Abstract
The extension of the solid-solubility limit obtained in Al-Fe alloys up to 4.4 at. pct Fe by rapid quenching from the melt and the appearance of metastable Al6Fe phase for 4 to 20 wt pct Fe have been reported in the past. Present experiments with isochronal and isothermal annealing of Al-Fe solid solutions containing 3.6 at. pct Fe have shown that the solutions are very stable at room temperature, and less stable at 200°C, while at 300°C they decompose very rapidly and a metastable Al6Fe phase appears. This phase is replaced by Al3Fe after annealing for 10 min at 550°C or for 16 hr at 400°C. The Al6Fe phase remains stable for 76 hr at 300°C, while taking more than 670 hr to be replaced by Al3Fe. The author discusses the operation of the “two-piston” quenching apparatus and concludes that the sample thickness cannot serve as a sufficient criterion for quenching effectiveness.
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Tonejc, A. X-ray study of the decomposition of metastable Al-rich Al-Fe solid solutions. Metall Trans 2, 437–440 (1971). https://doi.org/10.1007/BF02663331
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DOI: https://doi.org/10.1007/BF02663331