Nanosized precipitates and dislocation networks reinforced C-containing CoCrFeNi high-entropy alloy fabricated by selective laser melting

被引：143
作者：
Wu, Wenqian [1 ]
Zhou, Rui [1 ]
Wei, Bingqiang [1 ]
Ni, Song [1 ]
Liu, Yong [1 ]
Song, Min [1 ]
机构：
[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2018年 / 144卷
基金：
中国国家自然科学基金;
关键词：
High-entropy alloy; Selective laser melting; Microstructure; Precipitation; Dislocation; INDUCED PLASTICITY STEELS; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; TRADE-OFF; MICROSTRUCTURE; STRENGTH; EVOLUTION; CARBON; GRAIN; DEFORMATION;
D O I：
10.1016/j.matchar.2018.08.019
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, we report a selective laser melted C-containing CoCrFeNi high-entropy alloy (HEA) with unique cellular and columnar subgrain structures. The subgrain boundaries are made of dislocation networks decorated by the segregation of Cr element and nanosized M23C6-type carbides. Structural characterization of dislocations and dislocation reactions in dislocation networks was conducted using high-resolution transmission electron microscopy. The high strength of the C-containing HEA is attributed to dislocation networks strengthening and nanosized carbides strengthening. These findings can provide a guidance for developing HEAs with superior mechanical properties, particularly high strength.
引用
收藏
页码：605 / 610
页数：6
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