The influence of thermal treatment in the hydrogen environment on the iron-cobalt alloy magnetostriction
Journal Title: Вісник Тернопільського національного технічного університету - Year 2015, Vol 78, Issue 2
Abstract
Magnetic properties of materials are divided into two groups – the dependent and independent on the material structure. Magnetostriction is a characteristic that depends on both of these factors and can be both in ferromagnetic and antiferromagnetic metals. Magnetic materials can have both positive and negative magnetostriction. The magnetostriction constant describes the ability of magnetic materials to change their size while imposing a magnetic field or while exceeding the critical temperature of the magnetic transformation (Curie point). The research of the influence of temperature and time of the thermal treatment in a hydrogen environment on the magnetostriction constant of iron-cobalt alloy has been conducted. Dissolved hydrogen increases critical temperature of α-β transformation in cobalt and promotes selfdiffusision of the Co structure. The method of improving magnetostriction of alloy K50F2, in which the thermal treatment in the hydrogen was made with pressure 0,1 MPa to increase the volume content of the ordered phase FeCo has been proposed. It allows to drop the temperature of treatment to 150 K (from 1153 K to 1003 K) and reduce its duration from 5 to 4 hours taking into consideration the time of decontamination. The temperature and time intervals of forming hydride phases in vanadium, by which it is alloyed to improve plasticity to prevent the hydrogen imbrittleness under cooling, have been found. On the basis of carried out experimental researches there has been shown that the use of hydrogen as a technological environment during fragmentation and chemial-thermal processing treatment of magnet allows to increase the value of magnetostriction constant.
Authors and Affiliations
Yaroslav Zamora
Keywords
Related Articles
- EP ID EP571557
- DOI -
- Views 45
- Downloads 0
Experimental research of power parameters of the process of forming a shelf on screw blank
The article presents the methodology and results of experimental investigations of shelf shaping processes on screw blank. Technological processes of curved profile shaping on the screw blanks with using screw mandrels a...
Fracture pecularities of prestressed steel reinforcement under hydrogenation in the model working medium
Pecularities of fracture behaviour of progressively drawn pearlitic steels from the initial hot rolled bar (not cold drawn at all) to the final commercial product (prestressing steel wire) were investigated in air and un...
Load transfer from the infinite stringer to the two jammed along one edge identical stripes with initial (residual) stresses
The article is devoted to problems of contact interaction of infinite elastic stringer and two identical jammed along one edge pre-stressed stripes. The research has been conducted in the framework of linearized theory o...
Representation of narrow-band radio signals with angular modulation in trunked radio systems using the principal component analysis
The analysis of the narrow-band radio signals in the spectral representation features in the systems of trunked radio-systems has been carried out in the paper. Basing on it the application of the principal component ana...
Providing the coherence of biosignal system in information analytical biomedical
For controlling and diagnosing of functional state, for correction functions of biological object the method of electrophysiological active research of this object often use. In particularly the use of low level light in...