未来聚变反应堆面向等离子体部件的增材制造材料的微观结构

D A H Wartacz, H Becker, S Antusch, N Ordás, C Gundlach, O V Mishin, W Pantleon
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引用次数: 0

摘要

聚变反应堆中的岔流器使用两种金属材料,它们是通过电子束熔化粉末床聚变制造的:钨作为面向等离子体的部件的铠装材料,可时效硬化的 CuCrZr 合金作为岔流器的散热材料。立方体由这两种材料加成制造而成,包含建造方向的横截面通过电子反向散射衍射进行表征。在钨的微观结构中观察到一种特殊的异质性,并可追溯到扫描策略。在横截面的两侧,即在垂直于印刷方向的观察平面上观察到晶粒的地方,可以看到沿构建方向略微向外倾斜的大型柱状晶粒。晶粒仅在中心略微拉长;当观察平面包含印刷方向时,既无法检测到晶粒的整个长度,也无法检测到晶粒的倾斜度。在 CuCrZr 合金中发现了许多附带的孪晶边界;这些孪晶边界的出现是由于存在几乎完美的 <110>纤维纹理。此外,X 射线计算机断层扫描证实 CuCrZr 试样的孔隙率很低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microstructure of additive manufactured materials for plasma-facing components of future fusion reactors
Two metallic materials considered for the divertor in fusion reactors are manufactured by powder bed fusion through electron beam melting: tungsten as armor of plasma-facing components and an age-hardenable CuCrZr alloy as heat sink material for the divertor. Cuboids are additively manufactured from both materials, and cross sections containing the build direction are characterized by electron backscatter diffraction. A peculiar heterogeneity is observed in the microstructure of tungsten and traced to the scanning strategy. Large columnar grains along the building direction with slight outward inclination are seen on both sides of the cross section i.e. where grains are observed in viewing planes perpendicular to the printing direction. Grains appear only slightly elongated in the center; neither their entire length nor their inclination is detected when the plane of view contains the printing direction. Many incidental twin boundaries are identified in the CuCrZr alloy; their occurrence is rationalized by the presence of an almost perfect <110> fiber texture. Additionally, X-ray computed tomography confirmed the low porosity of the CuCrZr specimen.
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