Dissertation > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallurgy ( Physical Metallurgy ) > Physics of metals > The liquid structure of the metal and solidification theory

Solidification Behaviors of Fe-Sn Monotetic Alloys Imposed by a High Magnetic Field

Author HanHuan
Tutor WangEnGang
School Northeastern University
Course Materials Processing Engineering
Keywords Strong magnetic field Fe-Sn monotectic alloys Spin orientation Magnetic
CLC TG111.4
Type Master's thesis
Year 2008
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Monotectic alloy has many excellent physical and chemical characteristics, has broad application prospects, cause the majority of researchers. However, since most of monotectic alloys component density and melting point difference between the large and the larger temperature range and the composition range of the memory in the two immiscible liquid area, so easy to produce gravity segregation, conventional methods are difficult obtain a uniform organization. In recent years, the rapid development of superconducting magnetic field and application of the application of the magnetic field from the traditional iron-based magnetic material to the whole field, a material preparation process is an important new tool. Optimized by controlling the magnetic field conditions can be effectively suppressed monotectic alloy gravity segregation, this article is the use of a strong magnetic field to study its effect on this characteristic monotectic solidification behavior. In this paper, 12T superconducting magnetic field and 1200 ℃ vacuum furnace studied magnetic field on the Fe-Sn alloys solidified two yuan partial effect. Explores the Fe-46% Sn and Fe-49% Sn two alloys at different magnetic induction intensity, different process conditions microstructure variation and magnetic properties of the alloy, and theoretically analyzed, the following conclusions : In the absence of magnetic field conditions, Fe-Sn partial BMG Jinzhong Fu Fe phase mainly dendrite, cellular dendrite based, irregularly arranged in the matrix; while applying a magnetic field together Jinzhong Fu Fe Fe-Sn phase along the field direction present arranged in a certain orientation. (2) applying a strong magnetic field, Fe-46% Sn together Jinzhong Fu Fe phase is mainly characterized by bamboo-like, arranged along the magnetic field; while the Fe-49% Sn together Jinzhong Fu Fe phase was strip parallel to the magnetic field direction. And as the applied magnetic field intensity increases, the orientation of the alloy solidification arrangement increasingly apparent. 3.X-ray analysis showed that a strong magnetic field Fe-49% Sn alloy in a parallel magnetic field section of αFe (110) diffraction peak intensity. Theoretical analysis shows that parallel to (110) plane of the [001] axis αFe priority growth axis, in the magnetic field αFe along the [001] axis preferential growth, prompting oriented in Fe-rich phase. The Fe-46% Sn alloy, the application of a strong magnetic field parallel to the magnetic field section αFe (110) diffraction peak intensity of the impact is not significant. 4 in the case of slow cooling rate is more conducive to co Jinzhong Fu Fe-Sn Fe phase in the growth phase of the initial rotational orientation, to promote oriented in Fe-rich phase. 5 formed by applying a strong magnetic Fe-Sn alloy solidification orientation arrangement can significantly affect the Fe-Sn alloy magnetic properties. For the Fe-49% Sn alloy, the saturation magnetization Ms and the residual magnetization Mr with the solidification of applied magnetic field strength increases with the decrease of solidification cooling rate increases with the increase of the holding time; coercive force Hc of the solidification process is applied as the magnetic induction intensity increased with the increase, decrease as the cooling rate decreases with the increase of the holding time increase. For Fe-46% Sn alloy, the solidification of its magnetic field is applied to the impact of changes in volatility, unlike the Fe-49% Sn alloy so obvious.

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