Strengthening alloys at both ambient and elevated temperatures without compromising room temperature ductility remains a significant challenge in the structural materials field. Recently, we reported a ductile NbTaTi-based refractory high-entropy alloy (RHEA) capable of maintaining high strength up to 1200°C. In this study, we demonstrate that adding 1 at. % Re to this alloy provides further strengthening while preserving excellent cold machinability. Additionally, microstructure optimization was achieved through partial recrystallization, resulting in a heterogeneous lamella structure with alternating coarse and fine grain layers. This optimized structure further enhances the alloy's room temperature tensile strength, exceeding 1 GPa with uniform elongation above 10%. The designed alloy also retains a high strength of nearly 150 MPa at 1300°C. Our findings demonstrate that Re alloying is an effective strategy for improving the mechanical properties of NbTaTi-based RHEAs.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"257 ","pages":"Article 116464"},"PeriodicalIF":5.3000,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Rhenium alloying strengthens a ductile refractory high entropy alloy\",\"authors\":\"Xichen Zhou , Qianyong Zhu , Xiao Liang , Qihan Jia , Cheng Zhang , Shiteng Zhao , Hongbo Guo\",\"doi\":\"10.1016/j.scriptamat.2024.116464\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Strengthening alloys at both ambient and elevated temperatures without compromising room temperature ductility remains a significant challenge in the structural materials field. Recently, we reported a ductile NbTaTi-based refractory high-entropy alloy (RHEA) capable of maintaining high strength up to 1200°C. In this study, we demonstrate that adding 1 at. % Re to this alloy provides further strengthening while preserving excellent cold machinability. Additionally, microstructure optimization was achieved through partial recrystallization, resulting in a heterogeneous lamella structure with alternating coarse and fine grain layers. This optimized structure further enhances the alloy's room temperature tensile strength, exceeding 1 GPa with uniform elongation above 10%. The designed alloy also retains a high strength of nearly 150 MPa at 1300°C. Our findings demonstrate that Re alloying is an effective strategy for improving the mechanical properties of NbTaTi-based RHEAs.</div></div>\",\"PeriodicalId\":423,\"journal\":{\"name\":\"Scripta Materialia\",\"volume\":\"257 \",\"pages\":\"Article 116464\"},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2024-11-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Scripta Materialia\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1359646224004998\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Scripta Materialia","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1359646224004998","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Rhenium alloying strengthens a ductile refractory high entropy alloy
Strengthening alloys at both ambient and elevated temperatures without compromising room temperature ductility remains a significant challenge in the structural materials field. Recently, we reported a ductile NbTaTi-based refractory high-entropy alloy (RHEA) capable of maintaining high strength up to 1200°C. In this study, we demonstrate that adding 1 at. % Re to this alloy provides further strengthening while preserving excellent cold machinability. Additionally, microstructure optimization was achieved through partial recrystallization, resulting in a heterogeneous lamella structure with alternating coarse and fine grain layers. This optimized structure further enhances the alloy's room temperature tensile strength, exceeding 1 GPa with uniform elongation above 10%. The designed alloy also retains a high strength of nearly 150 MPa at 1300°C. Our findings demonstrate that Re alloying is an effective strategy for improving the mechanical properties of NbTaTi-based RHEAs.
期刊介绍:
Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.