Effects of temperature and strain rate on crack propagation in NiCoCr multi-principal element alloys: A molecular dynamics simulation

XR Zhao and SL Liu and Z Xie and Z Liu and DW Wang and LG Luo, MATERIALS TODAY COMMUNICATIONS, 43, 111667 (2025).

DOI: 10.1016/j.mtcomm.2025.111667

In this paper, the tensile deformation behaviour of NiCoCr multi- principal element alloys under a cracked system at four different temperatures (77 K, 300 K, 800 K and 1100 K) and four different strain rates (5 x 108s_ 1, 2 x 108s_ 1, 5 x 107s_ 1 and 2 x 107s_ 1) was investigated by using molecular dynamics simulation. It is shown that the mechanical properties of these alloys are significantly influenced by both temperature and strain rate. Specifically, the alloys exhibit greater strength at lower temperatures and higher strain rates, which is mainly due to the differences in the deformation mechanisms of the alloys at different temperatures and strain rates. This study provides a reference for developing dynamic damage evolution models for metallic materials under high temperatures and high strain rates. It holds important implications for advancing research into the mechanical properties of multi-principal element alloys, their potential engineering applications, and the understanding of their microstructural characteristics.

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