Abstract
Recently, new magnesium alloys with high mechanical strength and heat-resistance have been developed in Mg-RE-Zn (RE: Y, Dy, Ho, Er, Gd, Tb, Tm) system, and are widely noticed in industrial circles. These Mg-RE-Zn alloys are characterized by a long period ordered (LPO) structure. The mechanical properties of these LPO Mg-RE-Zn alloys are drastically improved by plastic deformation. Extruded LPO Mg-RE-Zn alloys exhibit high yield strengths greater than 350MPa and elongations of 4% or higher at ambient temperature, and high elevated-temperature yield strength greater than 300MPa at 473K. The LPO Mg-RE-Zn alloys are promising candidates for lightweight structural materials.
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