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superdislocation DISSOCIATION IN INTERMETALLIC COMPOUND Ni_3Al

中国有色金属学会会刊：英文版 1999年第S1期9卷 95-99页

作者： Mao Wen Present addresss: Institute of Materials Science, South China University of Technology, Guangzhou 510641, P.R. China and Dongliang Lin (T. L. Lin) Open Laboratory for High Temperature Materials and Tests, School of Materials Science and Enginee

The dissociation of a [1-01] superdislocation in Ni 3Al was studied by computer simulation techniques using the embedded atom method (EAM). Three types of dissociation were obtained, depending on the initial position of elastic centers of the superdislocation. One is the stable planar dissociation that the superdislocation dissociates on only one {111} plane into a pair of 1/2[1-01] superpartials separated by antiphase boundary (APB). Another stable dissociation is that it occurs on two adjacent {111} planes joined by an intersecting {111} or (010) plane. The metastable one is that the dissociation occurs in T shape: the superdislocation dissociates on two intersecting {111} planes into three partials: one 1/2[1-01] partial and two widely separated 1/6〈112〉 Shockley partials with a complex stacking fault (CSF) in between.

关键词： Ni 3Al compound superdislocation dissociation stacking faults

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DISLOCATION PINNING IN HIGH TEMPERATURE DEFORMED Ni_3(Al,Ti) SINGLE CRYSTALS CONTAINING DISORDERED γ PRECIPITATES

引用

Acta Metallurgica Sinica(English Letters) 2006年第3期19卷 157-164页

作者： W.H. Tian M. Nemoto Department of Materials Physics and Ghemistry University of Science and Technology Beijing Beijing 100083 China Sasebo National Gollege of Technology Okishin 1-1 Sasebo 857-1193 Japan

A transmission electron microscopy （TEM） investigation has been performed on the dislocation pinning in Lie-ordered Ni3（Al, Ti） containing disordered γ *** 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.

关键词： superdislocation precipitate attractive interaction cross slip Ll2-ordered Ni3Al

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