Abstract
The objective of this work has been the study of the microstructure and the thermal stability of the alloy Mg-2.3 %Zr grown by Physical Vapour Deposition. This study has been carried out by Differential Scanning Calorimetry and Transmission Electron Microscopy. The alloy in the as-deposited condition consists of a solid solution of zirconium atoms in the magnesium matrix. The microstructure of the alloy is characterised by elongated grains oriented in the growth direction. These grains grow with the [0001] direction parallel to the deposit growth direction. During a continuous heating, the deposit shows three exothermal transformations which have been associated with a recovery process, the zirconium precipitation in the magnesium matrix and oxidation at high temperatures. The activation energy for the precipitation reaction calculated from Kissinger analysis is 139 kjmol -1 .
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