Space group and crystal structure of the R-phase in binary NiTi shape memory alloys

Khalil-Allafi, Jafar; Schmahl, Wolfgang W. and Többens, D. M. (2006): Space group and crystal structure of the R-phase in binary NiTi shape memory alloys. In: Acta Materialia, Vol. 54, No. 12: pp. 3171-3175

Abstract

The crystal structure parameters of the R-phase in a binary Ni50Ti49.2.,shape memory alloy were redetermined using it device minimizing textureeffects on neutron diffraction intensities. A sphere of 9 mm diameterCut from a alloy which shows the R-phase state at room temperature wassuspended oil an air cushion and kept in chaotic rotation motion whileneutron diffractograms were obtained. Several models with differentspace group symmetries were tested in Rietveld refinements using theGSAS software. Our results clearly favour P (3) over bar symmetry,confirming the results of recent electron diffraction and X-raydiffraction Studies.

• 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