TY - JOUR
T1 - Optimizing precipitation hardening in a L12-strengthened medium-entropy alloy via tuning the anti-phase boundary energy
AU - Lu, Wenjie
AU - Gong, Junjie
AU - Huang, Bin
AU - Wang, Yafeng
AU - Yang, Xu Sheng
AU - Luo, Xian
AU - Hu, Rui
AU - Yang, Yanqing
N1 - Funding Information:
The authors would like to acknowledge the financial supports of the China Postdoctoral Science Foundation (No. 2023M732850 ), the National Natural Science Foundation of China (No. 52303391 and 51971176 ), the Natural Science Foundation of Shaanxi Province (No. 2021JM-061 ), Guangdong Basic and Applied Basic Research Foundation (No. 2022A1515011322 ) and PolyU Grant (1-YWBC).
Publisher Copyright:
© 2024
PY - 2024/5/1
Y1 - 2024/5/1
N2 - In present work, we investigate the elemental partition behaviors in L12 ordered intermetallics and its influence on mechanical properties in a Ni-Co-Cr-Al-Ta medium-entropy alloy (MEA) system through a combination of density functional theory (DFT) calculations and experimental investigation. Our finding reveal that Ta has a strong tendency to occupy Al sublattice, while Co prefers Ni sublattice, Cr, on the other hand, randomly occupy Al and Ni sublattices, resulting in the formation of the multicomponent (Ni, Co, Cr)3(Al, Ta, Cr) L12 intermetallics. Among the constituent elements, Ta is identified as an efficient element for enhancing hardening of the alloy. Furthermore, we demonstrate that improving Ta/Al ratio leads to a significant increase in anti-phase boundary (APB) energy, resulting in superior precipitation hardening effects and excellent mechanical properties. Our founding provide valuable insights for further the rationally design and rapid development of high performance L12-strengthened alloys.
AB - In present work, we investigate the elemental partition behaviors in L12 ordered intermetallics and its influence on mechanical properties in a Ni-Co-Cr-Al-Ta medium-entropy alloy (MEA) system through a combination of density functional theory (DFT) calculations and experimental investigation. Our finding reveal that Ta has a strong tendency to occupy Al sublattice, while Co prefers Ni sublattice, Cr, on the other hand, randomly occupy Al and Ni sublattices, resulting in the formation of the multicomponent (Ni, Co, Cr)3(Al, Ta, Cr) L12 intermetallics. Among the constituent elements, Ta is identified as an efficient element for enhancing hardening of the alloy. Furthermore, we demonstrate that improving Ta/Al ratio leads to a significant increase in anti-phase boundary (APB) energy, resulting in superior precipitation hardening effects and excellent mechanical properties. Our founding provide valuable insights for further the rationally design and rapid development of high performance L12-strengthened alloys.
KW - Elemental partition behavior
KW - L1 intermetallics
KW - Medium-entropy alloy
KW - Precipitation hardening
UR - http://www.scopus.com/inward/record.url?scp=85185391149&partnerID=8YFLogxK
U2 - 10.1016/j.scriptamat.2024.116045
DO - 10.1016/j.scriptamat.2024.116045
M3 - Journal article
AN - SCOPUS:85185391149
SN - 1359-6462
VL - 245
JO - Scripta Materialia
JF - Scripta Materialia
M1 - 116045
ER -