Fe-Ni-Al-Ti半硬磁合金中析出相的研究

The Study of Precipitation Phase of Semi-hard Fe-Ni-AI-Ti Magnetic Alloy in the Tempering Procese

本文研究了Fe-Ni-Al-Ti半硬磁合金回火时的磁硬化机理。通过回火过程的X射线衍射、透射电镜结果分析,认为:该合金回火时磁硬化的主要原因是有几种新相析出,而不是由于α→γ反向转变产生的奥氏体;这些析出相包括NiAl、Ni_3Al、Ni_2AlTi等顺磁性的有序相;工艺上广泛采用的650℃回火处理,析出相的尺寸约为0.2～0.5μm,它们在铁磁性基体中的弥散分布,使合金具有最佳的使用磁性能。本工作较我们的前一研究工作[5]更细微和定量。

The structures of precipitated phase of semi-hard magnetic Fe-Ni- Al-Ti alloy during tempering have been studied by X-ray and transmission electron microscopy. The results show that the magnetic hardening is due to the precipitation of new phases. Such precipitated phases include paramagnetic and ordering NiAl, Ni_3Al and Ni_2AlTi. The size of precipitation particles is about 0. 2-0.5μm after the second cold rolling and final tempering at 650℃. We think that the dispersed distribution of precipitated phase in ferromagne- tic matrix leads fo the most proper magnetic properties.