Yield behavior beneath hardness indentations in ductile metals, measured by three-dimensional computed X-ray tomography and digital volume correlation

Research output: Contribution to journalArticlepeer-review

Authors

  • M. Mostafavi
  • R. Bradley
  • R. C. Atwood
  • C. Reinhard
  • X. Jiang
  • M. Galano
  • P. D. Lee
  • T. J. Marrow

Colleges, School and Institutes

External organisations

  • University of Sheffield
  • University of Oxford
  • University of Manchester
  • Diamond Light Source

Abstract

Plastic deformation in the vicinity of hardness indentations in two ductile metals, an aluminium-silicon carbide composite (Al-SiC) and a cast magnesium alloy (WE43), was characterized. Using in situ and ex situ X-ray computed tomography with digital volume correlation, the three-dimensional full-field displacements beneath the indentations were measured; these show strong agreement with simulated predictions using finite element models. It is demonstrated that plastic material properties, i.e. yield stress and hardening exponent, may be extracted via analysis of the deformation field.

Details

Original languageEnglish
Pages (from-to)468-482
Number of pages15
JournalActa Materialia
Volume82
Early online date22 Oct 2014
Publication statusPublished - 1 Jan 2015

Keywords

  • Computed tomography, Digital image correlation, Finite element analysis, Indentation