The microstructure of various compounds of the TiNiAu alloy system is investigated by transmission electron microscopy in relation with changing lattice parameters improving the compatibility conditions between austenite and martensite expressed by the λ2 = 1 equation based on the Geometrically NonLinear Theory of Martensite (GNLTM). Although local differences in microstructure are observed, when increasing the gold content compound twins are replaced by Type I twins, while twinned lamellar structures are replaced by untwinned plates and self-accommodating structures when λ2 = 1 is approached, all confirming the predictions of the GNLTM.
Bibliographical noteFunding Information:
H.S. thanks the CONNEC “Connecting Europe and China through Interuniversity Exchange”, an Erasmus Mundus project, and the FWO research project G.0576.09N for supporting this work.
- Shape memory alloys (SMAs)
- Transmission electron microscopy (TEM)