Dr. V. Prieb
Heterogeneous and homogeneous stress-induced martensitic transformation
from different austenitic state of heat treated Cu-Zn-Al single-crystals
martensitic transformations with a single-interface and with
multiple-interfaces are investigated on single-crystals of the
non-stoichiometric Cu-16.0 at% Zn-15.2 at% Al shape memory alloy.
Two different kinetics are caused by the austenite start-structure that was investigated by
transmission electron microscopy after different heat treatments. Thermodynamic
parameters of the stress-free thermal-induced transformation of the same heat
treated single-crystal alloy were also determined by calorimetry.
The heterogeneous stress-induced martensitic transformation is energetically more favourable from
the homogeneous austenite and the homogeneous stress-induced transformation,
from a heterogeneous austenite structure which is interpreted as a (B2+DO3)-mixture.
This situation is likely the homogeneous (Luder's line) and heterogeneous (multiple slipping) plastic
deformation. The single-interface velocity, the martensitic strain inside of
the martensitic single-domain, and the increase/decrease of the sample
temperature due to adiabatic single interface propagation are measured.
More about this in my monograph, published in November 2020:
"The concept of dual-energetic martensite (CODEM) for shape memory phenomena", PDF-file