Abstract
The effect of reversion treatments on an Al-1.35 at. pct Mg2Si alloy fully age hardened for 24 h at 160°C was studied by electron microscopy and tension tests. This alloy aged to full strength at 160°C did not show true reversion when heated 15 min at 200 to 300°C. The G.P. zones did not dissolve rapidly at a particular temperature but instead were replaced by the more stable phase, β′ (the intermediate partially coherent form of Mg2Si). After reheating the fully age hardened alloy 15 min at 250°C, a slight increase in strength was obtained, but the ductility was slightly lowered. Reversion treatments at higher temperatures (275 to 300°C) gradually decreased the strength of the alloy. Two simultaneous reactions are believed to occur during the reversion treatments: 1) the growth of some of the G.P. zones and the dissolution of others and 2) the formation of needles of β′.
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Smith, W.F. The effect of reversion treatments on precipitation mechanisms in an Al-1.35 at. pct Mg2Si alloy. Metall Trans 4, 2435–2440 (1973). https://doi.org/10.1007/BF02669387
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DOI: https://doi.org/10.1007/BF02669387