Abstract
In this study, Mg-10mass%Gd or Dy-2 or 3mass%Nd alloys containing zirconium as a grain refinement agent were melted for the purpose of further improvements of various properties. Aging characteristics and tensile properties up to 350°C of these alloys were investigated. Hardness at peak-aging becomes higher by the additions of 2 or 3mass%Nd and Zr, and pronounced age hardening is shown up to 275°C in Mg-Gd alloys and up to 250°C in Mg-Dy alloys. The remarkable age hardening is found to be caused by the precipitation of the metastable β"-phase with a D019 Crystal structure based on the results obtained by a transmission electron microscope. The Mg-10mass%Gd-3mass%Nd-Zr alloy has the highest strength in all examined alloys, and its ultimate tensile strength at 200 and 250°C are 310MPa and 300MPa respectively. Furthermore, specific strength of the Mg-10mass%Gd-3mass%Nd-Zr alloy at 250°C is 155MPa/(Mg/m3) and is higher by 30MPa/(Mg/m3) than that of the WE54A alloy. The Mg-Dy alloys are inferior to the Gd-bearing alloys in strength, but exhibit more ductility.
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