کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1447791 | 988656 | 2010 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: α- to γ-Al2O3 martensitic transformation induced by pulsed laser irradiation α- to γ-Al2O3 martensitic transformation induced by pulsed laser irradiation](/preview/png/1447791.png)
A martensitic transformation from the α to the γ phase of aluminum oxide was observed by transmission electron microscopy (TEM) upon rapid heating induced by pulsed laser irradiation. Two variants possessing a twin relationship were found in the product. High-resolution TEM reveals that the transformation is achieved via the glide of quarter partial dislocations on every other basal plane of α-Al2O3. The high thermal stress caused by pulsed laser irradiation is believed to be the main driving force of the phase transformation. This martensitic transformation is associated with a positive volume change and substantial shear strain. The overall shear strain could be minimized by the self-accommodating variants. These characteristics suggest potential application of the martensitic transformation for transformation toughening in ceramic materials.
Journal: Acta Materialia - Volume 58, Issue 11, June 2010, Pages 3867–3876