Precipitation Behavior of Al-Ti-Ag Alloy System

저자

오*섭

게재저널

http://www.kim.or.kr/

키워드

alloys, aging, mechanical properties, transmission electron microscopy (TEM), precipitates

개요

Transmission electron microscopy (TEM) examinations of Al3Ti with an L12-ordered structure have revealed the precipitation of D023-Al11Ti5 and L10-TiAl upon aging after quenching from higher temperatures.

TEM observations revealed that fine uniform precipitation of Al2Ti occurs when the supersaturation is sufficiently high, and, a preferential precipitation at the antiphase boundaries can be observed in alloy with a low supersaturation. When L12-Al3Ti is supersaturated with DO22-Al3Ti, DO23-Al11Ti5 with a multidomain structure is formed during aging. On the other hand, plate-like L10-TiAl precipitates lie on the {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.

TheLl2 phase field in the Al-Ti-Ag system is severely skewed with respect to the temperature axis and is restricted into a much smaller field at lower temperatures. Appreciable hardening and overage softening during aging can be explained in terms of microstructural variations.

첨부파일

• 17. 오창섭_METALS AND MATERIALS INTERNATIONAL_Precipitation Behavior of Al-Ti-Ag Alloy System.pdf [9,299,440 byte]

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