TY - JOUR
T1 - A mechanistic model for depth-dependent hardness of ion irradiated metals
AU - Xiao, Xiazi
AU - Chen, Qianying
AU - Yang, Hui
AU - Duan, Huiling
AU - Qu, Jianmin
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/3/1
Y1 - 2017/3/1
N2 - A mechanistic model was developed for modeling the depth-dependent hardness in ion irradiated metallic materials. The model is capable of capturing the indentation size effect, ion irradiation induced damage gradient effect, and effect of unirradiated region acting as a soft substrate. A procedure was developed and described in detail to parametrize the model based on experimentally obtained hardness vs. indentation depth curves. Very good agreement was observed between our model predictions and experimental data of several different stainless steels subjected to various ion irradiation conditions. In addition, two hardening mechanisms are revealed in the new model. One is the well-known indentation size effect arising from the creation of geometrically necessary dislocations as the indenter pierces into the materials. The other is the irradiation hardening due to the presence of irradiation-induced defects. As a function of indentation depth h, the hardening due to indentation size effect is described by h¯∗/h, while the hardening due to irradiation first follows a power law form Phn, then changes to Z/h−Q/h3, where h¯∗, P, n, Z and Q>0 are constants. This transition occurs at the indentation depth when the plastic zone reaches the end of the irradiated layer.
AB - A mechanistic model was developed for modeling the depth-dependent hardness in ion irradiated metallic materials. The model is capable of capturing the indentation size effect, ion irradiation induced damage gradient effect, and effect of unirradiated region acting as a soft substrate. A procedure was developed and described in detail to parametrize the model based on experimentally obtained hardness vs. indentation depth curves. Very good agreement was observed between our model predictions and experimental data of several different stainless steels subjected to various ion irradiation conditions. In addition, two hardening mechanisms are revealed in the new model. One is the well-known indentation size effect arising from the creation of geometrically necessary dislocations as the indenter pierces into the materials. The other is the irradiation hardening due to the presence of irradiation-induced defects. As a function of indentation depth h, the hardening due to indentation size effect is described by h¯∗/h, while the hardening due to irradiation first follows a power law form Phn, then changes to Z/h−Q/h3, where h¯∗, P, n, Z and Q>0 are constants. This transition occurs at the indentation depth when the plastic zone reaches the end of the irradiated layer.
KW - Finite element modeling
KW - Hardness
KW - Irradiation effect
KW - Stainless steel
KW - Theoretical model
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U2 - 10.1016/j.jnucmat.2016.12.039
DO - 10.1016/j.jnucmat.2016.12.039
M3 - Article
AN - SCOPUS:85007586441
SN - 0022-3115
VL - 485
SP - 80
EP - 89
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -