Evaluation of stress-induced martensite phase in ferromagnetic shape memory alloy Fe-30.2at%Pd by non-destructive barkhausen noise

Yasubumi Furuya, Teiko Okazaki, Takasi Ueno, Mark Spearing, Manfred Wutting

Research output: Contribution to journalConference articlepeer-review

Abstract

Barkhausen noise (BHN) method seems a useful technique to non-destructive evaluation of martensite phase transformation of ferromagnetic shape memory alloy, which is used as the filler of our proposing " Smart Composite Board". The concept of design for "Smart Composite Board" which can combine the non - destructive magnetic inspection and shape recovery function in the material itself was formerly proposed. In the present study, we survey the possibility of Barkhausen noise (BHN) method to detect the transformation of microscopic martensite phase caused by stress-loading in Fe-30.2at%Pd thin foil, which has a stable austenite phase (fcc structure) at room temperature. The BHN voltage was measured at loading stress up to 100 MPa in temperature range of 300K to 373K. Stress-induced martensite twin was observed by laser microscope above loading stress of 25 MPa. A phase transformation caused by loading stress were analyzed also by X-ray diffraction. The signals of BHN are analyzed by the time of magnetization and the noise frequency. BHN caused by grain boundaries appears in the lower frequency range (1kHz-3kHz) and BHN by martensite twin in the higher frequency range(8kHz - 10kHz). The envelope of the BHN voltage as a function of time of magnetization shows a peak due to austenite phase at weak magnetic field. The BHN envelope due to martensite twins creates additional two peaks at intermediate magnetic field. BHN method turns out to be a powerful technique for non-destructive evaluation of the phase transformation of ferromagnetic shape memory alloy.

Original languageEnglish
Article number05
Pages (from-to)28-36
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5767
DOIs
Publication statusPublished - 2005 Oct 7
Externally publishedYes
EventNondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV - San Diego, CA, United States
Duration: 2005 Mar 82005 Mar 10

Keywords

  • Barkhausen noise
  • Ferromagnetic shape memory alloy
  • Nondestructive evaluation
  • Phase transformation
  • Stress-induced martensite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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