Mechanical oscillations in TiNi under synchronized martensite transformations
Article Abstract:
The effect of rapid martensitic transformations on the unforced oscillations of a TiNi alloy wire torsional pendulum was investigated. The study allowed controlling oscillations by stimulating the reverse phase transformation, and conditions for deriving high damping, oscillations generation and sustained vibrations were demonstrated. Based on the account of the basic functional mechanical behavior of shape memory alloys, the observed dependence of the oscillations decrement was elaborated.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1999
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Modeling of martensite accommodation effect on mechanical behavior of shape memory alloys
Article Abstract:
A model is proposed to explain microplastic deformation and stress of shape at accommodation of martensite that strongly affect the mechanical behavior of shape memory alloys. The effect is particularly evident at cyclic variations of temperature or stress. The model describes this kind of microplasticity as incomplete recovery of strain, accumulation at thermocycling and repeated two-way shape memory effect. Results of modeling are qualitatively consistent with experimental data.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1999
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In-situ investigations of the martensic transformation in TiNi by synchrotron radiation
Article Abstract:
The stress-induced martensite transformation in TiNi at room temperature was analyzed in situ using synchrotron X-ray diffraction method. Martensic transformation in TiNi changes from a high-temperature B2 structure to a low-temperature monoclinic B19' phase. The results show that in the alloys with termperature-induced martensite in the beginning condition, a nonperiodic fluctuation of intensity of the X-ray reflexes appeared because of anomalous transformation.
Publication Name: Journal of Engineering Materials and Technology
Subject: Science and technology
ISSN: 0094-4289
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
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