Unveiling the precipitation behavior and mechanical properties of Co-free Ni_(47-x)Fe_(30)Cr_(12)Mn_(8)Al_(x)Ti_(3) high-entropy alloys

作     者：Jiantao Fan Liming Fu Yanle Sun Feng Xu Yi Ding Mao Wen Aidang Shan Jiantao Fan;Liming Fu;Yanle Sun;Feng Xu;Yi Ding;Mao Wen;Aidang Shan

作者机构：School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Shanghai Key Laboratory of High Temperature Materials and Precision FormingShanghai Jiao Tong UniversityShanghai200240China Baowu Special Metallurgy Co.LtdShanghai200940China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第118卷第23期

页      面：25-34页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Major Science and Technology Project of China (No. 2014ZX07214-002) the National Natural Science Foundation of China (No. 52001201) 

主　　题：High-entropy alloys Microstructures Precipitation behavior Mechanical properties 

摘      要：Precipitate hardening is considered as an effective method to strengthen High-and medium-entropy alloys(HEAs and MEAs),especially the recently developed Co-free HEAs/MEAs,In this work,a systematic study on precipitation and mechanical behaviors of a Co-free HEAs with dilute amount of Al addition,Ni_(47-x)Fe_(30 C)r_(12)Mn_(8) Al_(x)Ti_(3)(x=2 at.%,5 at.% and 7 at.%),is *** shown that the Ni_(45)Fe_(30)Cr_(12)Mn_(8) Al_(2) Ti_(3) has a face-centered cubic(FCC)+L1_(2)+η three-phased *** increasing Al content,the formation of η phase is inhibited,accompanying with an enhanced formation of B2 phase,and FCC+L1_(2)+B2 three-phased structure is thus observed in alloys with x=5 and *** constrained lattice mismatch between FCC matrix and L1_(2) precipitates is decreased with increasing Al content,leading to an enhanced precipitation behavior of L1_(2) *** a result of microstructural evolution,the mechanical properties of the aged HEAs changed:the Ni_(42)Fe_(30)Cr_(12)Mn_(8) Al_5 Ti_(3) alloy exhibits a better combination of a yield strength of 661 MPa and tensile ductility of 29.7% as compared to the 2 at.% Al alloyed HEA;and addition of Al beyond 5 at.% results in an increase of strength with a large expense of *** believe that the present work is helpful for developing high-performance Co-free HEAs/MEAs strengthened by nanoprecipitates via composition optimizing.