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In situ structural and texture analyses of monoclinic phase for polycrystalline Ni-rich Ti49.86Ni50.14 alloy from neutron diffraction data

Published online by Cambridge University Press:  29 February 2012

Husin Sitepu
Husin Sitepu
Affiliation:
Crystallography Laboratory, Virginia Tech, Blacksburg, Virginia 24061, USA and Department of Physics, College of Science, Sultan Qaboos University, P.O. Box 36, Postal Code 123, Muscat, Oman
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Abstract

Phase transformation temperatures of a polycrystalline Ni-rich Ti49.86Ni50.14 shape memory alloy were investigated using a differential scanning calorimeter. In situ structural and texture analyses of the monoclinic Ti49.86Ni50.14 were investigated using neutron powder diffractometer technique. Differential scanning calorimeter results showed that this Ni-rich alloy has a one-step cubic to monoclinic martensitic phase transformation on cooling and a one-step monoclinic to cubic transformation on heating. In situ high-resolution neutron powder diffraction data of the monoclinic phase from low temperatures to room temperature on heating are consistent with the differential scanning calorimeter’s heating results. In addition, the refined monoclinic crystal structure parameters for all neutron diffraction data sets agree satisfactorily with single-crystal X-ray diffraction results. The multiple-data-set capabilities of the GSAS Rietveld refinement program, with a generalized spherical-harmonics description was used successfully to extract the texture description directly from a simultaneous refinement using 52 time-of-flight monoclinic neutron diffraction patterns, taken from a polycrystalline sample held in 13 orientations inside the diffractometer.

Keywords

neutron powder diffractiontexturemartensitic phase transformationTi49.86Ni50.14 shape memory alloydifferential scanning calorimeter

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Type
Technical Articles
Information
Powder Diffraction , Volume 23 , Issue 1 , March 2008, pp. 35 - 40
Copyright
Copyright © Cambridge University Press 2008

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