Abstract
The change in the magnetic and acoustic properties of nickel as a result of cold deformation and subsequent annealing is investigated. It was found that annealing leads to very significant changes in the magnetic and acoustic properties of nickel. The coercive force decreases 50 times with an increase in the annealing temperature to 800 °C. The Rayleigh coefficient, which characterizes the mobility of domain walls, monotonically increases by a factor of 20 over the entire investigated range of annealing temperatures. The greatest changes in the velocity and damping of longitudinal ultrasonic vibrations occur in the range of recrystallization temperatures. It is shown that to diagnose the structure and magnitude of residual stresses in nickel, it is advisable to determine its magnetic and acoustic parameters.
Highlights
In works [1,2,3,4,5,6] and a number of other works it was shown that the determination of the set of magnetic and magnetoacoustic characteristics makes it possible to reliably assess the structural-phase state, strength properties, as well as the stresses present in ferromagnetic materials
This possibility is due to the following reasons: 1) the interaction of moving domain boundaries with defects in the crystal structure and inhomogeneous stresses; 2) magnetoelastic effect - a change in magnetization and a change in the dynamics of 90degree domain walls when elastic stresses are applied to a ferromagnet; 3) magnetostrictive effect - a local change in the size of the ferromagnet due to the rearrangement of the domain structure
The purpose of this work was to determine the relationship between the magnetic and acoustic characteristics of nickel subjected to cold plastic deformation and subsequent annealing in order to identify promising diagnostic parameters for assessing its stress-strain state
Summary
In works [1,2,3,4,5,6] and a number of other works it was shown that the determination of the set of magnetic and magnetoacoustic characteristics makes it possible to reliably assess the structural-phase state, strength properties, as well as the stresses present in ferromagnetic materials This possibility is due to the following reasons: 1) the interaction of moving domain boundaries with defects in the crystal structure and inhomogeneous stresses; 2) magnetoelastic effect - a change in magnetization and a change in the dynamics of 90degree domain walls when elastic stresses are applied to a ferromagnet; 3) magnetostrictive effect - a local change in the size of the ferromagnet due to the rearrangement of the domain structure. By grinding, they were brought to dimensions of 5.38 x 5.38 x 65.0 mm and annealed at various temperatures for 1 hour
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