Improving the high-temperature mechanical properties of a magnesium alloy by equal-channel angular pressing

Han, Bing Q. and Langdon, Terence G. (2005) Improving the high-temperature mechanical properties of a magnesium alloy by equal-channel angular pressing. Materials Science and Engineering: A, 410-411, 435-438. (doi:10.1016/j.msea.2005.08.084).

Record type: Article

Abstract

Equal-channel angular pressing (ECAP) was conducted on a Mg–0.55% Zr alloy at a temperature of 513 K. It is shown that processing by ECAP refines the grain size from ~75 to ~8.6 ?m. Tensile testing was performed at temperatures from 473 to 773 K and at initial strain rates from 10?5 to 10?2 s?1 using specimens in the as-received condition and after processing by ECAP through six passes. There is a higher strength in the as-received Mg–Zr alloy than in the Mg–Zr alloy after ECAP for six passes at a temperature of 513 K. The results show the tensile elongations are higher after ECAP and a maximum elongation of ~380% was achieved in the as-pressed material at 773 K using an initial strain rate of 4.2 × 10?5 s?1. The strain rate sensitivity for the as-pressed alloy was estimated as ~0.17 and the activation energy were intermediate between the values for grain boundary and lattice diffusion in magnesium.

This record has no associated files available for download.