Quantitative study of grain refinement in Al-Mg alloy processed by equal channel angular pressing at cryogenic temperature
Journal article, Peer reviewed
Accepted version
Permanent lenke
http://hdl.handle.net/11250/2462581Utgivelsesdato
2011Metadata
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- Institutt for materialteknologi [2562]
- Publikasjoner fra CRIStin - NTNU [38679]
Originalversjon
Materials letters (General ed.). 2011, 65 (23-24), 3472-3475. 10.1016/j.matlet.2011.07.067Sammendrag
Strain induced grain refinement of an Al–1 wt.% Mg alloy processed by equal channel angular pressing (ECAP) at cryogenic temperature is investigated quantitatively. The results show that both mean grain and subgrain sizes are reduced gradually with increasing ECAP pass. ECAP at cryogenic temperature increases the rate of grain refinement by promoting the fraction of high angle grain boundaries (HAGBs) and misorientation at each pass. The fraction of HAGBs and the misorientation of Al–1 wt.% Mg alloy during ECAP at cryogenic temperature increase continuously as a function of equivalent strain. Both {110} and {111} twins at ultrafine-grained size are observed firstly in Al–Mg alloy during ECAP. The analysis of grain boundaries and misorientation gradients demonstrates the grain refinement mechanism of continuous dynamic recrystallization.