Homogenization heat treatment for an additively manufactured precipitation-hardening high-entropy alloy
作者机构：Additive Manufacturing InstituteCollege of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China Sino-German College of Intelligent ManufacturingShenzhen Technology UniversityShenzhen518118China
出 版 物：《Rare Metals》 (稀有金属（英文版）)
年 卷 期：2022年第41卷第8期
页 面：2853-2863页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：financially supported by the National Natural Science Foundation of China (No.51971149) the Science and Technology Innovation Commission of Shenzhen (No.KQJSCX20180328095612712)
主 题：High-entropy alloy Selective laser melting Homogenization heat treatment Strengthening mechanism
摘 要：A precipitation-hardening high-entropy alloy(HEA),(FeCoNi)_(86)Al_(7) Ti_(7),was successfully fabricated using selective laser melting(SLM).Severe segregation of Ti occurred at the boundaries of dislocation cells.Therefore,homogenization heat treatment at 1150℃for 0.5 h was performed to alleviate the microsegregation.After homogenization,almost no dislocation cells were left in the grains,and recrystallization occurred as the average grain size increased from 37 to 54μm.Compared with the initial as-built HEA,the ductility of the HEA increases significantly from 29%to 40%,and the strength decreases slightly from 710 to 606 MPa.For further aging,pre-homogenization can decrease the precipitation of ordered L2_(1) phases.Because void has a high propensity to initiate from the matrix/L2_(1) incoherent interface,pre-homogenization reduced the number of weak points,thus considerably improving the plastic deformation ability of the aged HEA by 36%.In addition,the strengthening mechanism has also been analyzed for the aged HEA.It was revealed that the coherent L1_(2)precipitate contributed the most to the increased strength.
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