Open AccessEffect of twin boundary on mechanical behavior of Cr<sub>26</sub>Mn<sub>20</sub>Fe<sub>20</sub>Co<sub>20</sub>Ni<sub>14</sub> high-entropy alloy by molecular dynamics simulation
Author(s) -
Shen Tian-Zhan,
Haiyang Song,
An Min-Rong
Publication year - 2021
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.70.20210324
Subject(s) - alloy , materials science , crystallography , metallurgy , chemistry
The high-entropy alloys break through the traditional alloy structure and present unique and superior mechanical properties. However, the potential deformation mechanism of high-entropy alloy, which is regarded as a new member of alloy families in recent years, needs to be further investigated. In this paper, the mechanical properties of the nano-twin Cr 26 Mn 20 Fe 20 Co 20 Ni 14 high-entropy alloy under tensile loading are studied by molecular dynamics simulation, and the effect of twin boundary on the deformation behavior of nano-twin Cr 26 Mn 20 Fe 20 Co 20 Ni 14 high-entropy alloy is studied on an atomic level. The results show that the yield strength of the nano-twin Cr 26 Mn 20 Fe 20 Co 20 Ni 14 high-entropy alloy increases with twin boundary spacing decreasing, presenting a Hell-Petch relationship. However, there is a critical value of the twin boundary spacing, which makes the sensitivity of the yield strength of the high-entropy alloy to the twin boundary spacing change significantly before and after this value. The results also indicate that the deformation mechanism of nano-twin Cr 26 Mn 20 Fe 20 Co 20 Ni 14 high-entropy alloy changes from dislocation slip to amorphous phase transition with the decrease of twin boundary spacing. The research results of this paper have a certain reference value and guidance significance for designing and preparing high-performance high-entropy alloys.