Abstract
Transmission electron microscopy (TEM) examinations of Ag-modified Al 3Ti with an L1 2-ordered structure have revealed the precipitation of L1 0–TiAl upon aging after quenching from higher temperatures. TEM observations revealed that plate-like L1 0–TiAl precipitates lie on {001} planes of (Al,Ag) 3Ti matrix in the short aging period and the habit plane changed from {001} to {hhl} after a long period aging or higher temperature aging and finally to {225} of the matrix lattice. A quantitative X-ray microanalysis for determining the chemical compositions of precipitate and matrix has been done by using an analytical electron microscope. The L1 2 phase field in the Ti–Al–Ag system is severely skewed with respect to the temperature axis and is restricted into a much smaller field at lower temperatures. The coherency stresses across the precipitate/matrix interface is considered to be the main factor controlling the precipitate morphology.
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