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

被引：38
|
作者：
Khalil-Allafi, Jafar
Schmahl, Wolfgang W.
Toebbens, D. M.
机构：
[1] Sahand Univ Technol, Fac Mat Engn, Tabriz, Iran
[2] Ruhr Univ Bochum, Inst Geol Mineral & Geophys, D-44780 Bochum, Germany
[3] Ludwig Maximilians Univ Munchen, Dept Earth & Environm Sci Mat Res, Munich, Germany
[4] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany
来源：
ACTA MATERIALIA | 2006年 / 54卷 / 12期
关键词：
Ni-rich NiTi shape memory alloys; R-phase; crystal structure; neutron diffraction; Rietveld method (GSAS);
D O I：
10.1016/j.actamat.2006.02.040
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The crystal structure parameters of the R-phase in a binary Ni50Ti49.2., shape memory alloy were redetermined using it device minimizing texture effects on neutron diffraction intensities. A sphere of 9 mm diameter Cut from a alloy which shows the R-phase state at room temperature was suspended oil an air cushion and kept in chaotic rotation motion while neutron diffractograms were obtained. Several models with different space group symmetries were tested in Rietveld refinements using the GSAS software. Our results clearly favour P (3) over bar symmetry, confirming the results of recent electron diffraction and X-ray diffraction Studies. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：3171 / 3175
页数：5
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