Superplasticity of a Sc and Zr Modified Al-6%Cu Alloy Subjected to ECAE

Abstract:

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Superplasticity in an Al-6%Cu-0.45%Mg-0.4%Mn-0.16%Sc-0.12%Zr alloy subjected to intense plastic straining through equal-channel angular extrusion (ECAE) was studied in tension at strain rates ranging from 5.6×10-4 to 5.6×10-3 s-1 in the temperature interval 350-450°C. The alloy had a non-uniform microstructure with an average crystallite size of 1.2 m. The volume fraction of high-angle grain boundaries was about 57%. In spite of small crystallite size the alloy shows moderate superplastic properties. The highest elongation-to-failures of 320% appeared at a temperature of ~425°C and an initial strain rate of ~1.410-3 s-1, where the strain rate sensitivity coefficient, m, was about 0.33. The relationship between superplastic ductilities and microstructure stability is analyzed.

Info:

Periodical:

Materials Science Forum (Volumes 638-642)

Main Theme:

Edited by:

T. Chandra, N. Wanderka, W. Reimers , M. Ionescu

Pages:

291-296

DOI:

10.4028/www.scientific.net/MSF.638-642.291

Citation:

I. Nikulin et al., "Superplasticity of a Sc and Zr Modified Al-6%Cu Alloy Subjected to ECAE", Materials Science Forum, Vols. 638-642, pp. 291-296, 2010

Online since:

January 2010

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$35.00

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