Study on the dissolution of ß-precipitates in the Zr-1Nb alloy under the influence of Ne ion irradiation.
Study on the dissolution of ß-precipitates in the Zr-1Nb alloy under the influence of Ne ion irradiation.
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Ne离子辐照影响下Zr-1Nb合金中α-析出相溶解的研究
DOI：
10.1093/jmicro/dfab017
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Goel L
中科院分区：
文献类型：
--
作者：
Goel L
用透射电镜研究了能量为250 keV的Ne离子辐照Zr-1 Nb合金中β相的稳定性与辐照剂量的关系。在573 K下进行了高达136 dpa的辐照。显微结构研究表明，高达1.38 dpa，沉淀物显示出尺寸的增加，并且对于>38 dpa的辐照剂量，注意到沉淀物的尺寸减小。照射后的试样的能量色散光谱显示，整个基体中的Nb浓度为0.8- 1.5%。三维原子探针断层扫描也进行了辐照标本寻找任何纳米团簇的存在。然而，在样品中未观察到Nb聚集。有人提出，沉淀物的溶解可能是促进由辐照引起的Nb在Zr中的溶解度极限的增加。溶解度极限可通过引入由辐照产生的缺陷和通过β相的不稳定而增加。这可能导致Nb原子通过辐射增强扩散反向扩散到基体，以降低由缺陷产生的应变，导致沉淀物溶解。
The stability of β-precipitates in the Zr–1Nb alloy has been studied under Ne ion irradiation of energy 250 keV byinsitutransmission electron microscope as a function of irradiation dose. The irradiation was carried out up to ∼136 dpa at 573 K. Microstructural investigations have shown that up to ∼38 dpa, precipitates showed an increase in size, and for irradiation doses >38 dpa, the size of the precipitates was noticed to reduce. Post-irradiation energy-dispersive spectrometry of the specimens revealed the Nb concentration throughout the matrix to be ∼0.8–1.5%. Three-dimensional atom probe tomography was also carried out for irradiated specimens to look for the presence of any nanoclusters. However, Nb clustering was not observed in the specimens. It is proposed that the dissolution of the precipitates may be facilitated by an increase in the solubility limit of Nb in Zr caused by irradiation. The solubility limit may increase by the introduction of defects generated by irradiation and by the destabilization of the β-phase. This may result in back-diffusion of Nb atoms to the matrix by radiation-enhanced diffusion to lower the strain produced by the defects, resulting in the dissolution of the precipitates.