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摘要
The local deformation layer structure was prepared on the surface of AZ31 magnesium alloy by surface mechanical attrition treatment(SMAT), and the change law of performance with the structure was tested. The results show that SMAT can prepare the gradient structure of base material-twin crystal-nanocrystalline. With the same attrition time, the nano-layer of the sample with large grains is thicker than that of the sample with small grains, and the nano-layer thickness of the sample with large grains tends to be stable after 2 h attrition. During the SMAT process, the basal texture strength decreases significantly first and then increases gradually with the increase of attrition time. The microhardness decreases first and then increases along the thickness direction of plate. The fracture morphology analysis show that the fracture mode at the fracture edge is ductile and brittle mixed fracture, the fracture of core is plastic fracture, and the fracture of sample is the result of crack spreading from surface to core. The mechanism of SMAT nanocrystalline preparation is that the dislocation gathers at the twin crystal boundary to form fine high-energy subgrains, and high-energy subgrains undergo dynamic recrystallization to obtain nanocrystalline. ? 2022, Editorial Board of Journal of Plasticity Engineering. All right reserved.
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