文献类型：期刊文献

英文题名：Tailoring microstructure and tensile properties of low-cost AlCrFeNi-based high-entropy alloys via Co and/or Ti addition

作者：Niu, Jiacheng[1,2];Fu, Zhiqiang[1,2];Chen, Weiping[1,2];Hao, Liangyan[3];Xiong, Wei[3];Lu, Tiwen[4];Wen, Haiming[5]

机构：[1]South China Univ Technol, Guangdong Key Lab Adv Met Mat Proc, Guangzhou 510640, Guangdong, Peoples R China;[2]South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Met Mat, Guangzhou 510640, Peoples R China;[3]Univ Pittsburgh, Dept Mech Engn & Mat Sci, Phys Met & Mat Design Lab, Pittsburgh, PA 15261 USA;[4]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[5]Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65409 USA

年份：2023

卷号：206

外文期刊名：MATERIALS CHARACTERIZATION

收录：;EI(收录号：20234515034095);WOS:【SCI-EXPANDED(收录号:WOS:001111720800001)】；

基金：Jiacheng Niu and Zhiqiang Fu acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 52103360) , the Basic and Applied Basic Research Foundation of Guangdong Province (Grant No. 2023A1515012363) , and from the Pearl River Talent Program (Grant No. 2021QN02C766) . Weiping Chen thanks the financial support from the Key -Area Research and Develop- ment Program of Guangdong Province (Grant No. 2018B090905002) . Liangyan Hao, Wei Xiong, Tiwen Lu and Haiming Wen performed this research without funding support.

语种：英文

外文关键词：High -entropy alloys; Tensile properties; Solidification behavior; Thermodynamic calculation

摘要：Al-Cr-Fe-Ni high-entropy alloys (HEAs) have low cost but suffer from intrinsic brittleness, leading existing research to concentrate on compressive properties. This study explores alloying strategies to improve tensile properties for these HEAs. Minor elements including 5 at.% Co, 5 at.% Co + 3 at.% Ti, and 5 at.% Co + 5 at.% Ti are added to investigate their impact on microstructure, tensile properties, and solidification behavior for Fe30Ni35Cr21.25Al13.75 HEA. The addition of both Co and Ti has a synergistic effect on the alloys; however, it does not alter the types of phases present, as the face-centered cubic (FCC), body-centered cubic (BCC), and B2 phases are maintained. Specifically, the increase of Ti content promotes the transformation of the primary phase from FCC to BCC and causes the BCC phase to undergo spinodal decomposition. The addition of Co alone decreases the strength, whereas the synergistic combination of Co and Ti enhances the yield strength (from-571 MPa to-625 MPa) and ultimate tensile strength (from-1112 MPa to-1288 MPa). Nonetheless, the total elongation is only reduced by 1.5% with this combination. Specially, introducing 5% Ti into the alloy instantly renders it brittle. These results provide valuable insights into improving the mechanical properties and understanding the solidification behavior of low-cost Al-Cr-Fe-Ni HEAs through synergistic alloying.