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

页码：605 / 610

页数：6

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