Abstract
Aluminum-based alloys are the most popular structural materials. Strength and refractoriness can be improved by doping with transition metals; this effect can be amplified by fast quenching from liquid state, which will expand the solid-solution regions and disperse the intermediate phases in transition metal-aluminum alloys. The decomposition of supersaturated solid solutions (SSS) under special conditions releases the fine-dispersed hardening intermetallic phases, which boosts the strength of the alloy. The way fast-quenched Al-Co-Zr and Al-Fe-Co-Zr alloys change their microhardness after isothermic annealing at 470, 570, or 670 K indicates dispersion hardening. Durometer testing points to a considerable hardening of fast-quenched Al-Co-Zr and Al-Fe-Co-Zr alloys, which is caused by the decomposition of supersaturated solid solutions. Staging the decomposition of Co, Zr, or Fe SSS in aluminum helps predict how the doping additives as well as the temperature and timing of subsequent thermal treatment affect the strength of aluminum alloys.
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