7 research outputs found
Microstructures and transformation behavior of CoNiGa ferromagnetic shape memory alloys
TEM observations
and transformation characteristics of Co2Ni, xGal, ferromagnetic shape memory alloys
will be presented. The dependence of the martensitic transformation start temperatures on the valance-electron
atom ratio is identical to that of NiMnGa alloys. Optical microstructures show typical self-accommodated
structures. The domain boundaries are straight indicating only elastic distortions in the product phase.
High-density striations are observed in the TEM bright field images of the martensite-phase. Selected area electron
diffraction patterns and TEM dark field images revealed that they are thin twin plates. Tweed or striated contrast is
observed in the TEM bright field images of the parent phase at temperatures about 70 K higher than the M,
temperature