The characterisation of second phases in the Zr-Nb and Zr-Nb-Sn-Fe alloys: A critical review
The characterisation of second phases in the Zr-Nb and Zr-Nb-Sn-Fe alloys: A critical review
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DOI：
10.1016/j.jnucmat.2018.03.030
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发表时间：
2018-07
影响因子：
3.1
通讯作者：
A. Harte;M. Griffiths;M. Preuss
中科院分区：
文献类型：
--
作者：
A. Harte;M. Griffiths;M. Preuss
在合金的腐蚀、硬化和辐照生长过程中，合金中Fe环境的性质和演化对合金的性能是至关重要的。不幸的是，文献中关于这些系统中二次相的描述是模棱两可的。在β-Nb相中是否存在Fe一直是引起分歧的一个原因。在三元金属间化合物中，相同的成分被命名为：Zr(Nb，Fe)_2或(Zr，Nb)_3Fe。我们发现，虽然普遍报道的是Zr(Nb，Fe)2，但它并不总是合理的。立方相(Zr，Nb)2Fe较易辨认，但经低温处理后成分变化较大。我们论证了在不同的热处理制度下，需要相关的方法来评估相组成、结晶学和局部铁环境。辐照效应使我们能够获得有关相指定的线索，但由于初始相组成、辐照剂量率和温度的不同，在辐照下有不同的行为。
The nature and evolution of the Fe environment in Zr-Nb and Zr-Nb-Sn-Fe systems is essential to alloy performance during corrosion, hardening and irradiation-induced growth. Unfortunately, there is ambiguity in the literature regarding the characterisation of secondary phases in these systems. The presence, or not, of Fe in β-Nb phase has been a source of disagreement. In ternary ZrNbFe intermetallics, identical compositions have been designated as Zr(Nb,Fe)2or (Zr,Nb)3Fe. We show that while Zr(Nb,Fe)2is commonly reported, it is not always justified. The cubic phase (Zr,Nb)2Fe is easily identified, but its composition is more variable after low temperature heat treatments. We demonstrate the need for correlative approaches in the assessment of phase composition, crystallography and local Fe environment under different heat treatment regimes. Irradiation effects allow us to draw clues regarding phase designation, but there is diverse behaviour under irradiation due to initial phase composition, irradiation dose rate and temperature.