Elsevier

Materials Science and Engineering: A

Volume 625, 11 February 2015, Pages 380-384
Materials Science and Engineering: A

High temperature indentation of helium-implanted tungsten

https://doi.org/10.1016/j.msea.2014.12.034Get rights and content
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Abstract

Nanoindentation has been performed on tungsten, unimplanted and helium-implanted to ~600 appm, at temperatures up to 750 °C. The hardening effect of the damage was 0.90 GPa at 50 °C, but is negligible above 450 °C. The hardness value at a given temperature did not change on re-testing after heating to 750 °C. This suggests that the helium is trapped in small vacancy complexes that are stable to at least 750 °C, but which can be bypassed due to increased dislocation mobility (cross slip or climb) above 450 °C.

Keywords

Hardness measurement
Nanoindentation
Hardening

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