Multiaxial Shape Memory Effect and Superelasticity
نویسندگان
چکیده
منابع مشابه
Shape memory effect and superelasticity in a strain glass alloy.
The shape memory effect and superelasticity are usually found in alloys exhibiting spontaneous martensitic transformation. Thus it is hard to imagine that such interesting effects can appear in a system without a martensitic transformation. In this Letter we show shape memory and the superelasticity effect in a nonmartensitic Ti48.5Ni51.5 alloy, which has no martensitic transformation but under...
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We report a strategy to significantly improve the ductility and achieve large superelastic and shape memory strains in polycrystalline Cu–Al–Ni shape memory alloys that are normally brittle. We use a liquid-phase Taylor wire forming process to obtain microwires of 10–150 m diameter with a bamboo grain structure. The reduction of grain boundary area, removal of triple junctions, and introduction...
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Orientation dependence and tension/compression asymmetry of shape memory effect and superelasticity in ferromagnetic Co40Ni33Al27, Co49Ni21Ga30 and Ni54Fe19Ga27 single crystals Y. Chumlyakov a,∗, E. Panchenko a, I. Kireeva a, I. Karaman b, H. Sehitoglu c, H.J. Maier d, A. Tverdokhlebova a, A. Ovsyannikov a a Siberian Physical Technical Institute, Novosobornaya sq. 1, Tomsk 634050, Russia b Depa...
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Ni–Mn–Ga polycrystalline alloy fibers with diameters of 33 μm are reported to exhibit significantly improved ductility and huge superelastic and shape memory strains in comparison to conventional brittle bulk polycrystalline alloys. Particularly, the recoverable strain of the Ni54.9–Mn23.5–Ga21.6 fiber can be as high as 10% at 40 ◦C. Such optimized behavior has been achieved by a suitable fabri...
متن کاملDirect observation of hierarchical nucleation of martensite and size-dependent superelasticity in shape memory alloys.
Martensitic transformation usually creates hierarchical internal structures beyond mere change of the atomic crystal structure. Multi-stage nucleation is thus required, where nucleation (level-1) of the underlying atomic crystal lattice does not have to be immediately followed by the nucleation of higher-order superstructures (level-2 and above), such as polysynthetic laths. Using in situ trans...
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ژورنال
عنوان ژورنال: Strain
سال: 2009
ISSN: 0039-2103,1475-1305
DOI: 10.1111/j.1475-1305.2008.00528.x