期刊
ACTA MATERIALIA
卷 118, 期 -, 页码 88-94出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.07.030
关键词
Elastocaloric effect; Elastic behavior; Martensitic phase transformation; Shape memory alloy
资金
- National Youth Science Foundation [51201100]
- Shanghai Pujiang Program [15PJ1404400]
- National Natural Science Foundation of China [51571032]
- Japan Society for the Promotion of Science [26289230]
- DOE Office of Science by the Argonne National Laboratory [DE-AC02-06CH11357]
- Grants-in-Aid for Scientific Research [26289230] Funding Source: KAKEN
The elastocaloric effect under tensile stress along the [001] direction has been investigated in an Fe-31.2Pd (at.%) alloy, which exhibits a weak first-order martensitic transformation at 230 K from a face centered cubic structure to a face-centered tetragonal (c/a < 1) structure. A stable temperature variation of 1.9 K was observed at room temperature (similar to 288 K) up to 10000 cycles of sinusoidal tensile stress (200 MPa). The stress-strain curve shows a macroscopic strain of 1.2% under 200 MPa with a negligible stress hysteresis. The macroscopic strain coincides with the lattice strain obtained by in situ X-ray diffraction. A significant extension of the 200 reflection, perpendicular to the tensile direction, was observed. This peak extension could be the way the specimen realizes a high elastic strain, even under tensile stress. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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