Irradiation hardening behaviors of tungsten-potassium alloy studied by accelerated 3-MeVW2+ ions
Irradiation hardening behaviors of tungsten-potassium alloy studied by accelerated 3-MeVW2+ ions
复制标题
3-MeVW2离子加速研究钨钾合金的辐照硬化行为
DOI：
10.1088/1674-1056/ab75cf
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发表时间：
2020
影响因子：
1.7
通讯作者：
Tang Jun
中科院分区：
文献类型：
--
作者：
Yang Xiao-Liang;Chen Long-Qing;Qiu Wen-Bin;Song Yang-Yi-Peng;Tang Yi;Cui Xu-Dong;Liu Chang-Song;Jiang Yan;Zhang Tao;Tang Jun
采用火花等离子烧结和轧制工艺制备了具有超细/细晶粒和纳米k气泡的钨钾（WK）合金。本研究采用3-MeV双列加速器的w2 +离子辐照来模拟中子引起的位移损伤。由于辐照损伤层深度仅为500nm，通过Bercovich尖端纳米压痕试验和其他形态学表征研究了WK合金和ITER -W在不同损伤水平下的硬化行为。压头尺寸效应（ISE）、软基材效应（SSE）和损伤梯度效应（DGE）影响了纳米硬度的测量。在辐照样品中观察到很少或没有弹出，而在未辐照的金属中发生可见的弹出事件。在WK和ITER-W中，压痕周围都存在不同形态特征的大量堆积。在相同的位移损伤条件下，WK的硬度增量小于ITER-W。本研究为WK合金作为一种有前途的等离子体表面材料（PFMs）提供了有益的信息。(纸)
Tungsten–potassium (WK) alloy with ultrafine/fine grains and nano-K bubbles is fabricated through spark plasma sintering (SPS) and rolling process. In this study, 3-MeV W 2+ ion irradiation with a tandem accelerator is adopted to simulate the displacement damage caused by neutrons. As the depth of irradiation damage layer is limited to only 500 nm, the hardening behaviors of WK alloy and ITER (International Thermonuclear Experimental Reactor)-W under several damage levels are investigated through Bercovich tip nanoindentation test and other morphological characterizations. The indenter size effect (ISE), soft substrate effect (SSE), and damage gradient effect (DGE) are found to influence the measurement of nano-hardness. Few or no pop-ins in irradiated samples are observed while visible pop-in events take place in unirradiated metals. Extensive pile-up with different morphology features around the indentation exists in both WK and ITER-W. The WK shows a smaller hardness increment than ITER-W under the same condition of displacement damage. This study provides beneficial information for WK alloy serving as a promising plasma facing materials (PFMs) candidate.(paper)