Local Strain Analysis with LACBED and Weak-Beam Imaging
- Prof. T. W. Clyne and
- F. Simancik
Published Online: 21 DEC 2005
Copyright © 2000 Wiley-VCH Verlag GmbH, Weinheim
Metal Matrix Composites and Metallic Foams, Volume 5
How to Cite
Heinrich, H., Vananti, A. and Kostorz, G. (2000) Local Strain Analysis with LACBED and Weak-Beam Imaging, in Metal Matrix Composites and Metallic Foams, Volume 5 (eds T. W. Clyne and F. Simancik), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606203.ch19
Department of Materials Science and Metallurgy, Cambridge University, Pembroke Street, Cambridge CB2 3QZ, U.K.
- Published Online: 21 DEC 2005
- Published Print: 20 APR 2000
Print ISBN: 9783527301263
Online ISBN: 9783527606207
- local strain analysis;
- weak-beam imaging
Mechanical twinning is an important deformation mechanism of the γ phase of lamellar two-phase TiAl/Ti3Al. The tips of deformation twins reaching γ/α2 interfaces induce high stresses in the α2 phase. With weak-beam imaging, a component of the resulting strain field can be evaluated quantitatively. If the α2 lamellae exceed a thickness of about 200 nm, they effectively shield the stress fields induced by the deformation twins in samples with lamellae oriented perpendicular to the deformation axis. In large-angle convergent beam electron diffraction (LACBED) the higher-order Laue-zone (HOLZ) lines are curved and shifted if lattice distortions and lattice parameter changes occur. Many beam dynamical diffraction theory is used to simulate HOLZ line patterns of distorted crystals. The stress fields used in these simulations are adjusted to experimental LACBED images of short fiber reinforced Al-based metal matrix composites.