Superplastic Deformation Processes of the Mg Alloys: A Detailed Review

Abstract

The superplasticity of magnesium alloys (Mg) exhibits excellent behavior at high elongations while maintaining mechanical properties and a deformation mechanism that depends on intergranular sliding. These alloys can be achieved at lower stress levels with relatively high temperatures. Furthermore, the microstructure is fine-grained and homogeneous, which gives the alloy a very high potential for forming then, obtaining complex components of various weights. The microstructure and mechanical properties make magnesium alloys a successful choice for many industrial applications, including the automotive, aviation, and medical device industries, which require lightweight materials with high strength. The superplastic behavior of magnesium alloys treated by various manufacturing operations, such as differential speed rolling (DSR), equal channel angular pressing (ECAP), and friction stir processing (FSP) was studied. These operations contribute to reducing grain size and enhancing intergranular sliding, which is the basic mechanism responsible for superplasticity.