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An investigation of ductility and microstructural evolution in an Al−3% Mg alloy with submicron grain size

Published online by Cambridge University Press:  03 March 2011

Jingtao Wang ,
Zenji Horita ,
Minoru Furukawa ,
Minoru Nemoto ,
Nikolai K. Tsenev ,
Ruslan Z. Valiev ,
Yan Ma  and
Terence G. Langdon
Jingtao Wang
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812, Japan
Zenji Horita
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812, Japan
Minoru Furukawa
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812, Japan
Minoru Nemoto
Affiliation:
Department of Materials Science and Engineering, Kyushu University, Fukuoka 812, Japan
Nikolai K. Tsenev
Affiliation:
Institute for Metals Superplasticity Problems, Russian Academy of Sciences, Ufa 450001, Russia
Ruslan Z. Valiev
Affiliation:
Institute for Metals Superplasticity Problems, Russian Academy of Sciences, Ufa 450001, Russia
Yan Ma
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, California 90089-1453
Terence G. Langdon
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, California 90089-1453
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Abstract

A submicrometer-grained (SMG) Al−3% Mg solid solution alloy, with an initial grain size of ∼0.2 μm, was produced by intense plastic straining. Experiments show that tensile specimens of the SMG alloy exhibit high elongations to failure at low testing strain rates at the relatively low temperature of 403 K. The stress exponent is high (∼7–8) and calculations show deformation is within the region of power-law breakdown. The initial microstructure of the alloy consists of diffuse boundaries between highly deformed grains. At strain rates of ∼10−4 s−1 and lower, plastic deformation leads to dynamic recrystallization and the formation of highly nonequilibrium grain boundaries that gradually evolve into a more equilibrated configuration.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 11 , November 1993 , pp. 2810 - 2818
Copyright
Copyright © Materials Research Society 1993

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