Surface modification of molten W exposed to high heat flux helium neutral beams

Surface modification of molten W exposed to high heat flux helium neutral beams
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暴露于高热通量氦中性束的熔融钨的表面改性

DOI:
10.1016/j.jnucmat.2013.02.043
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发表时间:
2013-06
影响因子:
3.1
通讯作者:
Liu, W.
Liu, W.
中科院分区:
工程技术2区
文献类型:
--
作者:
Yuan, Y.;Greuner, H.;Boeswirth, B.;Linsmeier, Ch.;Luo, G. -N.;Fu, B. Q.;Xu, H. Y.;Shen, Z. J.;Liu, W.

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用氦中性束对轧制钨进行了中心热流密度为10.5MW/m ~ 2的高热流密度实验。氦粒子的能量为33 keV,粒子通量为2× 1021 m-2s-1。对80×65× 3 mm 3的轧制钨板进行了4.6s脉冲辐照,使钨板表面部分熔化。然后用几个氦脉冲辐照钨板,其注量为1.2-2.5×1022/m2,峰值温度为1450 - 2590°C。实验表明:结果表明:(1)再凝固钨表面的氦致表面改性与非熔融钨表面的有很大的不同;(2)熔融钨表面的表面形貌与再凝固晶粒的取向密切相关;(3)熔融钨表面和非熔融钨表面的表面改性的演变都强烈依赖于表面温度和局部氦注量。
High heat flux tests with central heat flux of 10.5MW/m2using helium neutral beams have been carried out on rolled tungsten. The energy of helium particles is 33keV and the particle flux is 2×1021m−2s−1. An 80×65×3mm3rolled tungsten plate is firstly exposed to a 4.6s pulse resulting in partially molten surfaces. Thereafter the tungsten plate is irradiated by several helium pulses with fluences of 1.2–2.5×1022/m2and peak temperatures from 1450 to 2590°C. The experiments show that: (1) helium-induced surface modification of the resolidified tungsten surface is very different from that of the non-molten surface; (2) the surface morphology of molten surface is closely related to the orientation of the resolidified grain; (3) the evolution of surface modifications, for both of the molten and non-molten tungsten surfaces, indicates a strong dependence on the surface temperature and local helium fluence.
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