Comment on “A TEM study of martensite habit planes and orientation relationships in Cu–Al–Ni shape memory alloys using a fast Δ g-based method”

Abstract

A recent study of Cu–Al–Ni alloys has demonstrated the convenience of using parallel Δ g ’s for measuring the irrational habit planes of martensite, but the paper lacks a theoretical basis. A key point that is missing is the link between the parallel Δ g ’s and the lattice-invariant shear direction in the phenomenological theory of martensitic crystallography (PTMC). After clarifying the equivalency between the PTMC and the parallel Δ g model, this work presents calculated results based on the PTMC and the Δ g model, showing consistency with the experimental results.