Characterisation of atomic-scale defects in ODS ferritic alloys by positron annihilation
Characterisation of atomic-scale defects in ODS ferritic alloys by positron annihilation
复制标题
通过正电子湮灭表征 ODS 铁素体合金中的原子级缺陷
DOI：
10.1080/14786435.2018.1563309
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发表时间：
2019
影响因子：
1.6
通讯作者：
D. A. Perminov
中科院分区：
文献类型：
--
作者：
A. P. Druzhkov;D. A. Perminov
研究了美国(14YWT)、中国(K5)和俄罗斯(ODSEP-450)生产的不同类型的ODS合金中的空位型缺陷及其局域化学环境。采用了正电子湮没谱方法中的角相关湮没辐射法(ACAR)。结果表明，除14YWT外，所有合金中，正电子陷阱的主要类型是空位类缺陷，定域在基质中或与位错和/或非共格粒子的界面有关。在含有高密度Y-Ti-O纳米团簇的14YWT合金中，正电子限制并湮没在纳米团簇中的O-空位对或复合体上。钛、Y原子的湮没位置和附近电子密度的增加也证明了这一点。由ACAR方法得到的这些结果表明，空位在ODS14YWT合金中纳米团簇的形成中起着至关重要的作用，正如第一性原理计算理论所预测的那样。
ABSTRACT The vacancy-type defects and their local chemical environment in different ODS alloys produced in the USA (14YWT), China (K5) and Russia (ODS EP-450) are studied. The Angular Correlation of Annihilation Radiation (ACAR), which is one of the positron annihilation spectroscopy method, was used. It was shown that in all alloys, except 14YWT, the dominant type of positron traps are vacancy-like defects, localised in matrix or associated with dislocations and/or interfaces of the incoherent particles. In the case of 14YWT alloy, which contains Y–Ti–O nanoclusters of a high density, the positrons confine and annihilate at O-vacancy pairs or complexes within nanoclusters. It is testified by enhanced electron density in annihilation sites and neighbourhood of Ti and Y atoms. These results, obtained by the ACAR method, indicate that the vacancies play an essential role in the formation of nanoclusters in ODS 14YWT alloy as it was theoretical predicted by first-principle calculations.
影响因子：
3.7
作者：
Nagai, Y;Takadate, K;Hasegawa, M
通讯作者：
Hasegawa, M
DOI：
10.1016/j.msea.2009.04.040
发表时间：
2009-08-25
影响因子：
6.4
作者：
Alinger, M. J.;Glade, S. C.;Hasegawa, M.
通讯作者：
Hasegawa, M.