Place: EUROMAT 2011 - European Congress on Advanced Materials and Processes, Montpellier, France
Oguz Salman, CNRS - Centre national de la recherche scientifique, Paris, France
Alphonse Finel, Laboratoire d'etude des microstructures ONERA, Châtillon, France
We present a theoretical study of the microstructure formation in NiTiCu shape memory alloy during the cubic (B2) to orthorhombic (B19) martensitic phase transformation. We provide a simple Landau type free energy functional for cubic-to-orthorhombic phase transformation which is capable to reproduce elastic properties of the NiTiCu SMA in a temperature range wider than (Af – Mf) around the transformation temperature. This allows to effectively study microstructure formation during the temperature or stress induced martensitic phase transformation in NiTiCu. The proposed functional is used for a three dimensional microstructure formation simulation using the Lagrangian dynamics modeling. A detailed analysis of the obtained microstructure is provided, which explains some of the experimentally observed phenomena.