Investigation on micro-hardness with shear strain extent for copper specimens subjected to high pressure torsion

Yuan Liu; Youshi Hong; Keke Fan; Xiaodong Ji

doi:10.1117/12.839236

24 August 2009 Investigation on micro-hardness with shear strain extent for copper specimens subjected to high pressure torsion

Yuan Liu, Youshi Hong, Keke Fan, Xiaodong Ji

Author Affiliations +

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73752Z (2009) https://doi.org/10.1117/12.839236
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

High Pressure Torsion (HPT) is an effective way to diminish the size of the crystal particles and improve the mechanical performance of metal material. In this study, the micro-hardness, size of crystal particles and shear strain of copper samples treated with HPT and their relationship were investigated. The results showed that the micro-hardness of the HPT copper increases from 50 to 140 when the nominal shear strain increases from 0 to 5. Then it reached saturation state and the micro-hardness didn't increase obviously when the shear strain increased further. The grain size becomes smaller as the distance away from the centre of sample for the sample with fewer turns of torsion. For the sample with more turns of torsion, in addition to the grain size refinement, the micro-hardness reaches saturation and its spatial distribution is uniform both along thickness and radius direction.

Citation Download Citation

Yuan Liu, Youshi Hong, Keke Fan, and Xiaodong Ji "Investigation on micro-hardness with shear strain extent for copper specimens subjected to high pressure torsion", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73752Z (24 August 2009); https://doi.org/10.1117/12.839236

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