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Abstract
In the present study, vertical semi-continuous casting equipped with the electromagnetic stirring (EMS) was applied in order to control the solidification process and obtain the anticipated homogeneous microstructure for Cu-15Ni-8Sn alloy. The experimental results indicate that the microstructure of as-cast Cu-15Ni-8Sn (wt.%) alloy prepared by conventional casting consists of Sn-depleted α phase (α Cu(Ni) solid solution), Sn-rich γ phase ((CuxNi1-x)3Sn), and intermediate transition region (α+γ), and most of the Sn element mainly segregates at dendritic grain boundary. Discriminatively, some equiaxed grains come into being in as-cast Cu-15Ni-8Sn alloy prepared by vertical semi-continuous casting, and Sn-rich γ phases distribute on the matrix and grain boundary uniformly. Furthermore, the size of equiaxed grains becomes smaller after applying EMS, which reduces the segregation of Sn element to a large degree. In this study, microstructure evolution mechanism of Cu-15Ni-8Sn alloy prepared by conventional casting and by vertical semi-continuous casting without and with EMS is analyzed.
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Details
1 Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province), School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
2 State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan, 114000, China