Microstructural control to improve the resistance to radiation embrittlement in vanadium
Microstructural control to improve the resistance to radiation embrittlement in vanadium
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DOI：
10.1016/j.jnucmat.2004.12.017
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发表时间：
2005-08
影响因子：
3.1
通讯作者：
H. Kurishita;T. Kuwabara;M. Hasegawa;S. Kobayashi;K. Nakai
中科院分区：
文献类型：
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作者：
H. Kurishita;T. Kuwabara;M. Hasegawa;S. Kobayashi;K. Nakai
为了提高难熔金属抗严重辐射脆化的能力，提出了一种控制显微组织的方法，其意义在于控制弥散颗粒的物质、尺寸、数量密度和分布。该工艺适用于具有超细晶粒和精细分散的热稳定颗粒的VA族金属钒。结果表明，所研制的V-（1.6-2.6）%Y合金的晶粒尺寸在170 - 340 nm之间，颗粒（Y_2O_3和YN）尺寸在13 - 25 nm之间，具有以下特点：（1）在1573 K真空加热1h后，显微组织稳定; (2)钒基体中的溶质氧和氮含量非常低，这是钒环境脆化的原因。(3)该合金在低温下表现出良好的拉伸强度和伸长率;与V-4Cr-4 Ti（Nifs-Heat-1）合金相比，强度高约1.5倍，伸长率高约70%。(4)所开发的合金在563 K至0.25dpa和873 K至0.60dpa下表现出良好的耐中子辐照性能。这些制造工艺和所述特征适用于其它VA族金属，例如钽。
In order to improve the resistance to serious radiation embrittlement in refractory metals, a process for microstructural control is presented, with significance of controlling the substance, size, number density and distribution of dispersed particles. The process is applied to vanadium, a metal of group VA, with ultra-fine grains and finely dispersed, thermally stable particles. It is shown that the developed V–(1.6–2.6)%Y alloys have grain sizes between 170 and 340nm and particle (Y2O3and YN) sizes between 13 and 25nm and exhibit the following noted features: (1) The microstructure is stable against vacuum heating at 1573K for 1h. (2) The vanadium matrix is very low in solute oxygen and nitrogen, which are responsible for environmental embrittlement of vanadium. (3) The alloys exhibit good tensile strength and elongation at low temperatures; approximately 1.5 times more strength and about 70% of the elongation compared with a V–4Cr–4Ti (Nifs-Heat-1) alloy. (4) The developed alloys show good resistance to neutron irradiation at 563K to 0.25dpa and 873K to 0.60dpa. These fabrication processes and noted features are applicable to other group VA metals such as tantalum.