2013 Fiscal Year Final Research Report
Development of ZrCo-based shape memory and superelastic alloys with a novel type martensite
| Project/Area Number |
24656417
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kumamoto University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 形状記憶・超弾性特性 / マルテンサイト変態 / 電子顕微鏡 / 構造・機能材料 / ジルコニウム / 長周期積層構造 |
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| Research Abstract |
The shape memory effect of about 40% and the superelastic strain of 2% were obtained in Zr-Co-X ( X= Ni, Pd, Pt) alloys by convenient bending and tensile tests. This is originated from the formation of martensite with characteristics of both thermal and non-thermal martensitic transformation. A novel long-period stacking-ordered (LPSO) structure of martensite with six layers orthorhombic (6O) structure in ZrCo-based alloys was studied by conventional transmission electron microscopy and high-angle annular dark-field scanning transmission electron microscopy. The lattice parameters of the LPSO structure were estimated to be a = 0.34 nm, b = 0.45 nm, and c = 1.53 nm. The space group of the LPSO structure was determined to be Immm on the basis of the extinction rule and symmetry.
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Research Products
(7 results)
