Measurements of plastic displacement gradient components in three dimensions using marker particles and synchrotron X-ray absorption microtomography

被引：91

作者：

Nielsen, SF ^{[1
]}

Poulsen, HF

Beckmann, F

Thorning, C

Wert, JA

机构：

[1] Riso Natl Lab, Ctr Fundamental Res Met Struct Dimens 4, DK-4000 Roskilde, Denmark

[2] DESY, HASYLAB, Hamb Synchrotronstrahlungslab, D-22607 Hamburg, Germany

来源：

ACTA MATERIALIA | 2003年 / 51卷 / 08期

关键词：

synchrotron radiation; plastic deformation; X-ray tomography; image analysis; aluminium;

D O I：

10.1016/S1359-6454(03)00053-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A universal method is presented for characterising the three-dimensional (3D) plastic displacement gradient field in bulk materials that contain particles or voids observable by X-ray tomography. Millimetre sized samples are investigated by absorption contrast microtomography using high intensity X-rays from a synchrotron source. The positions of dispersed marker particles are determined as a function of imposed strain. The particle diameter can be in the micrometre range, and the volume fraction can be less than 1%. The method is demonstrated by evaluation of compression deformation of a cylindrical Al specimen containing W marker particles. By interpolating the displacement gradient components determined at each particle on a 30 x 30 x 30 mum(3) grid, 3D maps of the displacement gradient components are obtained with a resolution of 10(-2) in each component. Limitations of the method are discussed, and the potential for application in materials science is outlined. (C) 2003 Published by Elsevier Science Ltd on behalf of Acta Materialia Inc.

引用

页码：2407 / 2415

页数：9

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