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MAGNETO MECHANIC DAMPING IN AN Fe Nb CALLOY

N.Yu , D.J.Wang and J.W.Ji College of Science of Northeastern University , Shenyang 110006 , China

金属学报(英文版)

heinternalfriction at400 850 ℃in a high pure Fe Nb Calloy hasbeen measured, and a largestress dependent magnetomechanicalhysteresisdamping peakof whichthe peaktempera turevariesfrom 666 to740℃asstrain amplitudechanges wasdiscovered. Theconditionsof the peak appearing and disappearing,somecharactersofthepeakandtheeffectofsomefac torsuch asascending and descending temperature, frequency, amplitude, deformation andannealing etconthe peak havealso beenstudied. The method to determinetheinternalstress σstand σi obstructing Barkhausen jumps of domains by internal friction experiences and the physical mechanism producingthe magnetomechanicalhysteresisdamping temperature( Qm 1 T) peakinthealloy were proposed.

关键词: internalfriction , null

INTERNAL FRICTION AND MODULUS DEFECT ASSOCIATED WITH THE MICROCRACKS IN MATERIALS

Q.F.Fang Laboratory ofInternal Friction and Defectsin Solids , Institute of Solid State Physics , The Chinese Academy of Sciences , Hefei230031 , China

金属学报(英文版)

Inthis paper, theinvestigation of applying internalfriction ( ultrasonic attenuation) andmodulus defect(ultrasonic velocity change) tostudy the variation of dislocation density andlooplength withcycle numberintheearly fatiguestageisreviewed. On this basis,thecon ceptof characterization of fatigue microcrackformation and propagation assessed bythe mea surementofinternalfriction and dynamicalelastic modulusissuggested. Theanalyticalex pressionoftheinternalfriction and modulus defect associated with microcracksiscalculated underthe assumptionthatthe mechanicalenergy dissipation iscaused by the mutualfriction betweentheoppositefacesofthe microcrack.

关键词: internalfriction , null , null

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