Abstract
Grain refinement during equal-channel angular pressing (ECAP) was studied in a commercial Al5.8%Mg0.3%Sc alloy at temperatures from 473 to 723K (³0.50.8Tm). The samples were quenched in water in every ECAP pass, which is a conventional cyclic process. ECAP to ¾ = 12 resulted in ultrafine-grained structures developed uniformly at high strains at 473 and 723K, while processing at 573K led to the evolution of a duplex grain structure containing partially much coarser grains. In contrast, ECAP process continuously carried out to ¾ = 12 without interruption at 573K, resulted in development of a uniform ultrafine-grained structure. Effects of processing regimes on microstructural evolution in the AlMgSc alloy are discussed. [doi:10.2320/matertrans.MD201108]
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