Liquid State Undercoolability and Crystal Growth Kinetics of Ternary Ni-Cu-Sn Alloys
Na Yan, Liang Hu, Ying Ruan, Wei-Li Wang, Bing-Bo Wei**
Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072
Abstract ：The liquid state undercoolability and crystal growth kinetics of ternary Ni-5%Cu-5%Sn and Ni-10%Cu-10%Sn alloys are investigated by the glass fluxing method. In these two alloys, experimental maximum undercoolings of 304 K (0.18$T_{\rm L})$ and 286 K (0.17$T_{\rm L})$ are achieved and the dendritic growth velocities attain 39.8 and 25.1 m/s, respectively. The transition of morphology from coarse dendrite into equiaxed structure occurs and the grain size of the $\alpha$ (Ni) phase decreases remarkably when the undercooling increases. Both the lattice constant and microhardness increase obviously with the enhancement of undercooling. The enrichment of Cu and Sn solute contents reduces the dendritic growth velocity, while enhances the lattice constant and microhardness of $\alpha$ (Ni) phase.
收稿日期: 2016-06-27
出版日期: 2016-10-27
:
81.30.Fb
(Solidification)
81.10.Aj
(Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)
61.82.Bg
(Metals and alloys)
62.20.Qp
(Friction, tribology, and hardness)
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2016, Vol. 33 
