Effect of Sm on twinning behavior of Mg-Gd-Y-Zr alloy at room temperature compression
Wanwan Mei, Hao Pang, Quanan Li, Xiaoya Chen
Abstract
Twining plays an important role in adjusting the mechanical properties and microstructure in magnesium alloys at room temperature deformation. In this work, the Mg-6Gd-3Y(-3Sm)-0.5Zr alloy was compressed at room temperature to study the effect of the Sm element on the twinning behavior. The results showed that twin of Mg-6Gd-3Y(-3Sm)-0.5Zr alloy after compressive deformation was {10-12} twin. In Mg-6Gd-3Y-0.5Zr alloy, there was coarse parallel twin, while in the Mg-6Gd-3Y-3Sm-0.5Zr alloy, there was a lot of fine cross twin. The variation of activated twin in Mg-6Gd-3Y-3Sm-0.5Zr alloy does not obey Schmid law. The activated cross twin variation in Mg-Gd-Y-Sm-Zr alloy can be divided into single-variant cross twin and multi-variant cross twin, both of which lead to changes in orientation differences. The large number of fine cross twin lead to matrix divided. This strengthened fine grains and the Mg-Gd-Y-Sm-Zr alloy showed high deformation stresses.