期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.11.176
关键词
NiTiFe shape memory alloy; phase transformation; neutron diffraction; Rietveld refinement; R-phase
The Spectrometer for Materials Research at Temperature and Stress (SMARTS) at Los Alamos National Laboratory was used to acquire neutron diffraction spectra in situ during mechanical loading at 216 and 237 K. The experiments were performed with the objective of following the texture, strain and phase fraction evolution in the trigonal R-phase in a Ni46.8Ti50Fe3.2 shape memory alloy. A methodology to quantify the textures, strains and phase fractions using the General Structure Analysis System (GSAS) for Rietveld refinement of neutron diffraction spectra, is implemented and described. Emphasis is placed on evaluating the choice of P3 and P (3) over bar space groups for the R-phase in the refinements and the impact of this choice on the quantitative analyses of spectra. (C) 2007 Elsevier B.V. All rights reserved.
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