Abstract
Abstract. The mechanical properties and microstructure of an ultrafine-grained Cu–Al alloy before and after annealing are investigated. Ultrafine-grained Cu–Al alloy samples are processed by means of rolling at ambient temperature and rolling reduction exceeds 90%. It is found that the strength of ultrafine-grained Cu–Al alloy increased rather than decreased after annealing for 1 h in the temperature range between150°Cand 300°C.Based on the microstructures observation of samples, it can be known that both the grain size and dislocation density have main effects on hardening of ultrafine-grained Cu–Al alloy which result from annealing. These investigations showed that the annealing hardening effect can be explained by the change of dislocation density and twin density.
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