According to the cr ys tallography condition of spheroidal crystal,it is required that the crystallite must have a large number of small angle branches which are distributing radiall y and symmetrically;besides,these small angle branches should have the feature of"regular branch"that means they have same growing babit and growing rate.

Machesani syndrome is characterized of brachydactyly and microspherophakia.

But the refinement effect of Ti-B is better then that of RE,the roundness of the globular grains obtained is better,the spheroidization velocity of the primary α-Al grains is faster.

The experimental result shows that RE can refine the globular grains of semisolid Al-alloy remarkably,improve the roundness and uniformity of globular grains.

The morphology of spherulites in nylon 69 and its formation conditions in isothermal crystallization have been studied by a polarizing microscope.

With the increase of Y the number of quasi-crystals substantially increases; in a certain range Mn accelerate the spherical quasi-crystals\' formation, while when exceeds a certain amount, conversely it inhibits the formation of quasi-crystals.

Effect of far field flow on the spherical crystal in the undercooled melt;