Study of Crack-Propagation Mechanism of Al0.1CoCrFeNi High-Entropy Alloy by Molecular Dynamics Method

The crack propagation mechanism of Al0.1CoCrFeNi high-entropy alloy (HEA) was investigated with the molecular dynamics method. pre-crack and stretching processes single-crystal HEA grain boundaries were simulated. effects strain rates different crystal structures on therein at room temperature studied. They both exhibited plastic deformation ductile fracturing, tip involved dislocations 45° 135° under tensile stress. formed in intrinsic-stacking fault stacking based hexagonal closely packed spread then accumulated near boundary. At position where accumulated, dent obviously serious 1/3 fracturing finally occurred. yield strength for lower than that HEA. However, Young’s moduli higher those can be used as emission source dislocations, it is easier to form the-single HEA, but existence hinders slippage dislocations.