Article: The Effect of Heat Treatment on Mg^sub 2^Si Coarsening in Aluminum 6105 Alloy

The coarsening behavior of Mg^sub 2^Si intermetallic particles was studied during homogenization of aluminum 6105 alloy. An industrially homogenized 6105 aluminum alloy contained large globular undissolved Mg^sub 2^Si. With subsequent heat treatment at 590 °C over 1 week, it was found that the large Mg^sub 2^Si precipitates coarsened with time. The coarsening of the large Mg^sub 2^Si precipitates was quantified by statistical analysis of micrographs. A linear relationship between R¯^sup 3.8^ - R¯^sub i^^sup 3.8^ and time fits the experimental measurements quite well, indicating that the coarsening is diffusion controlled, with grain-boundary diffusion dominating volume diffusion.

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