MAGNETOACOUSTIC AND BARKHAUSEN EMISSION IN FERROMAGNETIC MATERIALS
MAGNETOACOUSTIC AND BARKHAUSEN EMISSION IN FERROMAGNETIC MATERIALS
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DOI：
10.1098/rsta.1986.0124
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发表时间：
1986-11-26
期刊：
影响因子：
5
通讯作者：
SCRUBY, CB
中科院分区：
文献类型：
--
作者：
BUTTLE, DJ;BRIGGS, GAD;SCRUBY, CB
磁声发射（MAE）和巴克豪森发射（BE）已被研究在铁磁材料放置在磁场，变化在几毫赫兹。两种信号的比较表明在给定场强下负责活动的畴壁的性质。为了对试样进行表征，测量了磁滞回线周围的发射强度。该技术已被用于非破坏性地测量以下影响。(a)析出物：MAE和BE对incoly 904中析出物的生长都很敏感，可以用来监测析出物的大小。(b)位错：BE和MAE对塑性变形表现出很高的敏感性，这已经在a-Fe中进行了研究。(c)辐射：铁-铜合金的中子辐照在发射方面产生很小的变化，但具有足够的灵敏度，可以有用地描述辐射效应。(d)拉应力：MAE对整个范围内的应力都很敏感，特别是在低应力下。这些测量为使用MAE进行残余应力测量奠定了基础。
Magnetoacoustic emission (MAE) and Barkhausen emission (BE) have been studied in ferromagnetic materials placed in a magnetic field, varying at a few millihertz. Comparison of the two signals indicates the nature of the domain walls responsible for the activity at a given field strength. In order to characterize a specimen the strength of the emission around the hysteresis loop is measured. The technique has been used to measure non-destructively the effects of the following. (a) Precipitates: both MAE and BE are sensitive to the growth of precipitates in Incoloy 904, and can be used to monitor the precipitate size. (b) Dislocations: BE and MAE exhibit high sensitivity to plastic deformation, and this has been studied in a-Fe. (c) Radiation: neutron irradiation of an Fe-Cu alloy produces small changes in emission, although with sufficient sensitivity for useful characterization of radiation effects. (d) Tensile stress: MAE is sensitive to stress over the whole range, but particularly at low stresses. Such measurements lay the foundation for the use of MAE for residual-stress measurements.