Using multiple FSP passes to cure onion splitting of Mg alloys deformed at elevated temperatures

Abstract

The investigation of high temperature mechanical properties of the friction stir processed AZ61 alloy with different passes shows that the one-pass processed AZ61 Mg alloy exhibits inferior superplastic deformation ability along the FSP forward traveling direction due to the onionring pre-mature splitting. The homogenous microstructure in the multi-oass friction stir orocessed Mg alloy can avoid the onion-ring splitting and eliminate the anisotropy behavior of high temperature mechanical properties. © 2007 The Japan Institute of Metals.