High temperature indentation of helium-implanted tungsten

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:625

Article

Gibson, James S. K. -L.¹  Roberts, Steve G.^1,2  Armstrong, David E. J.¹ 

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[2] Culham Sci Ctr, Culham Ctr Fus Energy, Abingdon OX14 3DB, Oxon, England

关键词: Hardness measurement;    Nanoindentation;    Hardening;   

DOI  :  10.1016/j.msea.2014.12.034

来源: Elsevier

【 摘 要 】

Nanoindentation has been performed on tungsten, unimplanted and helium-implanted to similar to 600 appm, at temperatures up to 750 degrees C. The hardening effect of the damage was 0.90 GPa at 50 degrees C, but is negligible above 450 degrees C. The hardness value at a given temperature did not change on re-testing after heating to 750 degrees C. This suggests that the helium is trapped in small vacancy complexes that are stable to at least 750 degrees C, but which can be bypassed due to increased dislocation mobility (cross slip or climb) above 450 degrees C. (C) 2014 The Authors. Published by Elsevier B.V.

【 授权许可】

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