Quantifying early stage irradiation damage from nanoindentation pop-in tests

SCRIPTA MATERIALIA

卷:157

Article

Jin, K.¹  Xia, Y.²  Crespillo, M.²  Xue, H.²  Zhang, Y.^1,2  Gao, Y. F.^1,2  Bei, H.¹ 

[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[2] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

关键词: Ion irradiation;    Nanoindentation;    Pop-in;    Incipient plasticity;   

DOI  :  10.1016/j.scriptamat.2018.07.035

来源: Elsevier

【 摘 要 】

Early stage irradiation effects on incipient plasticity are quantitatively investigated in single-crystalline molybdenum using nanoindentation pop-in tests. Defects produced under low-dose ion irradiations, even when they are hardly detected by ion-channeling technique, can significantly reduce the critical stress for the elastic-plastic transition, through acting as heterogeneous dislocation nucleation sources. The density and strength of defects are derived using a unified model convoluting homogeneous and heterogeneous mechanisms. In addition to the increased defect density, defect strength is found to decrease with increasing irradiation dose, suggesting a growth in defect size, which is further evidenced by combined analyses between pop-in and hardness tests. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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