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Functional stability of a ferromagnetic polycrystalline Ni2MnGa high temperature shape memory alloy
| File | Description | Size | Format | |
|---|---|---|---|---|
 MA-Ni2MnGa-Scripta-R1-2col.pdf | Accepted version | 1.47 MB | Adobe PDF | View/Open |
| Title: | Functional stability of a ferromagnetic polycrystalline Ni2MnGa high temperature shape memory alloy |
| Authors: | Azeem, MA Jones, NG Raghunathan, SL Vorontsov, VA Dye, D |
| Item Type: | Journal Article |
| Abstract: | Electrocaloric Ni 2 MnGa is of interest for solid state refrigeration applications, as well as a high temperature thermal shape memory alloy. Here, polycrystalline Ni 54 Mn 25 Ga 21 is examined using in situ synchrotron X-ray di raction. The initial martensite ( M f ) and austenite ( A f ) finish temperatures were found to be 232 C and 298 C respectively. M f was observed to decline by 8 C / cycle and A f increased by 1 C / cycle. Both below and surprisingly, above the Curie temperature, the application of an e.m.f. was found to a ect the lattice parameters measured. A change in the thermal expansion of the two phases was found around the Curie temperature. |
| Issue Date: | 29-Dec-2016 |
| Date of Acceptance: | 9-Dec-2016 |
| URI: | http://hdl.handle.net/10044/1/43117 |
| DOI: | https://dx.doi.org/10.1016/j.scriptamat.2016.12.012 |
| ISSN: | 1359-6462 |
| Publisher: | Elsevier |
| Start Page: | 274 |
| End Page: | 277 |
| Journal / Book Title: | Scripta Materialia |
| Volume: | 130 |
| Copyright Statement: | © 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Sponsor/Funder: | British Council (India) Rolls-Royce Plc Engineering & Physical Science Research Council (EPSRC) |
| Funder's Grant Number: | IND/CONT/06-07/164E N/A EP/H004882/1 |
| Keywords: | Science & Technology Technology Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Science & Technology - Other Topics Materials Science Ferromagnetic shape memory alloy Synchrotron radiation Thermal expansion Intermetallic compounds FIELD-INDUCED STRAIN CRYSTAL-STRUCTURE MAGNETIC-FIELD MARTENSITIC-TRANSFORMATION PHASE-TRANSFORMATION GIANT NI54MN25GA21 EVOLUTION BEHAVIOR DETECTOR Materials 0912 Materials Engineering 0913 Mechanical Engineering |
| Publication Status: | Published |
| Appears in Collections: | Materials Faculty of Natural Sciences Faculty of Engineering |