Re-examination of "missing strain" during superplastic deformation of AA7475

M. J. Tan; C. L. Chen; Namas Chandra

doi:10.1016/j.msea.2004.03.034

Re-examination of "missing strain" during superplastic deformation of AA7475

M. J. Tan, C. L. Chen, Namas Chandra

Research output: Contribution to journal › Article › peer-review

Abstract

"Missing strain", a discrepancy between the total macroscopic strain and the strain contributed by grain boundary sliding (GBS) during superplastic deformation, appears to exist in previous investigations. In this work, the contribution of GBS (ξ_GBS) and intragranular strain (ξ_IG) were simultaneously measured using scratch test conducted on AA7475 samples after deformation at 500°C at initial strain rate of 10^-3s^-1. The result shows that the missing strain results most probably from the neglect of the intragranular strain as well as the anisotropic GBS-induced underestimation of ξ_GBS. The calculation of ξ_GBS was re-examined, based on the fact that anisotropic shrinkage of samples along width and thickness during superplastic deformation was noted.

Original language	English (US)
Pages (from-to)	369-373
Number of pages	5
Journal	Materials Science and Engineering: A
Volume	374
Issue number	1-2
DOIs	https://doi.org/10.1016/j.msea.2004.03.034
State	Published - Jun 15 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Keywords

Grain boundary sliding
Missing strain
Superplastic deformation

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10.1016/j.msea.2004.03.034

Cite this

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title = "Re-examination of {"}missing strain{"} during superplastic deformation of AA7475",

abstract = "{"}Missing strain{"}, a discrepancy between the total macroscopic strain and the strain contributed by grain boundary sliding (GBS) during superplastic deformation, appears to exist in previous investigations. In this work, the contribution of GBS (ξGBS) and intragranular strain (ξIG) were simultaneously measured using scratch test conducted on AA7475 samples after deformation at 500°C at initial strain rate of 10-3s-1. The result shows that the missing strain results most probably from the neglect of the intragranular strain as well as the anisotropic GBS-induced underestimation of ξGBS. The calculation of ξGBS was re-examined, based on the fact that anisotropic shrinkage of samples along width and thickness during superplastic deformation was noted.",

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TY - JOUR

T1 - Re-examination of "missing strain" during superplastic deformation of AA7475

AU - Tan, M. J.

AU - Chen, C. L.

AU - Chandra, Namas

PY - 2004/6/15

Y1 - 2004/6/15

N2 - "Missing strain", a discrepancy between the total macroscopic strain and the strain contributed by grain boundary sliding (GBS) during superplastic deformation, appears to exist in previous investigations. In this work, the contribution of GBS (ξGBS) and intragranular strain (ξIG) were simultaneously measured using scratch test conducted on AA7475 samples after deformation at 500°C at initial strain rate of 10-3s-1. The result shows that the missing strain results most probably from the neglect of the intragranular strain as well as the anisotropic GBS-induced underestimation of ξGBS. The calculation of ξGBS was re-examined, based on the fact that anisotropic shrinkage of samples along width and thickness during superplastic deformation was noted.

AB - "Missing strain", a discrepancy between the total macroscopic strain and the strain contributed by grain boundary sliding (GBS) during superplastic deformation, appears to exist in previous investigations. In this work, the contribution of GBS (ξGBS) and intragranular strain (ξIG) were simultaneously measured using scratch test conducted on AA7475 samples after deformation at 500°C at initial strain rate of 10-3s-1. The result shows that the missing strain results most probably from the neglect of the intragranular strain as well as the anisotropic GBS-induced underestimation of ξGBS. The calculation of ξGBS was re-examined, based on the fact that anisotropic shrinkage of samples along width and thickness during superplastic deformation was noted.

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KW - Missing strain

KW - Superplastic deformation

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JO - Materials Science and Engineering: A

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ER -

Re-examination of "missing strain" during superplastic deformation of AA7475

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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