Effect of Artificial Aging on Microstructures and Mechanical Properties of Extruded Mg Alloy ZK60

De Liang Yin; Jian Qiao; Hong Liang Cui

doi:10.4028/www.scientific.net/AMM.697.72

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 697Effect of Artificial Aging on Microstructures and...

Effect of Artificial Aging on Microstructures and Mechanical Properties of Extruded Mg Alloy ZK60

Abstract:

An extruded ZK60 magnesium alloy was subjected to artificial aging at 180 oC for an investigation of the effect of aging time on its precipitation behavior and mechanical properties. Uniaxial tensile tests were conducted to obtain the mechanical properties. Optical microscopy and transmission electron microscopy (TEM) were employed to observe microstructure change before and after aging treatment. It is shown that, both tensile yield strength and ultimate tensile strength increases with aging time. The fracture elongation after aging for 20 h reaches up to 21.0%, and the yield strength increases to 269.5 MPa, 19.4% higher than that of extruded specimens (un-aged), showing a good match of strength and ductility. Three newly-formed precipitates were observed after aging for over 20 h, among which particulate and dispersive precipitates should be responsible for the good combination of strength and ductility.