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xi tu chao ci zhi shen suo he jin jie jing xing mao yan jiu
Author(s): 
Pages: 75-80
Year: Issue:  3
Journal: Transactions of Materials and Heat Treatment

Keyword:  \ giant magnetostricitive alloycrystal morphologyzone melting directional solidification;
Abstract: The relationships between the crystal morphologies and crystal growth rate v and temperature gradient GL for the alloys with composition of Tb0.3Dy0.7(Fe1-xMx)1.95(M=Mn,Al,Ti,B,x=0.03) prepared by zone melting directional solidification have been studied. It was found that when the temperature gradient GL with a certain value, as increasing in crystal growth rate v, the crystal morphologies of alloys changes from planar to cellular, cellular dendrite and finally the developed dendrite. When the crystal growth velocity v is a value fixed, with increase of GL, the crystal morphologies change from developed dendrite to cellular dendrite and cellular. The samples with cellular dendrite possess 112 axial orientation and optimum magnaetostrictive properties.
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