Paper Title:
Effect of ECAP on Microstructure and Mechanical Properties of an Al-Mg-Sc Alloy
  Abstract

An Al-4.57%Mg–0.2%Sc was subjected to equal channel angular pressing up to fixed true strains of 1, 2, 4, 8 and 12 at a temperature of 300oC. It was shown that extensive grain refinement occurs in this alloy through continuous dynamic recrystallization. As a result, ECAP can provide the formation of subgrain structure, partially recrystallized structure and fully recrystallized structure. The type of structure evolved is dependent on strain imposed. At ε2, the formation of three-dimensional arrays of low-angle boundaries takes place. Next, in the strain interval from 4 to 8 these low-angle boundaries gradually convert into high-angle boundaries. At ε12, fully recrystallized structure is evolved. Yield stress and ultimate strength gradually increases with increasing strain. Mechanisms of strengthening are discussed.

  Info
Periodical
Materials Science Forum (Volumes 667-669)
Edited by
Jing Tao Wang, Roberto B. Figueiredo and Terence G. Langdon
Pages
949-954
DOI
10.4028/www.scientific.net/MSF.667-669.949
Citation
A. Mogucheva, R. Kaibyshev, "Effect of ECAP on Microstructure and Mechanical Properties of an Al-Mg-Sc Alloy", Materials Science Forum, Vols. 667-669, pp. 949-954, 2011
Online since
December 2010
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$32.00
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