Superplasticity of a fine-grained Mg–9Gd–4Y–0.4Zr alloy evaluated using shear punch testing

Journal of Materials Research and Technology

Terence G. Langdon¹  Reza Alizadeh²  Reza Mahmudi² 

[1] Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, United Kingdom;School of Metallurgical and Materials Engineering, University of Tehran, Tehran, Iran;

关键词: Mg–Gd–Y–Zr alloy;    Superplasticity;    Strain rate sensitivity;    Shear punch;   

DOI  :  10.1016/j.jmrt.2014.04.004

来源: DOAJ

【 摘 要 】

The superplasticity of an extruded fine-grained Mg–9Gd–4Y–0.4Zr alloy was investigated by measuring the strain rate sensitivity using shear punch testing (SPT). Shear punch tests were conducted at shear strain rates in the range of 3 × 10−3–2 × 10−1 s−1 and at temperatures in the range of 573–773 K. The results indicate the strain rate sensitivity, m, increases from about 0.11 at 573 K to about 0.40 at 723 K and then decreases to 0.32 with a further increase in test temperature. A strain rate sensitivity of 0.40 and an activation energy of 140 kJ/mol are indicative of a superplastic deformation behavior dominated by grain boundary sliding accommodated by lattice diffusion at temperatures above 673 K.

【 授权许可】

Unknown