Experimental verification of a micromechanical model for polycrystalline shape memory alloys in dependence of martensite orientation distributions

Hackl, K.; Heinen, R.; Schmahl, Wolfgang W. and Hasan, M. (2008): Experimental verification of a micromechanical model for polycrystalline shape memory alloys in dependence of martensite orientation distributions. In: Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, Vol. 481, No. SI: pp. 347-350

Abstract

We make use of a micromechanical model for polycrystalline shape memoryalloys, whose main focus is the orientation distribution of themartensitic low symmetry variant. By energy minimization, the internalreorientation of martensite can be predicted. Hysteresis effects areincluded via the hypothesis that changes in the orientation distributionare connected to energy dissipation. From these considerations, weobtain evolution equations for the orientation distribution in terms ofthe thermomechanical driving forces. Comparing our model to results fromsynchrotron diffraction experiments, good agreement is found betweenexperimentally observed and analytically predicted orientations ofaustenite and stress-induced martensite.

• Item Type: Journal article
• Faculties: Geosciences > Department of Earth and Environmental Sciences > Crystallography and Materials Science
• Subjects: 500 Science > 550 Earth sciences and geology
• Language: English