Evaluation of irradiation hardening of proton irradiated stainless steels by nanoindentation
Evaluation of irradiation hardening of proton irradiated stainless steels by nanoindentation
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DOI：
10.1016/j.jnucmat.2013.12.009
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发表时间：
2014-03
影响因子：
3.1
通讯作者：
K. Yabuuchi;Y. Kuribayashi;S. Nogami;R. Kasada;A. Hasegawa
中科院分区：
文献类型：
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作者：
K. Yabuuchi;Y. Kuribayashi;S. Nogami;R. Kasada;A. Hasegawa
离子辐照实验是研究辐照损伤的有效手段。然而，估计离子辐照材料的辐照硬化是具有挑战性的，因为浅损伤诱导区域。因此，本研究的目的是证明有用的纳米压痕技术估计离子辐照材料的辐照硬化。采用SUS 316L奥氏体不锈钢，在573 K下，用1 MeV H+离子辐照，得到0.1，0.3，1和8dpa的名义位移损伤。采用Nix-Gao模型测量并分析了辐照试样的辐照硬度。压痕尺寸效应在未辐照和辐照试样中均观察到。在一定的压痕深度下，辐照试样的硬度发生显著变化。硬度变化的深度表明，压头变形的区域已经到达辐照区和未辐照区之间的边界。在Nix-Gao图中，辐照区域的硬度与压痕深度的倒数成正比。由Nix-Gao图估计的辐照区域的体硬度H 0和维氏硬度彼此相关，并且可以通过方程HV= 0.76H0来描述这种关系。因此，在这项研究中所展示的纳米压痕技术是有价值的测量离子辐照材料的辐照硬化。
Ion irradiation experiments are useful for investigating irradiation damage. However, estimating the irradiation hardening of ion-irradiated materials is challenging because of the shallow damage induced region. Therefore, the purpose of this study is to prove usefulness of nanoindentation technique for estimation of irradiation hardening for ion-irradiated materials. SUS316L austenitic stainless steel was used and it was irradiated by 1 MeV H+ions to a nominal displacement damage of 0.1, 0.3, 1, and 8 dpa at 573 K. The irradiation hardness of the irradiated specimens were measured and analyzed by Nix–Gao model. The indentation size effect was observed in both unirradiated and irradiated specimens. The hardness of the irradiated specimens changed significantly at certain indentation depths. The depth at which the hardness varied indicated that the region deformed by the indenter had reached the boundary between the irradiated and unirradiated regions. The hardness of the irradiated region was proportional to the inverse of the indentation depth in the Nix–Gao plot. The bulk hardness of the irradiated region,H0, estimated by the Nix–Gao plot and Vickers hardness were found to be related to each other, and the relationship could be described by the equation,HV= 0.76H0. Thus, the nanoindentation technique demonstrated in this study is valuable for measuring irradiation hardening in ion-irradiated materials.