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Effects of cold reduction and heat-treatments on the Fe precipitation behavior in high purity aluminum with 55 ppm Fe were investigated by Mossbauer spectrometry using 90% enriched 57Fe. It has been revealed that the precipitated fraction of Fe becomes maximum by a heat treatment at 310°C in supersaturated solid solutions with high density dislocation introduced by 97% cold reduction. The precipitates in the 310°C aging sample are probably metastable Al6Fe compound. Moreover, it was found that the precipitation starts even at 120°C and by 200°C aging, the precipitated fraction reaches more than a half of the maximum value. However, these precipitates observed in low temperature aging seem not to be the definite Al6Fe compound but something like precarious phase leading to Al6Fe because they easily disappear by additional cold-rolling and Mossbauer spectrum is slightly different from those of high temperature aging samples. Scarcely any precipitates were found in supersaturated solid solution without cold rolling for any aging temperatures below 300°C, indicating the crucial role of dislocations for precipitation process.

Effects of cold rolling and heat treatment on Fe precipitation in aluminum by Moessbauer spectrometry.