Microstructure of Al-Ti-B-Er refiner and its grain refining performance
来源期刊：Journal of Rare Earths2013年第6期
论文作者：马腾飞 陈子勇 聂作仁 黄晖
文章页码：622 - 627
摘 要：Al-Ti-B-Er refiner was successfully prepared by CR （contact reaction process）,a process based on SHS （self propagating high-temperature synthesis）.The microstructure of the alloy was studied by optical microscopy,X-ray diffraction （XRD）,scanning electron microscopy （SEM） equipped with energy-dispersive spectrometry.The results showed that Al-Ti-B-Er alloy was composed of α-Al,block-like TiAl3 and flocked TiB2.Compared with Al-Ti-B refiner,formation of TiAlEr compounds,Er modified the mor-phology of TiAl3 phase,and dispersed the TiB2 and TiAl3.An excellent grain refining performance was obtained when adding 1 wt.% Al-Ti-B-Er in Al-10Zn-1.9Mg-1.6Cu-0.12Zr alloy,the average grain size was about 40 μm.The refinement mechanism of Al-Ti-B-Er was also discussed.Er changed the morphology of TiAl3,TiB2 phase,the refiner would be more efficient.The decompo-sition of TiAlEr compounds which released Er refrained the growth of TiAl3 and made TiB2 difficult to aggregate or deposit,there-fore resulted in more particles being efficient nucleation substrate.
马腾飞，陈子勇，聂作仁，黄晖
School of Materials Science and Engineering,Beijing University of Technology
摘 要：Al-Ti-B-Er refiner was successfully prepared by CR （contact reaction process）,a process based on SHS （self propagating high-temperature synthesis）.The microstructure of the alloy was studied by optical microscopy,X-ray diffraction （XRD）,scanning electron microscopy （SEM） equipped with energy-dispersive spectrometry.The results showed that Al-Ti-B-Er alloy was composed of α-Al,block-like TiAl3 and flocked TiB2.Compared with Al-Ti-B refiner,formation of TiAlEr compounds,Er modified the mor-phology of TiAl3 phase,and dispersed the TiB2 and TiAl3.An excellent grain refining performance was obtained when adding 1 wt.% Al-Ti-B-Er in Al-10Zn-1.9Mg-1.6Cu-0.12Zr alloy,the average grain size was about 40 μm.The refinement mechanism of Al-Ti-B-Er was also discussed.Er changed the morphology of TiAl3,TiB2 phase,the refiner would be more efficient.The decompo-sition of TiAlEr compounds which released Er refrained the growth of TiAl3 and made TiB2 difficult to aggregate or deposit,there-fore resulted in more particles being efficient nucleation substrate.
关键词：
