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magnesium aluminum alloy powder is a mixture of magnesium with aluminium and other metal materials such as zinc, copper, silicon, rare earths and zirconium. It is a light structural material and its good machinability makes it useful for die-casting and continuous casting. It can also be used for powder metallurgy and spraying. It has the advantage of having good batch stability, sphericity and low oxygen content.
The TG-DSC curve of the Mg-Al alloy shows a clear and sharp exothermic peak at about 1000 degC, followed by a smoothing period and subsequently a further sharp exothermic peak at about 1500 degC. This indicates that the magnesium oxidation takes place at a lower temperature than that of the other elements in the alloy, as expected.
When mechanically mixed, Mg and HA particles, the resulting magnesium alumina nanocomposite exhibits lamellar structures, where the individual Mg flakes coated with HA are bonded together during sintering (Fig. 15.8). The morphology of the composites is determined by the ratio of Mg/HA. Increasing the Mg/HA ratio increases the ductility of the materials, due to the activation of non-basal slip systems and improved cross-slip.
When the Mg/HA ratio is increased to 12:1, 19:1 and 25:1, the tensile strength increases correspondingly, but the UTS decreases, probably because of a reduction in ductility through a thinning of the matrix. However, the addition of yttria reduces the CTE and improves ductility, which may be because of the high melting point of yttria (