Fe-Ni-Co-Al-Cu-Ti永磁合金高温下析出行为的X射线小角散射研究

Precipitation behaviors of Fe-Ni-Co-Al-Cu-Ti permanent magnet alloy at elevated temperature by means of SAXS

利用小角Ｘ射线散射技术研究了淬火态Ｆｅ－ Ｎｉ－ Ｃｏ－ Ａｌ－ Ｃｕ－ Ｔｉ 永磁合金在８００ ℃保温不同时间时析出相的尺寸和比表面积的变化．初步分析了固溶淬火过程中形成的析出相的形状．揭示了析出相保温过程中的长大规律．结果表明，析出相的长大规律主要是小粒子溶解，较大棒状粒子是以长轴尖角溶解，长轴缩短，而径向尺寸增加的方式长大，长大过程中长径比减小．广角衍射证实在保温时间较长时，合金中出现新相．

Variations of size and specific area of precipitates in Fe-Ni-Co-Al-Cu-Ti alloy aged at different time at 800 ℃ have been investigated by means of small angle X-ray scattering(SAXS) technique. The shape of precipitates was determined and precipitates grow by smaller particles dissolving and larger ones increasing in radial size with dissolving angular zones at its longitudinal ends, while the ratio of aspect of precipitates decreased. Furthermore, wide angle diffraction confirmed that other novel phases formed in the alloy when it was aged longer at800 ℃.