Positron annihilation characterization of nanostructured ferritic alloys
Positron annihilation characterization of nanostructured ferritic alloys
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DOI：
10.1016/j.msea.2009.04.040
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发表时间：
2009-08-25
期刊：
影响因子：
6.4
通讯作者：
Hasegawa, M.
中科院分区：
文献类型：
--
作者：
Alinger, M. J.;Glade, S. C.;Hasegawa, M.
通过机械合金化Fe-14 Cr-3 W-0.4Ti和0.25Y（2）O（3）（wt%）粉末，然后在850、1000和1150 ℃下进行热等静压固结来制备纳米结构铁素体合金（NFA）。正电子湮没寿命和轨道动量谱测量与小角中子散射，透射电子显微镜和原子探针断层扫描观测定性一致，表明高达50%的湮灭发生在高密度的Y-Ti-O富集纳米尺度特征（NF）。一些湮灭也可能发生在小腔中。在不含钇的对照合金中，不含NF，正电子主要在Fe-Cr基质和位错等特征处湮灭，而小部分在大空腔或Ar气泡中湮灭。(C)2009 Elsevier B. V.保留所有权利。
Nanostructured ferritic alloys (NFAs) were produced by mechanically alloying Fe-14Cr-3W-0.4Ti and 0.25Y(2)O(3) (wt%) powders followed by hot isostatic pressing consolidation at 850, 1000 and 1150 degrees C. Positron annihilation lifetime and orbital momentum spectroscopy measurements are in qualitative agreement with small angle neutron scattering, transmission electron microscopy and atom probe tomography observations, indicating that up to 50% of the annihilations occur at high densities of Y-Ti-O enriched nm-scale features (NFs). Some annihilations may also occur in small cavities. In Y-free control alloys, that do not contain NFs, positrons primarily annihilate in the Fe-Cr matrix and at features such as dislocations, while a small fraction annihilate in large cavities or Ar bubbles. (C) 2009 Elsevier B.V. All rights reserved.