Abstract
The Mg 96Y 3Zn 1 alloy processed by extrusion and equal channel angular pressing (ECAP) was investigated. It was found that the Mg 96Y 3Zn 1 alloy processed by extrusion and ECAP obtained ultrafine grains and exhibited excellent mechanical properties. After ECAP, the average grain size of Mg 96Y 3Zn 1 alloy was refined to about 400 nm. The highest strengths with yield strength of 381.45 MPa and ultimate tensile strength of 438.33 MPa were obtained after 2 passes at 623 K. The high strength of Mg 96Y 3Zn 1 alloy was due to the strengthening by the grain refinement, the long period stacking (LPS) structure, solid solution, fine Mg 24Y 5 particles, and nano-scale precipitates. It was found that the elongation was decreased with pass number increasing. It was because that the cracks were preferentially initiated and propagated in the interior of X-phase during the tensile test.
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