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Mechanical Properties of Nanocrystalline Cu and Cu-Zn Using Tensile and Shear Punch Tests

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Abstract:

Shear punch test (SPT) has been used to study the mechanical properties of Cu, Cu–10 wt.% Zn, Cu–20 wt.% Zn and Cu–30 wt.% Zn after ball milling with an average grain size in the range of 33-12nm. The strain rate sensitivity (SRS) and physical activation volume have been determined. The magnitude observed for these characteristic deformation parameters is very different from their course-grained (cg) counterpart. This suggests that the thermally activated process in nanocrystalline (nc) metal/alloys is different from the conventional forest dislocation cutting mechanism. The stacking fault energy (SFE) of Cu-Zn alloys decreased with the adding of Zn, and deformation twins are anticipated to introduce into the nc Cu-Zn alloys during process of ball milling. Dislocations could accumulate along the TBs and carry the plastic strain, so the ductility of nc Cu-Zn alloys could be improved.

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Periodical:

Materials Science Forum (Volumes 633-634)

Pages:

373-382

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.633-634.373

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Online since:

November 2009

Authors:

J.M. Tao, Xin Kun Zhu, P.Z. Wong, Ron O. Scattergood, Carl C. Koch

Keywords:

Copper (Cu), Mechanical Property, Nanocrystalline Metals, Shear Punch Test, Strain Rate

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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