Effects of Extrusion Processing and Heat Treatment on Mechanical Property and Heat Dissipation Performance of Mg-2.5Nd-1.0Zn-0.5Zr Alloy

Abstract

As heat dissipation material, magnesium alloys have smaller specific gravity and bigger specific heat capacity than copper alloys and aluminum alloys. The object of this study focused on the Mg-2.5Nd-1.0Zn-0.5Zr (wt.%) alloy. A research on Mg-xNd-yZn-0.4Zr (x=1.25–3.25,y=0–2.0,wt.%) alloys had been carried out systematically, but there was few reports about the research on heat dissipation performance of Mg-Nd based alloys. In this work, the effects of hot extrusion and heat treatment on mechanical properties and thermal performance of Mg-2.5Nd-1.0Zn-0.5Zr (wt.%) alloy were studied. The results show that the heat treatment and extrusion processing can improve the ultimate tensile strength (UTS) from 188.2Mpa to 231.2MPa. While the breaking elongation is also improved from 1.1% to 2.3%. Then, a patented way[1] to evaluate the dissipation performance is used in this work. And results reveal that with proper solution treatment, aging treatment and extrusion processing, the heat dissipation performance of this alloy can also be improved obviously.