Evolution of voids during ductile crack propagation in an aluminium alloy sheet toughness test studied by synchrotron radiation computed tomography

被引：67

作者：

Morgeneyer, T. F. ^{[1
,2
]}

Starink, M. J. ^{[1
]}

Sinclair, I. ^{[1
]}

机构：

[1] Univ Southampton, Mat Res Grp, Sch Engn Sci, Southampton SO17 1BJ, Hants, England

[2] Alcan Ctr Rech Voreppe, F-38341 Voreppe, France

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 08期

关键词：

aluminium alloys; ductile fracture; synchrotron radiation computed tomography; anisotropy; non-spherical voids;

D O I：

10.1016/j.actamat.2007.12.019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The anisotropy of fracture toughness in AA2139 (Al-Cu-Mg) alloy sheet has been investigated via synchrotron radiation computed tomography of arrested cracks in Kahn tear test pieces for different loading cases. The three-dimensional distribution and morphology of pores and defects in the as-received state are seen to be anisotropic, with chains of voids and void elongation in the L (longitudinal) direction. For toughness testing in L-T orientation (T is long transverse), voids ahead of the crack grow and link in the L direction. In T-L tests, voids ahead of the crack tip also grow in the loading direction, although a high degree of alignment is retained in the L direction. The present work provides quantitative microstructural data that can be used as input for and validation of recent idealized model formulations, and it is shown that the measured void dimensions and evolution are consistent with measured toughness anisotropy. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1671 / 1679

页数：9

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