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Superplastic Deformation and Mechanisms of the Commercial Aluminium Alloy Al-4Cu-I.6Mg-0. 8Mn

Published online by Cambridge University Press:  16 February 2011

Yuwen Liu ,
Guang Yang ,
Jianshe Lian  and
Xianwen Zeng
Yuwen Liu
Affiliation:
Jilin University of Technology, Dept.of Metal Materials Engineering, Changchun, 130025, P.R. China
Guang Yang
Affiliation:
Jilin University of Technology, Dept.of Metal Materials Engineering, Changchun, 130025, P.R. China
Jianshe Lian
Affiliation:
Jilin University of Technology, Dept.of Metal Materials Engineering, Changchun, 130025, P.R. China
Xianwen Zeng
Affiliation:
Jilin University of Technology, Dept.of Metal Materials Engineering, Changchun, 130025, P.R. China
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Abstract

The superplastic deformation behavior and mechanisms of commercial Al-4cu-1.6 Mg-0.0Mn have been studied, using tensile tests with microstructuraL observations being carried out by optical and transmission etectronmicroscopy. The results of tensile tests show that considerable superplasticflow can be obtained without any pretreatment to this atloy.The maximum elongaton achieved is 42096 and the strain rate sensitivity index, m, is 0.49. Microstructural analysis reveals that the dominant mechanism in the early stage of deformation is diffusion. As strain increases, grain-borundary sliding and grain rearrangment take the dominant part in thedeformation process, and diffusion becomes an accommodation mechanism. Second phase particles effectively restrict grain growth during deformation. Cavity initiation and growth during deformation are the direct cause of specimen failure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 196: Symposium T – Superplasticity in Metals, Ceramics, and Intermetallics , 1990 , 391
Copyright
Copyright © Materials Research Society 1990

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References

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