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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Pasquale, M. Sasso, C.P. Besseghini, S. Lograsso, T. |
| Copyright Year | 2002 |
| Description | Author affiliation: IENGF, Torino, Italy (Pasquale, M.; Sasso, C.P.) |
| Abstract | Summary form only given. In Ni-Mn-Ga shape memory ferromagnetic alloys a giant strain may be obtained by applying an external magnetic field to single crystals in the martensitic phase. It has been shown that the mechanism producing a giant strain is due to the motion of the martensite twin boundaries. In this work we discuss the equivalence between magnetic and mechanical energy through the comparison of mechanical stress-strain curves with magnetic field-strain curves obtained at a temperature T below the martensite transition temperature, where the single crystals may exhibit a super-plastic mechanical behavior. It is shown that a repeatable strain behavior (due to mechanical or magnetic excitation) can be obtained on samples which have been stabilized by a series of mechanical cycles. For this purpose N/sub 47.34/Mn/sub 32.32/Ga/sub 20.34/ and Ni/sub 50/Mn/sub 29.5/Ga/sub 20.5/ single crystals are prepared by the Bridgman method and cut after orientation by Laue diffraction in a final rectangular geometry with [110] and [100] faces. To obtain the mechanical characteristics the samples are subjected to compressive stress along the [100] direction in an automatic testing machine measuring stress and strain under controlled temperature conditions. Once a stable mechanical behavior is obtained, a combination of mechanical stress and magnetic field is applied to obtain a very large deformations by motion of the martensite twin boundaries. Stress, strain and magnetization are measured in the longitudinal sample direction, corresponding to the [100] crystallographic axis. It is found that during the super-plastic behavior a strain of about 2% can be obtained with an increase of the applied compressive stress of the order of 2 MPa and this mechanical excitation can be substituted by an applied magnetic field of the order of 0.5 T. |
| Sponsorship | Magnetic Soc. IEEE |
| File Size | 128560 |
| File Format | |
| ISBN | 0780373650 |
| DOI | 10.1109/INTMAG.2002.1000637 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2002-04-28 |
| Publisher Place | The Netherlands |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Mechanical factors Shape memory alloys Magnetic field induced strain Crystals Compressive stress Strain measurement Magnetic field measurement Temperature Stress measurement Iron alloys |
| Content Type | Text |
| Resource Type | Article |
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