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Microstructure of quenched Ni-rich Ni-Ti shape memory alloys
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| Abstract |
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| Microstructural investigations with transmission electron microscopy were carried out on quenched Ni-Ti alloys with 52 and 54.5 at% Ni. For the Ni52Ti48 specimen long time exposed diffraction patterns of a single grain show besides the expected reflections of the B2-phase, two sets of extra reflections in different zones. The first type of spots is explained by lattice displacement waves, which are regarded as precursors of the martensitic Ni-Ti phases, B 19' and R-phase, respectively. The second set of reflection with more diffuse intensity than the other reflections is related to Ni4Ti3 precipitates in an early state of formation. For the Ni-richer Ni54.5Ti45.5 alloy only Ni4Ti3 precipitates in an early state of formation are found but no precursors of the B 19'- and R-phase. | |
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English
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| Source (journal) |
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Journal de physique: 4. - Les Ulis, 1991 - 2006 |
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| Source (book) |
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8th European Symposium on Martensitic Transformations (ESOMAT2000), SEP 04-08, 2000, COMO, ITALY |
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| Publication |
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Les ulis cedexa : E d p sciences, 2001
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| ISSN |
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1155-4339
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11:PR8(2001), p. 445-449
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| ISI |
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000173253800075
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