Abstract
Isothermal fatigue tests were carred out on Mg-12Gd-3Y-0.5Zr magnesium alloy and its heat-treated counterpart at different temperatures. The exprimental results shows that isothermal fatigue strength of two alloys decrease very slowly with increasing temperature up to 200°C. The ultimate tensile strength of heattreated Mg-12Gd-3Y-0.5Zr is slight lower than that of as-rolled counterpart, however, the fatigue strength of heat-treated alloy is higher.
Highlights
Magnesium alloys are called green-engineering materials with great development potential because of their many outstanding advantages, such as low density, high specific strength and specific stiffness, good machinability and castability, etc.[1]
There are some serious shortcomings, one of which is poor mechanical property at high temperature that limits the applications of magnesium alloys in the corresponding conditions
Many attempts have been made to improve the mechanical properties of magnesium alloys
Summary
Magnesium alloys are called green-engineering materials with great development potential because of their many outstanding advantages, such as low density, high specific strength and specific stiffness, good machinability and castability, etc.[1]. From Figs. and 3, we can see that the heattreated Mg-12Gd-3Y-0.5Zr has slight lower ultimate tensile strength than that of as-rolled counterpart, it has higher fatigue strength It means that in the cyclic loading condition, the heat-treated alloy would be preferential to be used at the temperatures ranged from ambient up to 200 oC. Higher elongation-to-failure of heat-treated Mg-12Gd-3Y-0.5Zr offsets the negative effect of its lower ultimate tensile strength and the higher fatigue strength can be achieved at different temperatures except 235 oC
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