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

研究成果: Conference article査読

抄録

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.

本文言語English
論文番号05
ページ(範囲)28-36
ページ数9
ジャーナルProceedings of SPIE - The International Society for Optical Engineering
5767
DOI
出版ステータスPublished - 2005 10 7
外部発表はい
イベントNondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure IV - San Diego, CA, United States
継続期間: 2005 3 82005 3 10

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • コンピュータ サイエンスの応用
  • 応用数学
  • 電子工学および電気工学

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