NDLI: Curie Temperature and Hopkinson Effect in Twin Roller Melt Spun <formula formulatype=inline><tex Notation=TeX>${hbox{Ni}}_{2}{hbox{MnGa}}$</tex> </formula> Shape Memory Alloys

Content Provider	IEEE Xplore Digital Library
Author	Pozo López, G. Fabietti, L.M. Condo, A.M. Winkler, E. Giordano, R.N. Haberkorn, N. Urreta, S.E.
Copyright Year	1965
Abstract	The temperature dependence of the magnetic polarization near the Curie temperature T_C in Ni₂MnGa stoichiometric alloys, directly processed from the melt in a twin-roller melt-spinning device, is investigated. The effect of the solidification rate on the Hopkinson peak detected is evaluated in samples quenched at three different tangential wheel speeds of 10, 15, and 20 m/s. The resulting microstructures were previously characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and by transmission electron microscopy (TEM). EDS results indicated that all the alloys have the composition Ni₂MnGa; at room temperature and above this temperature, a cubic L2₁ ferromagnetic ordered austenitic phase is observed. The Curie temperatures and the magnitude of the Hopkinson effect are estimated from the magnetic polarization versus temperature curves measured in a Faraday balance, in the range 300 K-400 K. As expected for samples with identical composition, the Curie temperatures remain insensitive to the processing route. At low fields (10 mT), the magnitude of the Hopkinson effect is larger in samples quenched at lower rates and it practically vanishes in all the alloys for applied fields near 100 mT.
Sponsorship	IEEE Magnetics Society
Starting Page	4514
Ending Page	4517
Page Count	4
File Size	1713717
File Format	PDF
ISSN	00189464
Volume Number	49
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature measurement Nickel Magnetostriction Temperature dependence Temperature distribution Spinning twin roller melt spinning Hopkinson effect ${\hbox{Ni}}_{2}{\hbox{MnGa}}$ shape memory alloys
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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