DISLOCATION PINNING IN HIGH TEMPERATURE DEFORMED Ni3(Al,Ti) SINGLE CRYSTALS CONTAINING DISORDERED γ PRECIPITATES

金属学报(英文版), 2006, 19(3): 157-164.

^1, , ^2,

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

基金项目: Foundation of the Ministry of Education, Science, Sports, and Culture of Japan(59971008) 国家自然科学基金(59971008)

DISLOCATION PINNING IN HIGH TEMPERATURE DEFORMED Ni3(Al,Ti) SINGLE CRYSTALS CONTAINING DISORDERED γ PRECIPITATES

W.H. Tian ^1, , M. Nemoto ^2,

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

Keywords： superdislocation

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.

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DISLOCATION PINNING IN HIGH TEMPERATURE DEFORMED Ni3(Al,Ti) SINGLE CRYSTALS CONTAINING DISORDERED γ PRECIPITATES

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