MECHANICAL PROPERTIES AND HIGH-TEMPERATURE OXIDATION BEHAVIOR OF Mg-Al-Zn-Ca-Y MAGNESIUM ALLOYS

摘要

Ignition resistance and tensile properties of Mg-3Al-1Zn and Mg-6Al-1Zn (wt.%) alloys with combined addition of calcium andyttrium were investigated in the present study. The results of thisstudy clearly show that the combined addition of calcium andyttrium can lead to significant increase in both ignitiontemperature and tensile properties, comparing to 2 wt.% Ca-addedmagnesium alloys with lamella-shaped eutectic phases. This isbecause the reduction of calcium content and the addition of asmall amount of yttrium bring about a reduced amount of coarseCa-containing phases and the formation of duplex protectiveoxide layers that effectively prevent oxygen penetration into themelt.