Advanced Mg–Al–Ca Alloys with Combined Properties of High Thermal Conductivity, High Mechanical Strength and Non-Flammability

Abstract

High thermal conductivity, high strength and non-flammability have successfully been achieved concurrently for the first time in Mg–4.5Al–2.5Ca, Mg–5Al–3Ca, Mg–6Al–4Ca, and Mg–4Al–2Ca–0.03Be (at%) alloys, which are produced by hot extrusion of the heat-treated cast alloys. These alloys consist of α-Mg, and C36, C14 and C15 compounds, and exhibit a high thermal conductivity of 111–119 Wm⁻¹K⁻¹, a high ignition temperature of 1343–1408 K and a high tensile yield strength of 318–363 MPa.

Comparison of the thermal conductivity and tensile yield strength of the extruded Mg–Al–Ca alloys developed in this study, with various wrought Mg alloys having high thermal conductivity. Only the developed alloys had non-flammability. High thermal conductivity, high strength and non-flammability have successfully been achieved concurrently for the first time in the developed alloys.