Cu-Al-Ni microstructure in the phenomenological theory of martensite with lattice invariant deformation

Abstract
Geometrical analysis of interfaces in a Cu-Al-Ni alloy is performed on the basis of the phenomenological theory of martensite. The austenite-martensite interfaces in the foils of the Cu-Al-Ni alloy are faceted. In order to assess possible facet planes, lattice invariant deformation in the form of a simple shear is included into the phenomenological theory. The experimentally observed normals to the facet planes lie in the predicted regions. Experimentally observed lines in the intervariant interfaces are interpreted as slip steps. The directions of these lines agree with theoretical predictions.

Note to the reader:
On page 03010-p2 several mistakes have been corrected on October 19, 2009.