Microstructure and Mechanical Properties of Mg_96Y_3Zn_1Alloy Processed by Equal Channel Angular Pressing

摘要

The Mg_96Y_3Zn_1 alloy processed by equal channel angular pressing has been investigated. It was found that the Mg_96 YsZn_1 alloy processed by ECAP obtained ultrafine grains and exhibits excellent mechanical properties. After ECAP, the average grain size of Mg_96Y_3Zni alloy refined to about 400 nm. The highest strengths with yield strength of 381.45MPa and ultimate tensile strength of 438.33MPa were obtained after 2 passes at 623K. It was found that cracks were preferentially initiated and propagated in the interior of X-phase during the tensile test. As a result, the elongation of alloy is decreased with pass number increasing.