A novel high-entropy alloy with a dendrite-composite microstructure and remarkable compression performance

SCRIPTA MATERIALIA

卷:159

Article

Fan, J. T.¹  Zhang, L. J.¹  Yu, P. F.¹  Zhang, M. D.¹  Li, G.^1,2  Liaw, P. K.²  Liu, R. P.¹ 

[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

[2] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

关键词: High-entropy alloy;    Dendrite-composite structure;    Compression behavior;    Multi-stage work-hardening;    Deformation twins;   

DOI  :  10.1016/j.scriptamat.2018.09.008

来源: Elsevier

【 摘 要 】

In the present study, a novel dendrite-composite high-entropy alloy consisting of nano-structured interdendritic regions and coarse dendrites was successfully designed and prepared by arc-melting. Interestingly, the as-cast Al18Fe33.3CO23Ni23C2.7 (at. %) alloy exhibited a great combination of high compressive strength and strain. More importantly, the new material exhibited pronounced three-stage work-hardening behavior. It was found that deformation twinning in the interdendritic region is the dominant mechanism responsible for the multi-stage work-hardening, thereby leading to good compression behavior of the new material. The synergistic effects between the dendrite and interdendritic regions are also effective for improving the mechanical property of the alloy. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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