Fatigue Properties and Microstructure of ZL114A Aluminum Alloy under Different Shot Peening Processes

The fatigue performance of ZL114A aluminum alloy after using S70 domestic pellet shot peening and SAE S70 imported pellet shot peening was studied.The microscopic mechanism of fatigue fracture of ZL114A aluminum alloy under the two processes was explored.The results show that there is no significant difference in the fatigue properties of the domestic shot peening process ZL114A aluminum alloy and the imported shot peening process ZL114A aluminum alloy.The area of the transient fracture area of the alloy test piece under the domestic shot peening process and the imported shot peening process both accounts for about 60%of the entire fracture.The dimples are densely arranged honeycombs, which indicate that the ductile fractures occur in the sample.The crack propagation path of the domestic shot peened ZL114A aluminum alloy and the imported shot peened ZL114A aluminum alloy sample is the same.The crack initiates on the surface of the sample, further expands through the strip area, and finally breaks in the ductile fracture.