Mechanical Properties of Self-Ion Irradiated Pure Tungsten using Nano-Indentation Test and Micro-Tensile Test
Mechanical Properties of Self-Ion Irradiated Pure Tungsten using Nano-Indentation Test and Micro-Tensile Test
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DOI：
10.1016/j.nme.2022.101145
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发表时间：
2022-02
影响因子：
2.6
通讯作者：
J.H. Yu;H. Kurotaki;M. Ando;T. Nozawa
中科院分区：
文献类型：
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作者：
J.H. Yu;H. Kurotaki;M. Ando;T. Nozawa
现有的纳米压痕方法和发展中的微拉伸测试方法更有吸引力，在准确地定义辐照对力学行为的影响，并在本研究中采用，以确定纯钨的详细辐照行为。纯钨（A.L.M.T.）公司，日本）通过粉末冶金和热轧工艺生产的纯度为99.99重量%。在500和800 ℃下，通过TIARA（用于高级辐射应用的高崎离子加速器）进行最大18.0 dpa的辐照。利用聚焦离子束加工机加工了规格截面约为0.8 μ m（宽）× 0.8 μm（厚）× 10 μm（长）的微拉伸试样。纳米压痕结果表明，辐照硬化的饱和和辐照温度依赖性。在500℃时，纯钨在TIARA中辐照后的压痕硬度随辐照剂量的增加而增加，辐照至1.0dpa时硬度达到6.5GPa。在1.0dpa以上，压痕硬度趋于常数。在800℃下，辐照至3.0 dpa时，压痕硬度达到8.1 GPa，达到辐照硬化饱和，并且通过微拉伸实验得到的应力-应变曲线，发现与纳米压痕结果相似的趋势。此外，在这些测试中，钨微试样在所有条件下均显示出韧性断裂。总延伸率与辐照剂量和辐照温度无关。
The existing nano-indentation method and developmental micro-tensile testing method are more attractive in accurately defining the irradiation effect on the mechanical behavior and adopted in this study to identify the detailed irradiation behavior of pure tungsten. The pure tungsten (A.L.M.T. Corp., Japan) produced by the powder metallurgy and hot-rolling process has a purity of 99.99 wt%. The irradiation was conducted to a maximum of 18.0 dpa by the TIARA (Takasaki Ion Accelerators for Advanced Radiation Application) at 500 and 800 ℃. The micro-tensile specimens with the gauge section of about 0.8 µm (width) × 0.8 µm (thickness) × 10 µm (length) were machined by a focused ion beam device. The nano-indentation results showed the saturation of irradiation hardening and its irradiation temperature dependence. In the case of 500℃, the indentation hardness of pure tungsten irradiated in TIARA increased with increasing dose, and it reached 6.5 GPa after irradiation to 1.0 dpa. Beyond 1.0 dpa, indentation hardness approached a constant. In the case of 800℃, indentation hardness reached 8.1 GPa by irradiation to 3.0 dpa with an irradiation hardening saturation.Moreover, with the stress vs. strain curve by the micro-tensile tests, we found a similar tendency to the nano-indentation results. Additionally, tungsten micro specimens showed a ductile fracture at all conditions in these tests. The total elongation was independent of irradiation dose and irradiation temperature.