Microstructure Evolution of Cu-15Ni-8Sn Alloy Prepared by Vertical Semi-continuous Casting with EMS

9th International Symposium on Electromagnetic Processing of Materials

材料科学;物理学

Guo, Zhongkai^1 ; Jie, Jinchuan^1 ; Yue, Shipeng^1 ; Li, Tingju^1 ; Guo, Qingtao^2

Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province), School of Material Science and Engineering, Dalian University of Technology, Dalian, Liaoning

116024, China^1

State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan

114000, China^2

关键词: Conventional casting;    Dendritic grains;    Electromagnetic stirring;    Homogeneous microstructure;    Micro-structure evolutions;    Semi-continuous casting;    Solidification process;    Transition regions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/424/1/012073/pdf
DOI  :  10.1088/1757-899X/424/1/012073

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

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.