Effect of Low Temperature and Low Speed Differential Temperature Extrusion on the Performance of MG-6AL-1ZN-0.15MN Alloy

Abstract

Magnesium alloys with the hexagonal close-packed crystal structure have the low formability and weaker mechanical properties, contracted with Ti and Al alloys, which also limits the application in aerospace, aviation and automobile fields. Therefore, it is a big deal to invest the effect of low temperature and low speed differential temperature extrusion (DTE) on the microstructure and mechanical properties of mg-6al-1zn-0.15 MN (AZ61) alloy. In this work ,The AZ61 alloy was prepared by differential temperature extrusion （the ingoting temperature is 450 °C, the mould temperature is 90 °C, the extrusion ratio is 7:1）with finer recrystallized grains (DRX) ,obvious < 01-10 > texture, non-recrystallized grains with high density of dislocations. At last, this work indicates that AZ61 alloy used DTE technology to equip with bimodal grain structure, the grains in the non-recrystallization region provide high-density dislocations, and the grains in the recrystallization region provide grain boundary strengthening. Which is the origin of the mechanical properties improved greatly.