Thermal Conductivity of Magnesium Alloys in the Temperature Range from −125 °C to 400 °C

Author： Lee Sanghyun Ham Hye Kwon Su Kim Sok Suh Chang

ISSN： 0195-928X

Source： International Journal of Thermophysics, Vol.34, Iss.12, 2013-12, pp. : 2343-2350

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Abstract

Magnesium alloys have been widely used in recent years as lightweight structural materials in the manufacturing of automobiles, airplanes, and portable computers. Magnesium alloys have extremely low density (as low as 1738 kg · m⁻³) and high rigidity, which makes them suitable for such applications. In this study, the thermal conductivity of two different magnesium alloys made by twin-roll casting was investigated using the laser-flash technique and differential scanning calorimetry for thermal diffusivity and specific heat capacity measurements, respectively. The thermal diffusivity of the magnesium alloys, AZ31 and AZ61, was measured over the temperature range from −125 °C to 400 °C. The alloys AZ31 and AZ61 are composed of magnesium, aluminum, and zinc. The thermal conductivity gradually increased with temperature. The densities of AZ31 and AZ61 were 1754 kg · m⁻³ and 1777 kg · m⁻³, respectively. The thermal conductivity of AZ31 was about 25 % higher than that of AZ61, and this is attributed to the amount of precipitation.