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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Aging effects on microstructural and mechanical properties of select refractory metal alloys for space-reactor applications
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Aging effects on microstructural and mechanical properties of select refractory metal alloys for space-reactor applications

机译：时效对用于空间反应器的精选难熔金属合金的显微组织和力学性能的影响

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Refractory alloys based on niobium, tantalum and molybdenum are potential candidate materials for structural applications in proposed space nuclear reactors. Long-term microstructural stability is a requirement of these materials for their use in this type of creep dominated application. Early work on refractory metal alloys has shown aging embrittlement occurring for some niobium and tantalum-base alloys at temperatures near 40% of their melting temperatures in either the base metal or in weldments. Other work has suggested microstructural instabilities during long-term creep testing, leading to decreased creep performance. This paper examines the effect of aging 1100 h at 1098, 1248 and 1398 K on the microstructural and mechanical properties of two niobium (Nb–1Zr and FS-85), tantalum (T-111 and ASTAR-811C) and molybdenum (Mo–41Re and Mo–47.5Re) base alloys. Changes in material properties are examined through mechanical tensile testing coupled with electrical resistivity changes and microstructural examination through optical and electron microscopy analysis.
机译：基于铌，钽和钼的耐火合金是拟议中的空间核反应堆结构应用的潜在候选材料。这些材料在这种蠕变占主导地位的应用中必须具有长期的微观结构稳定性。难熔金属合金的早期工作表明，某些铌和钽基合金在接近其母材或焊件熔化温度40％的温度下会发生时效脆化。其他工作表明，在长期蠕变测试过程中微观结构不稳定性，导致蠕变性能下降。本文研究了1098、1248和1398 K下1100 h时效对两种铌（Nb-1Zr和FS-85），钽（T-111和ASTAR-811C）和钼（Mo- 41Re和Mo-47.5Re）基合金。通过机械拉伸试验，电阻率变化以及通过光学和电子显微镜分析进行的微观结构检查，可以检查材料性能的变化。

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