Superior strength-ductility synergy of an oxide-dispersion strengthened CoCrNi-based multi-principal element alloy

被引：7

作者：

Zhang, Yiqing ^{[1
,2
]}

Lu, Kaiju ^{[2
]}

Jiang, Fengchun ^{[1
]}

Chen, Yongxiong ^{[2
]}

Liang, Xiubing ^{[2
]}

机构：

[1] Harbin Engn Univ, Yantai Res Inst, Yantai 264006, Shandong, Peoples R China

[2] Acad Mil Sci, Def Innovat Inst, Beijing 100071, Peoples R China

来源：

MATERIALS RESEARCH LETTERS | 2024年 / 12卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Multi-principal element alloy (MPEA); Oxide-dispersion strengthening (ODS); Transmission electron microscopy (TEM); Dislocation; Laser powder bed fusion (LPBF); ENTROPY; MICROSTRUCTURE; DEFORMATION; TEMPERATURE;

D O I：

10.1080/21663831.2024.2393166

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

CoCrNi-based multi-principal element alloys (MPEAs) often lack strength at elevated temperatures. Here, to overcome this deficiency, a novel oxide-dispersion strengthening (ODS) CoCrNi-based MPEA was designed by incorporating nano-scale yttria via LPBF. The ODS MPEA possesses superior strength-ductility synergy at both ambient and elevated temperatures to most reported CoCrNi-based MPEAs and state-of-the-art superalloys. TEM investigations revealed dislocation forest and slip traces in the interior of solidification dislocation cell structure, along with extended stacking faults and nano-twins. These features contributed to the excellent strength-ductility of the MPEA. Lastly, quantitative analyses uncovered the contributions of operating strengthening mechanisms to its high strength.

引用

页码：825 / 833

页数：9

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