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Microstructure and Magnetic Properties of Fe--Cr--15 Wt % Co Alloys with and Without V, V + Ti Additions

机译:添加和不添加V,V + Ti的Fe - Cr - 15 Wt%Co合金的显微组织和磁性

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The relationship between microstructure and magnetic properties of Fe--28Cr--15Co, Fe--23Cr--15Co--5V and Fe--23Cr--15Co--3V--2Ti (wt.%) alloys have been investigated by transmission electron microscopy, and Lorentz microscopy. The heat treatments adopted for the present investigation are (1) isothermal aging, (2) thermomagnetic treatment (TMT) + step-aging, and (3) TMT + continuous cooling. The morphology of the microstructure is very much affected by the aging temperature. Thermomagnetic treatment is very effective in elongation of the Fe--Co rich ( alpha sub 1 ) phase particles, and the elongation of the alpha sub 1 phase particles is independent of crystal orientation. Step-aging and continuous cooling produce optimum magnetic properties. During step-aging microstructural features remain essentially unchanged, and the composition difference of the two phases increases. Continuous cooling is an alternative way to produce optimum magnetic properties. Microstructural features are almost independent of the cooling rate, and then they must be developed mainly by the TMT. Lorentz microscopy results show that the domain walls tend to lie in the weakly ferromagnetic matrix phase and are pinned by Fe--Co rich ( alpha sub 1 ) phase particles as pinning sites (as opposed to the supposed single domain hardening). This observation suggests that the magnetization mechanism is governed by domain wall pinning. Magnetic domains are narrower in optimally treated alloys, and elongated parallel to the applied field. The anisotropy induced during TMT increases during step-aging or continuous cooling. The three alloys produce similar magnetic properties. However, due to their more facilitated heat treatments the alloys containing V and V + Ti additions would be of more industrial interest. (ERA citation 03:055485)

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