Premartensitic State of Ti-Pd-Fe Shape Memory Alloys Studied by Electrical Resistivity, Magnetic Susceptibility and Specific Heat Measurements
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- Todai Mitsuharu
- Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
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- Fukuda Takashi
- Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
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- Kakeshita Tomoyuki
- Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
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Abstract
Transformation behavior in Ti-(50-x)Pd-xFe shape memory alloys has been investigated by electrical resistivity, magnetic susceptibility and specific heat measurements. The alloys with x=14, 16 and 18 exhibit an obvious first order martensitic transformation, but the alloys with x=19, 20 and 22 exhibit no first order transformation down to 4.2 K. However, the latter alloys show a negative temperature coefficient in electrical resistivity below a temperature Tmin, which decreases with increasing x. The increase in resistivity with decreasing temperature is associated with a decrease in magnetic susceptibility. Also, specific heat measurements at cryogenic temperatures have revealed that the electronic specific heat coefficient of the latter alloys (x=19, 20 and 22) is significantly larger than that of the former alloys (x=14, 16 and 18). These results suggest that the so-called precursor phenomena observed in Ti-Pd based shape memory alloys are caused by the instability of electronic structure of the B2-phase, as in the Ti-Ni based alloys previously studied by our group.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 51 (5), 906-910, 2010
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390001204250614400
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- NII Article ID
- 10026267502
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- NII Book ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 10660657
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed