| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 10666250 | Materials Letters | 2005 | 5 Pages |
Abstract
The directional solidification of highly undercooled eutectic Ni78.6Si21.4 alloy is firstly achieved. In contrast with the conventional solidification, it occurs under a negative gradient at the solid/liquid interface. The essential condition for the processing is that the thermal diffusion in liquid plays a dominant role in the crystal growth. A directional solidification Ni3Si dendrite structure is obtained at the undercooling of 72 K. The other directional solidification a-Ni dendrite is derived at the undercooling of 195 K. Thermodynamic modeling of homogeneous nucleation is applied in undercooled eutectic Ni78.6Si21.4 alloy. It is found that Ni3Si is easier nucleation than a-Ni in undercooled eutectic Ni78.6Si21.4 melt. Calculated dendrite growth velocities confirm the predicted tendency of dendrite growth on the foundation of LKT/BCT theories.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Yiping Lu, Gencang Yang, Zengzhe Xi, Haipeng Wang, Yaohe Zhou,