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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstmcture evolution and magnetic properties of hard magnetic FeCr22Co15 alloy subjected to tension combined with torsion
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Microstmcture evolution and magnetic properties of hard magnetic FeCr22Co15 alloy subjected to tension combined with torsion

机译：FeCr22Co15硬磁合金在拉伸和扭转作用下的组织演变和磁性能

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摘要

Axially symmetric magnets with good mechanical properties in the surface layer and good magnetic properties in the volume of material are essential in the production of increasing number of modern electrical devices. In order to obtain this type of gradient structure, two phase (α+γ) hard magnetic FeCr22Col 5 alloy was subjected to tension and torsion in temperature range 725-850℃. The microstructure observations of deformed samples showed the formation of gradient microstructure with minimum grain size (about 1 μm) in the surface layer of material. On the basis of TEM observations, it was found that the deformation resulted in the martensitic transformation of γ into α_γ phase. The microstructure observations also showed the presence of intermetallic σ phase (Fe-Cr) with the maximum precipitates amount in the surface layer of material. The measurements of magnetic properties showed decreasing coercive force of FeCr22Col5 alloy after deformation due to preservation of α_γ phase (about of 35%) in the microstructure after magnetic treatment. On the other hand, α_γ phase might have appeared as a plastic constituent among brittle grains of α phase, which had a positive influence on mechanical properties of the material.
机译：在生产越来越多的现代电气设备时，在表面层具有良好机械性能并在材料体积中具有良好磁性能的轴对称磁体至关重要。为了获得这种梯度结构，在725-850℃的温度范围内对两相（α+γ）硬磁FeCr22Col 5合金进行了拉伸和扭转。变形样品的微观结构观察表明，在材料的表面层中形成了具有最小晶粒尺寸（约1μm）的梯度微观结构。在TEM观察的基础上，发现变形导致γ从马氏体转变为α_γ相。显微组织观察还表明，在材料表层中存在最大的析出量的金属间σ相（Fe-Cr）。磁性能的测量表明，FeCr22Col5合金变形后的矫顽力降低，这是由于经过磁处理后在组织中保留了α_γ相（约35％）。另一方面，α_γ相可能作为α相的脆性晶粒中的塑性成分出现，这对材料的机械性能产生了积极的影响。

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