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Thermal stability and microstructure of Ni-Mn-Ga-Cu high temperature shape memory alloys

Author
Santamarta, R.; Muntasell, J.; Font, J.; Cesari, E.
Type of activity
Journal article
Journal
Journal of alloys and compounds
Date of publication
2015-11-05
Volume
648
First page
903
Last page
911
DOI
https://doi.org/10.1016/j.jallcom.2015.07.054 Open in new window
URL
http://www.sciencedirect.com/science/article/pii/S0925838815304515 Open in new window
Abstract
The thermal stability and microstructure after ageing at 770 K for different times have been studied on six Ni-Mn-Ga-Cu polycrystalline high temperature shape memory alloys, in which Cu substituted Mn, Ga, or both simultaneously. Prior to ageing, those compositions with higher e/a ratio not only show higher martensitic transformation temperatures but also higher thermal hysteresis. The quaternary alloys that contain less Cu show the best thermal stability, almost independently from the element t...
Keywords
CRYSTAL-STRUCTURE, Metals and alloys, Microstructure, NI54MN25GA21, PHASE, Precipitation, Shape memory, Thermal analysis
Group of research
GRPFM - Research Group in Physical Properties of the Materials

Participants