Change in nanoindentation hardness of polycrystalline tungsten irradiated with Fe ions or electrons by hydrogen gas charging
Change in nanoindentation hardness of polycrystalline tungsten irradiated with Fe ions or electrons by hydrogen gas charging
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DOI：
10.1016/j.jnucmat.2021.153483
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发表时间：
2021-12
影响因子：
3.1
通讯作者：
Koichi Sato;R. Kasada;Atsushi Kiyohara;Masashi Hirabaru;K. Nakano;K. Yabuuchi;M. Hatakeyama;
中科院分区：
文献类型：
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作者：
Koichi Sato;R. Kasada;Atsushi Kiyohara;Masashi Hirabaru;K. Nakano;K. Yabuuchi;M. Hatakeyama;
采用纳米压痕试验研究了氢原子对未辐照、离子辐照和电子辐照多晶钨样品硬度的影响。未辐照和电子辐照钨样品的体积等效硬度在充氢后没有变化。充氢后，离子辐照钨的体积当量硬度增加。在位错环处捕获的氢原子的数量是非常小的。我们估计空位簇中的氢占有率为0.24 - 0.45（在三空位的情况下，每个空位捕获的氢原子数（H/V）为1.04 - 1.95）。由于辐照温度为573 K，在543 K充氢过程中辐照缺陷的密度和尺寸没有发生变化。因此，硬化主要是由含氢原子的空位簇的障碍强度α增加约8 - 11%引起的。离子辐照区域在充氢后硬化，并改变了堆积的构型。为了弄清充氢硬化的机理，需要观察位错结构。
The effects of hydrogen atoms on the hardnesses of unirradiated, ion-irradiated, and electron-irradiated polycrystalline tungsten samples were investigated using nanoindentation tests. The bulk equivalent hardnesses of the unirradiated and electron-irradiated tungsten samples did not change upon hydrogen charging. The bulk equivalent hardness of the ion-irradiated tungsten increased upon the hydrogen charging. The number of hydrogen atoms trapped at dislocation loops was very small. We estimated that the hydrogen occupancy in vacancy clusters was 0.24−0.45 (in the case of tri-vacancies, the number of hydrogen atoms trapped per vacancy (H/V) is 1.04−1.95). Because of the irradiation temperature of 573 K, the density and size of irradiation-induced defects did not change during hydrogen charging at 543 K. Therefore, the hardening was mainly caused by an increase of approximately 8 − 11% in the obstacle strengthαof vacancy clusters containing hydrogen atoms. The ion-irradiated area hardened upon the hydrogen charging and changed the configuration of the pile-up. Observation of the dislocation structure is required to clarify the mechanism of hardening caused by hydrogen charging.