{"title":"Achieving ultrahigh strength and good ductility in a Al5Co21Fe21Mn17Ni36 high-entropy alloy with BCC and FCC crystals","authors":"M.Z. Wang , Y.F. Shen , W.Y. Xue","doi":"10.1016/j.intermet.2025.108667","DOIUrl":null,"url":null,"abstract":"<div><div>A non-equimolar ratio Al<sub>5</sub>Co<sub>21</sub>Fe<sub>21</sub>Mn<sub>17</sub>Ni<sub>36</sub> HEA is designed, composed of FCC and B2 phases. The ultrahigh yield strength and ultimate tensile strength are achieved at −196 °C, reaching 1100 ± 5 MPa and 1500 ± 10 MPa, respectively, while retaining a considerable ductility of 15 %. During tensile testing, the slip mode of dislocations shifts from cross-slip to planar slip with decreasing temperature from 25 °C to −196 °C due to the nanosized B2 particles. In particular, planar slip is promoted by reducing stacking fault energy at −196 °C, thus effectively promoting the dislocation accumulations around the B2 phase.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"179 ","pages":"Article 108667"},"PeriodicalIF":4.3000,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Intermetallics","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0966979525000329","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
A non-equimolar ratio Al5Co21Fe21Mn17Ni36 HEA is designed, composed of FCC and B2 phases. The ultrahigh yield strength and ultimate tensile strength are achieved at −196 °C, reaching 1100 ± 5 MPa and 1500 ± 10 MPa, respectively, while retaining a considerable ductility of 15 %. During tensile testing, the slip mode of dislocations shifts from cross-slip to planar slip with decreasing temperature from 25 °C to −196 °C due to the nanosized B2 particles. In particular, planar slip is promoted by reducing stacking fault energy at −196 °C, thus effectively promoting the dislocation accumulations around the B2 phase.
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This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys.
The journal reports the science and engineering of metallic materials in the following aspects:
Theories and experiments which address the relationship between property and structure in all length scales.
Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations.
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