High-resolution electron microscopy observation of a1/2(112) superdislocation in TiAl
作者:
B.J. Inkson,
C.J. Humphreys,
期刊:
Philosophical Magazine Letters
(Taylor Available online 1995)
卷期:
Volume 71,
issue 6
页码: 307-312
ISSN:0950-0839
年代: 1995
DOI:10.1080/09500839508241012
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Using high-resolution electron microscopy (HREM) the core structure of a1/2(112) superdislocation in TiAl is examined and observed to have dissociated into an extrinsic stacking fault and an intrinsic stacking fault, bounded by three1/6(112) partial dislocations. The core structure is non-coplanar, with the extrinsic stacking fault lying on two adjacent [111] planes bounded by a dissociated b =1/6(112) partial dislocation whose deiocalization can pin the dislocation core and may lead to the formation of ±1/6(112)dipoles.
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