DISLOCATION PINNING IN HIGH TEMPERATURE DEFORMED Ni3(Al,Ti) SINGLE CRYSTALS CONTAINING DISORDERED γ PRECIPITATES
来源期刊：Acta Metallurgica Sinica2006年第3期
论文作者：W.H. Tian M. Nemoto
Key words：superdislocation; precipitate; attractive interaction; cross slip; LI2-ordered Ni3Al;
Abstract: A transmission electron microscopy (TEM) investigation has been performed on the dislocation pinning in LI2-ordered Ni3(Al, Ti) containing disordered γ precipitates. The morphology of deformation induced dislocations in the γ' base alloys containing fine dispersion of disordered γ was investigated by means of weak-beam electron microscopy. The superdislocations are strongly attracted to the disordered particles and dissociate on the (111) plane in the γ particles, while they dissociate on the (010) plane in the γ' matrix. The disordered γ precipitates play an important role as a pinning point during the cross-slip of superdislocations from (111) to (010) planes in the γ'matrix and restrain the cross-slip of superdislocations. The interaction of superdislocations with disordered particles causes the formation of superkinks, jogs and closed loops.
W.H. Tian1，M. Nemoto2
(1.Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China;
2.Sasebo National College of Technology, Okishin 1-1, Sasebo 857-1193, Japan)
Abstract:A transmission electron microscopy (TEM) investigation has been performed on the dislocation pinning in LI2-ordered Ni3(Al, Ti) containing disordered γ precipitates. The morphology of deformation induced dislocations in the γ'' base alloys containing fine dispersion of disordered γ was investigated by means of weak-beam electron microscopy. The superdislocations are strongly attracted to the disordered particles and dissociate on the (111) plane in the γ particles, while they dissociate on the (010) plane in the γ'' matrix. The disordered γ precipitates play an important role as a pinning point during the cross-slip of superdislocations from (111) to (010) planes in the γ''matrix and restrain the cross-slip of superdislocations. The interaction of superdislocations with disordered particles causes the formation of superkinks, jogs and closed loops.
Key words:superdislocation; precipitate; attractive interaction; cross slip; LI2-ordered Ni3Al;
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