Using concentration gradients to examine the effects of Al, Ga and Sn additions on the low-activation VCrMnFe system
Using concentration gradients to examine the effects of Al, Ga and Sn additions on the low-activation VCrMnFe system
复制标题
使用浓度梯度研究 Al、Ga 和 Sn 添加物对低活化 VCrMnFe 体系的影响
DOI:
10.1088/2515-7655/acc3c1
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发表时间:
2023
期刊:
影响因子:
9
通讯作者:
Carruthers A
中科院分区:
文献类型:
--
作者:
Carruthers A
A critical design criterion for future fusion reactor components is low activation. The equiatomic multi-principal element alloy VCrMnFe is comprised solely of low activation elements and forms a single-phase solid solution at temperatures over 1000 C. However, at lower temperatures it forms detrimental sigma phase. In this work, compositional gradients of Ga, Sn or Al were induced in VCrMnFe using only a furnace to investigate their effect on intermetallic formation. By examining how the microstructure changed across a region with varying composition, phase stability limits could be assessed. For example, all three elements were found to prevent sigma phase from forming within the alloy when they were present at relatively low concentrations (2–5 at%). Al was found to be the most promising addition (in terms of not causing embrittlement), and the approach used enabled the characterisation of the VCrMnFe–Al pseudo binary phase diagram up to 50 at% Al after heat treatment of 800 C/240 h followed by ageing at 600 C/240 h, with numerous ordered phases found using electron diffraction. The level of Al addition required to suppress the sigma phase has been identified more precisely, which will be useful for future alloy development work.
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