文档介绍：740 YAN Chunlei et al: Microstructure Reflnement of Al-5Ti-B Grain Reflner ...
to modify the size and distribution of secondary phase
particles in Al-5Ti-B. Yu et al[18] manufactured an Al-
Fine grain size can effectively reduce shrinkage 5Ti-B with stable refinement properties using  equal
and segregation, which results in aluminum alloy with channel angular pressing  (ECAP). Researchers have
excellent properties[1-5]. Currently, adding grain reflners developed many grain refining methods in recent
to the melts is still one of the most commonly adopted years[15,19-23], among which the pulsed electromagnetic
ways to fine the grain size[6-11]. The grain refiners can fleld is one of the research hotspots of grain reflnement
control grain size and morphology, which is attributed methods in recent years. It is available for a variety of
to promote heterogeneous nucleation [12]. Therefore, metals, and possesses several advantages such as con-
there is an important relevance to flnd a new technol- venient operation, meeting metals cleanliness require-
ogy that can significantly contribute to improve the ments, and saving energy[24-28].
reflning ability of grain reflners[13-15]. Wang et al[16] sug- However, the mechanism of grain reflnement with
gested that the principa