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Combination and Interface Structure of 9R Martensite Plate Variants in Ti50.0Pd43.0Fe7.0 Shape Memory Alloy
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Sei-ichiro Ii1), Minoru Nishida1), Toru Hara2) and Kazuyuki Enami3)
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1) Department of Material Science and Engineering, Graduate School of Science and Technology, Kumamoto University
2) National Institute for Material Science
3) Department of Mechanical and System Engineering, Ryukoku University
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The combination of 9R martensite plate variants in Ti50.0Pd43.0Fe7.0 shape memory alloy has been investigated by conventional transmission electron microscopy (CTEM). Three fundamental combinations of plate variants are identified in the plate group. These are designated as A:B, A:C and A:D types, which correspond to ⟨\bar591⟩9R Type II, {11\bar4}9R Type I and {105}9R compound twins, respectively. They show the same morphological characteristics of 9R and 18R martensite in Cu-base shape memory alloys, i.e., wedge, spear and fork (or kink) types. The Type II and compound twins are new findings. Irrational nature of the A:B interface is also studied in the edge-on state by high resolution electron microscopy (HREM). The boundary is gradually and randomly curved with strain contrast.
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Keyword: titanium-palladium-iron shape memory alloy, martensitic transformation, 2H martensite, 9R martensite, transformation twin, variants accommodate twin, transmission electron microscopy (TEM), high resolution electron microscopy (HREM)
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Received: November 22, 2001
Accepted: February 08, 2002 ,
Published online: September 06, 2005 |
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Copyright (c) 2005 The Japan Institute of Metals |
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