Microstructure and mechanical properties of twinned Al0.5CrFeNiCo0.3C0.2 high entropy alloy processed by mechanical alloying and spark plasma sintering
Microstructure and mechanical properties of twinned Al0.5CrFeNiCo0.3C0.2 high entropy alloy processed by mechanical alloying and spark plasma sintering
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DOI：
10.1016/j.matdes.2013.08.099
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发表时间：
2014-02-01
影响因子：
8.4
通讯作者：
Fu, Zhiqiang
中科院分区：
文献类型：
--
作者：
Fang, Sicong;Chen, Weiping;Fu, Zhiqiang
大多数多元高熵合金(HEA)只由金属元素组成。本文通过引入非金属碳元素，采用机械合金化(MA)和放电等离子烧结(SPS)工艺成功地制备了非等原子Al0.5CrNiCo0.3C0.2HEA。系统地研究了该合金的合金化行为、显微组织、相演变和力学性能。在MA过程中，球磨38h内形成了面心立方(FCC)和体心立方(BCC)结构的过饱和固溶体。然而，SPS后观察到主要的面心立方相、体心立方相、Cr23C6碳化物和有序的体心立方相。面心立方相富Fe-Ni，体心立方相富Ni-Al，有序体心立方相尤其富Al。此外，SPS后，仅在部分面心立方相中出现了明显的纳米形变孪晶。Al0.5CrFeNiCo0.3C0.2高熵合金的抗压强度为2131 MPa，维氏硬度为617+/-25HV。(C)2013爱思唯尔有限公司。保留所有权利。
Most of multi-component high entropy alloys (HEAs) only consist of metallic elements. In the present paper, by introducing nonmetallic carbon element, non-equiatomic Al0.5CrFeNiCo0.3C0.2 HEA has been successfully prepared by mechanical alloying (MA) and spark plasma sintering (SPS) process. Alloying behavior, microstructure, phase evolution and mechanical properties of the alloy were investigated systematically. During the MA process, a supersaturated solid solution with both face-center cubic (FCC) and body-center cubic (BCC) structures was formed within 38 h of milling. However, a major FCC phase, a BCC phase, Cr23C6 carbide and an ordered BCC phase were observed after SPS. The FCC phase is enriched in Fe-Ni, the BCC phase is enriched in Ni-Al and the ordered BCC phase is especially enriched in Al, respectively. In addition, nanoscale deformation twins obviously presented only in partial FCC phase after SPS. The compressive strength and Vickers hardness of Al0.5CrFeNiCo0.3C0.2 high entropy alloy are 2131 MPa and 617 +/- 25 HV, respectively. (C) 2013 Elsevier Ltd. All rights reserved.