Abstract
The paper presents the results of a complementary study including magnetic hysteresis loops B( H), magnetic Barkhausen noise (MBN) and magnetoacoustic emission (MAE) signals measurements for plastically deformed Fe–2%Si samples. The investigated samples had been plastically deformed with plastic strain level ( ε p ) up to 8%. The properties of B( H) loops are quantified using the coercivity H C and maximum differential permeability μ rmax as parameters. The MBN and MAE voltage signals were analysed by means of rms-like voltage ( Ub and Ua, respectively) envelopes, plotted as a function of applied field strength. Integrals of the Ub and Ua voltages over half of a period of magnetization were then calculated. It has been found that H C and integrals of Ub increase, while μ rmax decreases monotonically with increasing ε p . The MAE ( Ua) peak voltage at first decreases, then peaks at ε p ≈1.5% and finally decreases again. The integral of the Ua voltage at first increases for low ε p and then decreases for ε p >1.5%. All those various dependence types suggest the possibility of detection of various stages of microstructure change. The above-mentioned results are discussed qualitatively in the paper. Some modelling of the discussed dependency is also presented.
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