Hardening of an Al-Cu-Mg alloy containing type I and II S phase precipitates

Parel, T.S., Wang, S.C. and Starink, M.J. (2010) Hardening of an Al-Cu-Mg alloy containing type I and II S phase precipitates. Materials & Design, 31 (1), S2-S5. (doi:10.1016/j.matdes.2009.12.048).

Record type: Article

Abstract

The effect of different thermo-mechanical treatments on the hardness of the 2024 (Al-Cu-Mg) alloy was studied. Artificial ageing was conducted through heating at a constant rate to specific temperatures followed by rapid cooling. It was found that quenched only alloy 2024, which is found to form Type II S precipitates, possesses lower hardness compared to cold worked alloy 2024, on ageing to temperatures below 300°C. Cold working lowers the temperature required for S phase precipitation to start while decreasing the quenching rate is seen to give higher hardness on ageing to temperatures below 200°C. Type II S precipitate is found to result in lower hardening as compared to that due to Type I S precipitate. The reason for this is suggested to be due to the larger size of Type II S precipitate. The hardness of solution treated and subsequently cold worked and artificially aged 2024 is increased if the quenching is conducted in water at 80ºC, a slower quench. This effect is notable if the ageing temperature is below about 200ºC

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