RETRACTED: Precipitation behavior of Al-Ti-Ag alloy system (Retracted article. See vol. 21, pg. 614, 2015)

被引：4
|
作者：
Oh, Chang-Sup [2 ]
Han, Chang-Suk [1 ]
机构：
[1] Hoseo Univ, Dept Def Sci & Technol, Asan 336795, South Korea
[2] Korea Inst Sci & Technol Informat, Reseat Program, Taejon 305806, South Korea
来源：
METALS AND MATERIALS INTERNATIONAL | 2012年 / 18卷 / 03期
关键词：
alloys; aging; mechanical properties; transmission electron microscopy (TEM); precipitates; INTERMETALLICS; TEMPERATURE; PHASE; DEFORMATION; FRACTURE; CRYSTAL; AL3TI; CR;
D O I：
10.1007/s12540-012-3003-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Transmission electron microscopy (TEM) examinations of Al3Ti with an L1(2)-ordered structure have revealed the precipitation of D0(23)-Al11Ti5 and L1(0)-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 L1(2)-Al3Ti is supersaturated with DO22-Al3Ti, DO23-Al11Ti5 with a multidomain structure is formed during aging. On the other hand, plate-like L1(0)-TiAl precipitates lie on the {001} planes of (Al,Ag)(3)Ti 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. The Ll(2) 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.
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页码：397 / 404
页数：8
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