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High Strength-Thermal Conductivity Mg–Ga–Ca–Ce Sheet by Hot-Extrusion and Rolling
Mouxin Wu,Xueqi Jiang,Jihua Chen,Hongge Yan,Weijun Xia,Bin Su,Yifu Deng 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1
The thermal conductivity of magnesium alloys is increasingly required for fast heat dissipation in the automotive and electronicfields. However, the methods for mechanical property improvement such as grain refinement and alloying tend to deterioratetheir thermal conductivity. In this work, a novel low-alloy Mg–2Ga–0.6Ca–0.6Ce alloy exhibits a surprisingly goodcombination of high strength and high thermal conductivity compared with the other samples. The wrought alloys are of smallgrain sizes (< 2 μm), have high yield strength (> 272 MPa) and exhibit excellent thermal conductivity (> 143 W·m−1·K−1). The as-extruded alloy exhibits excellent yield strength (272 MPa) and high thermal conductivity (144.6 W·m−1·K−1) atroom temperature. After 30% rolling, the yield strength is further increased to 283 MPa, and the thermal conductivity isslightly reduced to 143.2 W·m−1·K−1. The effects of Ca and Ce addition on mechanical properties and thermal conductivityare analyzed from dislocation density, dynamic recrystallization fraction (fDRX), average grain size (dDRX) and texturecharacteristics. The higher yield strength can be attributed to the combination of grain boundary strengthening, dislocationstrengthening and second phase strengthening. Moreover, the addition of Ca and Ce can obviously reduce solute Ga atomsin α-Mg, which is the key to high thermal conductivity. Therefore, adding two alloying elements, Ca and Ce, significantlyimproves both tensile properties and thermal conductivity.
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