Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1608044 | Journal of Alloys and Compounds | 2015 | 4 Pages |
Abstract
Oxidation induced phase transformation from γⲠto γ phase can severely degrade creep properties of superalloys and has been studied by in-situ environmental transmission electron microscopy, energy dispersive spectrometer and electron energy loss spectroscopy in detail. The in-situ observation showed that, during oxidization, the ordered γⲠphase (L12) gradually transformed to disordered γ phase (face-centered cubic (fcc)) with the appearance of oxidation product consisted of γ-Al2O3 crystallites with a strong crystallographic texture. This directly proves that γâ²-γ phase transformation are induced by aluminum oxidation with aluminum depleted in γⲠphase. Furthermore, the oxygen was demonstrated to diffuse preferentially through γâ²-γ phase interface which is different from previously thought (γ matrix).
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Qingqing Ding, Zhenju Shen, Sisi Xiang, He Tian, Jixue Li, Ze Zhang,