Structure and Phase Transformation of Ferromagnetic Shape Memory Alloy Ni49Mn30Ga21 Fine Particles Prepared by Spark Erosion

Y. J. Tang, David Smith, Hao Hu, F. E. Spada, H. Harper, A. E. Berkowitz

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Ni49Mn30Ga21 fine particles were prepared by spark erosion. Most of the particles are spheres with sizes ranging from about 5 nm to 100 μm. The particles have the martensite structure at room temperature as indicated by X-ray diffraction (XRD). Measurements of the temperature dependence of the magnetization and high-temperature XRD patterns demonstrated that the particles undergo a martensite → austenite phase transformation in the range 35 °C-70 °C during heating, with ∼10 °C hysteresis for the austenite → martensite transformation upon cooling.

Original languageEnglish (US)
Pages (from-to)3405-3407
Number of pages3
JournalIEEE Transactions on Magnetics
Volume39
Issue number5 II
DOIs
StatePublished - Sep 2003

Fingerprint

shape memory alloys
sparks
Electric sparks
Shape memory effect
Martensite
erosion
phase transformations
Erosion
Phase transitions
martensite
Austenite
austenite
X ray diffraction
Temperature
Diffraction patterns
Hysteresis
Magnetization
Cooling
Heating
x rays

Keywords

  • Magnetic shape memory
  • Martensitic transformation
  • NiMnGa alloys
  • X-ray diffraction

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Structure and Phase Transformation of Ferromagnetic Shape Memory Alloy Ni49Mn30Ga21 Fine Particles Prepared by Spark Erosion. / Tang, Y. J.; Smith, David; Hu, Hao; Spada, F. E.; Harper, H.; Berkowitz, A. E.

In: IEEE Transactions on Magnetics, Vol. 39, No. 5 II, 09.2003, p. 3405-3407.

Research output: Contribution to journalArticle

Tang, Y. J. ; Smith, David ; Hu, Hao ; Spada, F. E. ; Harper, H. ; Berkowitz, A. E. / Structure and Phase Transformation of Ferromagnetic Shape Memory Alloy Ni49Mn30Ga21 Fine Particles Prepared by Spark Erosion. In: IEEE Transactions on Magnetics. 2003 ; Vol. 39, No. 5 II. pp. 3405-3407.
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