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Rietveld Analyses on Hydrogenated TiNi Shape Memory Alloy and Multiple-Stage Transformation
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Takuya Ohba1), Fusanobu Yanagita1), Masahiro Mitsuka1), Toru Hara2) and Kenichi Kato3)
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1) Department of Materials Science, Shimane University
2) National Institute for Materials Science
3) Japan Synchrotron Radiation Research Institute (JASRI)
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Hydrogenated TiNi alloy were investigated by X-ray diffraction and the Rietveld refinements from the view of transformation behavior. Small expansion of lattice constants indicated that hydrogen atoms located at interstitial sites in parent and martensite phases were small amount. The refinements also indicated that the amount of hydride TiNi(H) was approximately 0.1%, which was small. These refinements and optical microscopic observations indicated most of hydrogen atoms were located around grain boundaries or martensite variant boundaries. DSC measurements showed that hydrogenated TiNi displayed multiple-stage transformation behavior and thus hydrogen atoms around grain boundaries may cause mutiple-stage behavior of the transformation.
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Keyword: TiNi alloy, TiNi hydride, Rietveld method, multiple-stage transformation
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Received: November 20, 2001
Accepted: January 23, 2002 ,
Published online: September 06, 2005 |
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Copyright (c) 2005 The Japan Institute of Metals |
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