In order to clarify the applicability of higher order Laue zone (HOLZ) patterns in convergent beam electron diffraction to the determinations of local lattice distortions in two-phase alloys, we discussed experimental conditions affecting the accuracy, and observed HOLZ patterns of a Cu-20at%AI alloy, in which small particles of a2-phase with one dimensional long period superstructure are precipitated in the matrix of fee α-phase. It was shown that the accuracy is affected by specimen thickness as well as beam direction, and that lattice parameters along the  and  axes can be determined from a  HOLZ pattern with an error less than one part in a thousand. The  HOLZ patterns were obtained both from small regions in α-matrix and a2-particles. Slight changes in lattice parameters were detected as a function of position with a high spatial resolution.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry