A comparative study on microstructure, nanomechanical and corrosion behaviors of AlCoCuFeNi high entropy alloys fabricated by selective laser melting and laser metal deposition

被引：32

作者：

Ren, Yaojia ^{[1
]}

Wu, Hong ^{[1
]}

Liu, Bin ^{[1
]}

Liu, Yong ^{[1
]}

Guo, Sheng ^{[2
]}

Jiao, Z. B. ^{[3
]}

Baker, Ian ^{[4
]}

机构：

[1] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

[2] Chalmers Univ Technol, Dept Ind & Mat Sci, SE-41296 Gothenburg, Sweden

[3] Hong Kong Polytech Univ, Dept Mech Engn, Hong Kong 999077, Peoples R China

[4] Dartmouth Coll, Thayer Sch Engn, Hanover, NH 03755 USA

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2022年 / 131卷

基金：

中国国家自然科学基金;

关键词：

Selective laser melting; Laser metal deposition; High entropy alloys; Nanomechanics; Corrosion; PHASE; PRECIPITATION; DEFORMATION; ANISOTROPY; STRENGTH; TITANIUM; TEXTURE;

D O I：

10.1016/j.jmst.2022.05.035

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present study investigated the microstructure, nanomechanics, and corrosion behavior of AlCoCuFeNi high entropy alloys fabricated by selective laser melting (SLM) and laser metal deposition (LMD). The microstructure of SLM-processed specimens was mainly composed of columnar-grained BCC matrix (similar to 90 mu m in width) and Cu-rich twinned FCC phase. The columnar grains grew epitaxially along the building direction and exhibited a strong {001} texture. In comparison, a coarse columnar-grained BCC matrix (similar to 150 mu m in width) with a stronger < 001 > texture, rod-like B2 precipitates, and large core-shell structured FCC phases were formed in the LMD-processed specimens due to the higher heat accumulation effect. Consequently, the LMD-processed specimens showed a lower hardness, wear resistance, and corrosion resistance, but higher creep resistance and reduced Young's modulus than the SLM-processed specimens. Hot cracks occurred in both types of specimens, which could not be completely suppressed due to Cu segregation. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：221 / 230

页数：10

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