Abstract
High-pressure die-cast magnesium (Mg) alloys are required for components working at temperatures above 200 °C. These new alloys are necessary for high-volume applications such as critical parts used for internal combustion (IC) engines in power tools. Here we present new developments of a Mg–RE die-cast alloy that shows excellent ambient and high-temperature tensile strength, creep resistance, stiffness, and thermal conductivity, which are key advantages for alloys used at elevated temperatures. The excellent creep resistance of the die-cast Mg3.5RE (La, Ce, Nd)1.5GdMnAl alloy, in comparison with its counterpart alloy without the Al addition, shows a significant improvement of the steady-state creep rate (SCR) at 300 °C/50 MPa. The synergistic effect of Al, Gd, and Mn has been found to induce a novel and thermally stable AlMnGd ternary short-range order (SRO, 0–2 nm)/cluster (2–10 nm) in the Mg matrix, which is believed to be responsible for the improvement in creep performance.KeywordsMagnesium alloysMechanical propertiesCreep resistanceHigh pressure die castingStrengthening mechanism
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