Abstract
A tensile test of a magnesium alloy (AZ31B) was performed in various temperature environments, and the change of the mechanical characteristics of the magnesium alloy with temperature was examined. A creep test of the magnesium alloy was performed, and the relation between creep damage and the acoustic emission (AE) occurrence behavior under high temperature conditions was investigated. In the tensile test, when temperature rise in more than 150℃, the 0.2% proof stress and tensile strength of the magnesium alloy (AZ31B) became small, and the elongation of it increased. In the creep test, although AE event count increased in the transient creep stage just after loading, it decreased in the stationary creep stage and increased again in the accelerating creep stage. Since the relation between AE occurrence and each stage of the creep deformation was observed clearly, it was confirmed that the acoustic emission method was available in creep damage evaluation of the magnesium alloy.
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