Ultrahigh anisotropic damping in ferromagnetic shape memory Ni-Mn-Ga single crystal

Min Zeng, Siu Wing Or, Helen Lai Wa Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)

Abstract

Damping behavior with an oscillating bending force applied to each of the three different crystallographic planes a-b, a-c, and c-a is measured in a tetragonal ferromagnetic shape memory Ni50Mn29Ga21single crystal at different combinations of frequency and temperature by a dynamic mechanical analysis method. The results show a frequency-independent anisotropic damping behavior in the martensitic phase with a loss factor of 0.03, a high loss factor of 0.15, and an ultrahigh loss factor of 0.26 for the a-b, a-c, and c-a crystallographic planes, respectively. The observed anisotropic damping behavior is found to originate from the reorientation of different numbers of martensitic twin variants upon bending. It is also adjustable by an applied magnetic field via the control of the martensitic twin-variant bending states.
Original languageEnglish
Pages (from-to)565-568
Number of pages4
JournalJournal of Alloys and Compounds
Volume493
Issue number1-2
DOIs
Publication statusPublished - 18 Mar 2010

Keywords

  • Anisotropic damping
  • Dynamic mechanical analysis
  • Ferromagnetic shape memory alloys
  • Martensitic twin variants
  • Ni-Mn-Ga single crystal

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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