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Electron Microscopy Observations on the Role of Twinning in the Evolution of Microstructures

Published online by Cambridge University Press:  09 January 2003

U. Dahmen ,
C.J.D. Hetherington ,
V. Radmilovic ,
E. Johnson ,
S.Q. Xiao  and
C.P. Luo
U. Dahmen
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, 1, Cyclotron Rd., Berkeley, CA 94720, USA
C.J.D. Hetherington
Affiliation:
Department of Materials, Oxford University, Parks Rd., Oxford OX1 3PH, UK
V. Radmilovic
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, 1, Cyclotron Rd., Berkeley, CA 94720, USA
E. Johnson
Affiliation:
Niels Bohr Institute for Astronomy, Physics and Geophysics, Ørsted Laboratory, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
S.Q. Xiao
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, 1, Cyclotron Rd., Berkeley, CA 94720, USA
C.P. Luo
Affiliation:
Department of Mechanical Engineering, South-China University of Technology, Guangzhou, P.R. China, 510641
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Abstract

Twinning plays an important role in phase transformations and can have significant effects on microstructural evolution. Different roles of twinning in the development of microstructures during precipitation and phase transformations are reviewed and illustrated with examples from investigations by high-resolution electron microscopy, including the effect of multiple twinning on the development of Ge precipitates in Al-Ge and Ag-Ge alloys, the twin dissociation of grain boundaries in Au, the formation of hexagonal Si at twin intersections and the effect of twin boundaries on the equilibrium shape of Pb inclusions in Al.

Keywords

multiple twinninghigh resolution electron microscopyprecipitationgrain boundaryaluminum alloyshexagonal silicon
Type
A SYMPOSIUM IN HONOR OF PROFESSOR GARETH THOMAS
Information
Microscopy and Microanalysis , Volume 8 , Issue 4 , August 2002 , pp. 247 - 256
Copyright
2002 Microscopy Society of America

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