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Acta Metall Sin  1985, Vol. 21 Issue (1): 64-68    DOI:
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LATTICE CONFORMATION THEORY ON MECHANISM OF SPHERULITIC GRAPHITE FORMATION IN CAST IRON CONTAINING Ce AND Mg
YU Ruihuang(S.H.Yu);LIU Zhaoyun(Department of Physics;Jilin University;Changchun
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YU Ruihuang(S.H.Yu);LIU Zhaoyun(Department of Physics;Jilin University;Changchun. LATTICE CONFORMATION THEORY ON MECHANISM OF SPHERULITIC GRAPHITE FORMATION IN CAST IRON CONTAINING Ce AND Mg. Acta Metall Sin, 1985, 21(1): 64-68.

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Abstract  The formation of spherulites of graphite in cast iron containing Ce and Mgwas studied.X-ray pattern and electron probe showed the presence of Ce in theform of CeS of NaCl B1 type and of CeC_2 of b.c.tetragonal C11a type crystalstructures.On the basis of the lattice constants of CeS,MgS,graphite and CeC_2,the sizes of the hexagonal nets of Ce,Mg and of graphite are calculated.It isfound that certain Ce or Mg atoms in the hexagonal nets planes normal to[111],[111],…are in conformity with the C atoms of the hexagonal nets of graphite.Due to the difference of electronegativities between Ce and C or between Mg andC of graphite,the electrostatic coulombic force from Ce or Mg will attract the Catoms precipitated from the melted liquids of cast iron to deposite as hexagonallayers on layers of graphite along the eight directions[111],[111],…of CeS orMgS.The result is the formation of spherulites of graphite.The conformation theC atoms in CeC_2 with the Ce or Mg atoms in the hexagonal nets of CeS or MgSalong the directions[100],[010],…is also briefly introduced.
Received:  18 January 1985     
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