期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 27, 期 7, 页码 1636-1644出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(17)60186-9
关键词
impinging droplet; secondary dendrite arm spacing; cooling rate; heat transfer; drop on demand
资金
- National Natural Science Foundation of China [51301143]
- National Postdoctoral Foundation of China [2014M560727]
- Sichuan Province Science-Technology Support Plan, China [2015GZ0228]
- Science and Technology Innovation Project of SWJTU University, China [2682014CX001]
Different sized single droplets of Cu-6% Sn alloy were prepared by drop on demand (DOD) technique. The secondary dendrite arm spacing was measured and correlated with the droplet cooling rate by a semi-empirical formula. The microstructure of droplets was observed by optical microscopy (OM) and electro backscatter diffraction (EBSD). The dendrite feature of single droplets depends on solidification rate, cooling medium and flight distance. When droplets collide with each other at temperatures between solidus and liquidus, the dendrites and grains are refined obviously possibly because the collision enhances the heat transfer. The cooling rate of colliding droplets is estimated to be more than 4x10(4) K/s based on a Newton's cooling model. The dendrites grow along the colliding direction because of the temperature gradient induced by the internal flow inside the droplets.
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