The microstructure evolution and plastic deformation mechanism of Mg-6.58Gd-5.7Y-0.55Zr alloy were investigated by uniaxial compression at temperatures ranging from 300 °C to 450 °C and with an initial strain rate of 0.1 s⁻¹, and characterized by optical microscope (OM), scanning electron microscope (SEM) and electron back-scattering diffraction (EBSD). The effect of temperature on twinning behavior was focused in detail. At relatively low temperature, such as 300 °C, multiple twin variant pairs can be activated in one grain, and the twining process was dominated by nucleation. However, at high temperature, most of the twins activated in one grain belong to the single twin variant pair with the highest Schmid Factor (SF), and twin growth seems to represent the twinning behavior at 450 °C. The twinning behavior of Mg-6.58Gd-5.7Y-0.55Zr alloy at temperatures ranging from 300 °C to 450 °C basically follows Schmid law, and can be well understood in terms of variation of stress state and activated deformation modes with compression temperature.

Mg-6.58Gd-5.7Y-0.55Zr合金的组织演变和塑性变形机理是通过在300°C至450°C的温度范围内以0.1 s ^-1的初始应变速率进行单轴压缩来研究的，并通过光学显微镜（OM），扫描电子显微镜（SEM）和电子背散射衍射（EBSD）进行表征。详细研究了温度对孪生行为的影响。在相对较低的温度下（例如300°C），可以在一个晶粒中激活多个孪生变体对，并且成核过程主导着孪生过程。但是，在高温下，在一个颗粒中活化的大多数孪晶属于具有最高Schmid因子（SF）的单对孪生变体对，并且孪生生长似乎代表了在450°C时的孪生行为。Mg-6.58Gd-5.7Y-0.55Zr合金在300°C至450°C范围内的孪生行为基本上遵循Schmid律，并且可以根据应力状态的变化和压缩温度下的活化变形模式进行很好的理解。