Fracture behavior of high-entropy alloy coating by in-situ TEM tensile testing

摘要

AbstractThe fracture behavior of high-profile high-entropy alloy coating was characterized by in-situ TEM tensile testing. The samples for in-situ TEM tensile testing were obtained by FIB technology. The results show that irrelevant to phase constitution, the Young's module, fracture strength and ultimate elongation are measured as ?107?GPa, ?2.70?GPa and ?2.6%, respectively. Transcrystalline fracture and cleavage fracture with the cleavage plane of {112} are observed evidentially and the evolution of the dislocation motion in the material could be directly connected with the fracture behavior from the recorded movies obtained by a Gatan CCD camera. The engineering stress-strain curve is nearly linearity, however, a slight deviation away from linearity could be noted in the end of engineering stress-strain curve, which is attributed that the extra elastic deformation results in part of continued deformation.Highlights?Fracture behavior of HEA coating was characterized by in-situ TEM tensile testing.?By tensile movie, fracture process and dislocation motions were displayed clearly.?Cleavage fracture with the cleavage plane of {112} is observed.?Young's module, fracture strength and ultimate elongation are measured quantitatively.]]>