TY - JOUR
T1 - A comparative study on microstructure, nanomechanical and corrosion behaviors of AlCoCuFeNi high entropy alloys fabricated by selective laser melting and laser metal deposition
AU - Ren, Yaojia
AU - Wu, Hong
AU - Liu, Bin
AU - Liu, Yong
AU - Guo, Sheng
AU - Jiao, Z. B.
AU - Baker, Ian
N1 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China (Nos. 52111530193 and 52020105013 ), the Key Research and Development Program of Hunan Province (No. 2022SK2006), the Fundamental Research Funds for the Central University of Central South University (No. 2021ZZTS0098 ), and the HK Research Grants Council (ECS 25202719 and GRF 15227121 ). The authors would also thank Sinoma Institute of Materials Research (Guang Zhou) Co., Ltd. for the assistance with the TEM characterization.
Funding Information:
This work was financially supported by the National Natural Science Foundation of China (Nos. 52111530193 and 52020105013), the Key Research and Development Program of Hunan Province (No. 2022SK2006), the Fundamental Research Funds for the Central University of Central South University (No. 2021ZZTS0098), and the HK Research Grants Council (ECS 25202719 and GRF 15227121). The authors would also thank Sinoma Institute of Materials Research (Guang Zhou) Co. Ltd. for the assistance with the TEM characterization.
Publisher Copyright:
© 2022
PY - 2022/12/20
Y1 - 2022/12/20
N2 - 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 (∼90 µm 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 (∼150 µm 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.
AB - 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 (∼90 µm 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 (∼150 µm 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.
KW - Corrosion
KW - High entropy alloys
KW - Laser metal deposition
KW - Nanomechanics
KW - Selective laser melting
UR - https://www.scopus.com/pages/publications/85132899510
U2 - 10.1016/j.jmst.2022.05.035
DO - 10.1016/j.jmst.2022.05.035
M3 - Journal article
AN - SCOPUS:85132899510
SN - 1005-0302
VL - 131
SP - 221
EP - 230
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -