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Motta, Antonella |
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Ali, M. A. |
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Azevedo, Nuno Monteiro |
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Hon, N.
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document
Effect of aluminum addition on the strengthening and high temperature deformation behavior of Mg-3Sn-2Ca alloy
Abstract
The hot working behavior of Mg-3Sn-2Ca-0.4Al alloy has been investigated in the temperature range 300-500 °C and strain rate range 0.0003-10 s <sup>-1</sup> with a view to evaluate the strengthening effect of aluminum addition and the hot deformation behavior. The stress-strain curves exhibited steady state behavior at strain rates lower than 0.01 s"1 and at temperatures higher than 350 °C and flow softening occurred at higher strain rates. There has been some strengthening due to aluminum addition particularly at lower temperatures compared to that of the base alloy Mg-3Sn-2Ca. Standard kinetic rate equation is obeyed in two different temperature and strain rate regimes and an analysis yielded app.arent activation energy values of 175 and 195 kJ/mole in the two regimes. These are similar to those obtained on the as-cast base alloy and are higher than that for self-diffusion in magnesium suggesting that the strengthening is essentially due to the large volume fraction of CaMgSn intermetallic particles present in the matrix which generate considerable back stress.