Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7880198 | Acta Materialia | 2015 | 12 Pages |
Abstract
Coherency and orientation relationship of nano-sized Y2Ti2O7 particles with an austenitic matrix of oxide dispersion strengthened steel was investigated using selected area diffraction contrast techniques and high resolution transmission electron microscopy. It was revealed that over 95% of the Y2Ti2O7 particles (3-10Â nm in diameter) are semi-coherent with the austenitic matrix. Perfectly matched planes, which produce no-contrast lines under proper two-beam conditions in transmission electron microscopy (TEM), were obtained across the oxide/matrix interface between parallel planes of 2â¾20Y2Ti2O7//200Matrix, and 3â¾3â¾1Y2Ti2O7//02â¾2Matrix. A single no-contrast line and multiple no-contrast lines under different active g-vectors were observed and discussed. The lattice distortion in the matrix around the Y2Ti2O7 particles was determined using the diffraction contrast method under TEM and through X-ray diffraction analyses, which revealed good agreement. A decrease in the inter-planar spacing of up to 7.5% was detected in 02â¾2Matrix planes owing to the misfit strain at the oxide/matrix interface.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Xiaodong Mao, Kyu Hwan Oh, Suk Hoon Kang, Tae Kyu Kim, Jinsung Jang,