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

Ilya Nikulin; Rustam Kaibyshev; Sergey Mironov; Yutaka S. Sato; Hiroyuki Kokawa; Yoshinobu Motohashi

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

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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Superplasticity of a Sc and Zr Modified Al-6%Cu...

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

Abstract:

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.

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Materials Science Forum (Volumes 638-642)

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291-296

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.291

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Online since:

January 2010

Authors:

Ilya Nikulin, Rustam Kaibyshev, Sergey Mironov, Yutaka S. Sato, Hiroyuki Kokawa, Yoshinobu Motohashi

Keywords:

Aluminium Alloy, Equal Channel Angular Extrusion (ECAE), Fine-Grained Structure, Superplasticity

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