Achieving high strain rate superplasticity in Mg-Y-Nd-Zr alloy processed by homogenization treatment and equal channel angular pressing

作者：Kang, Zhixin^*; Zhou, Lianli; Zhang, Junyi

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2015, 633: 59-62.

DOI：10.1016/j.msea.2015.03.011

• Magnesium alloys
• Superplasticity
• Equal channel angular pressing
• Microstructure

Homogenization treatment and equal channel angular pressing was applied to Mg-Y-Nd-Zr alloy cast ingot. Uniform grains with a grain size of similar to 1.5 mu m and spherical secondary-phase preferentially located at the grain boundaries were obtained. Excellent high-strain rate superplasticity of 860% and 960% was achieved at 500 degrees C, 1 x 10(-1) s(-1) and 475 degrees C, 2 x 10(-2) s(-1), respectively, for the first time such a highstrain rate superplasticity was achieved in magnesium alloys processed by ECAP. The maximum elongation of 1120% was achieved at 475 degrees C, 3 x 10(-3) s(-1). They were attributed to the thermal stability of uniform fine-grain microstructure and the coordination function of secondary-phase.

• 出版日期2015-5-1
• 单位华南理工大学