Low-temperature electrical resistivity and thermal conductivity of binary magnesium alloys

Abstract

The electrical resistivity and thermal conductivity of some Mg-Al, Mg-Zn and Mg-Mn binary magnesium alloys were measured in the temperature range of 2-300 K. The electrical resistivity increased with the increasing alloying content in each binary alloy system, while the thermal conductivity exhibited an opposite trend. The low-temperature thermal conductivity was understood using j = (A/ T + BT 2 ) À1 + CT 2 , which is found to be applicable in various binary and/or multi-component alloy systems. The parameters A, B and C were determined through numerical fitting of the experimental data. Significant differences were found in the effect of three solute atoms on the thermal conductivity of Mg. The reasons for large differences in the thermal conductivity of the three binary magnesium alloy systems are discussed. Variations in the atomic volume and the valence are believed to play an important role on the thermal conductivity of magnesium alloys.

Microstructure and tensile properties of SiC nanoparticles reinforced magnesium matrix composite prepared by multidirectional forging under decreasing temperature conditions

“…7. According to the classic Hall-Petch equation [31], YS of a given alloy is proportional to d À 1/2 , where d is the mean grain size and YS would increases when d decreases. Therefore, the average grain size of the nanocomposite is decreased with increasing the MDF passes and decreasing the MDF temperature (Fig.…”

Annealing strengthening of pre-deformed Mg–10Gd–3Y–0.3Zr alloy

“…Twin nucleation is usually associated with surfaces or defects that provide a local stress concentration to promote the nucleation process. Generally, twin nucleation includes homogeneous nucleation from a free surface [7], dislocation-twin interactions [1,8,9], twin-twin interactions [10] and precipitation/ void-induced nucleation [11]. Recently, a new model is proposed for thermally activated, stress-driven growth of twin boundaries [12].…”

“…Magnesium alloys, owing to their low density, good recycling potential and abundant resources, have been attracting attention in automobile, railway, aerospace and other industrial fields [1]. However, limited room temperature formability greatly hinders their wide applications.…”

Thermal Conductivity of an AZ31 Sheet After Accumulative Roll Bonding

“…As it was shown in several papers, the microstructure and microstructure changes influence the thermal conductivity [12,13,[16][17][18][19][20][21][22][23][24][25]. The main changes in the microstructure occurred during the ARB process are grain refinement and development of the texture.…”

“…Mostly, binary and ternary magnesium alloys consist of -grains containing the solid solution of the alloying elements in Mg and various phases. Generally, the thermal conductivity depends on their composition and thermal history [9,11,[13][14][15][16][17][18][19][20][21][22][23][24][25]. Results of these studies were ambiguous.…”