Stability of nanometer-sized oxide clusters in mechanically-alloyed steel under ion-induced displacement cascade damage conditions
Stability of nanometer-sized oxide clusters in mechanically-alloyed steel under ion-induced displacement cascade damage conditions
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DOI：
10.1016/j.jnucmat.2006.09.011
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发表时间：
2007-02
影响因子：
3.1
通讯作者：
P. Pareige;Michael K. Miller;R. Stoller;D. Hoelzer;E. Cadel;B. Radiguet
中科院分区：
文献类型：
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作者：
P. Pareige;Michael K. Miller;R. Stoller;D. Hoelzer;E. Cadel;B. Radiguet
氧化物弥散强化铁素体钢由于其高强度和高温应用潜力而被考虑用于许多先进的核反应堆应用。由于这些性能归因于存在高密度的非常小的（纳米尺寸的）氧化物簇，有兴趣在检查这种簇的辐射稳定性。进行了一项新的实验，以检查在机械合金化，氧化物弥散强化铁素体钢命名为12YWT的氧化物纳米团簇的稳定性。预抛光试样进行离子辐照，并通过原子探针断层扫描检查所得的微观结构。在300°C下用150keV的Fe离子辐照到10.7dpa后，在铁素体基体中观察到高数量密度的直径为14nm的纳米团簇。纳米团簇富含钇、钛和氧，贫含钨和铬，并且具有接近于（Ti+Y）：O的化学计量。在未辐照的材料中观察到类似的簇群，表明超细氧化物纳米簇在所使用的离子辐照条件下在位移级联损伤下抗粗化和溶解。
Oxide dispersion strengthened ferritic steels are being considered for a number of advanced nuclear reactor applications because of their high strength and potential for high temperature application. Since these properties are attributed to the presence of a high density of very small (nanometer-sized) oxide clusters, there is interest in examining the radiation stability of such clusters. A novel experiment has been carried out to examine oxide nanocluster stability in a mechanically alloyed, oxide dispersion strengthened ferritic steel designated 12YWT. Pre-polished specimens were ion irradiated and the resulting microstructure was examined by atom probe tomography. After ion irradiation to ∼0.7dpa with 150keV Fe ions at 300°C, a high number density of ∼4nm-diameter nanoclusters was observed in the ferritic matrix. The nanoclusters are enriched in yttrium, titanium and oxygen, depleted in tungsten and chromium, and have a stoichiometry close to (Ti+Y):O. A similar cluster population was observed in the unirradiated materials, indicating that the ultrafine oxide nanoclusters are resistant to coarsening and dissolution under displacement cascade damage for the ion irradiation conditions used.