Undercooling and solidification of Ni77P23 alloy in a 52-m drop tube
Li Gong(李工)a)†, Gao Yun-Peng(高云鹏)a), Sun Yi-Nan(孙懿楠)a), Chi Zhao-Hong(迟照洪)b), and Liu Ri-Ping(刘日平)a)
a Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China; b National Microgravity Laboratory, Chinese Academy of Sciences, Beijing 100080, China
Abstract This paper applies techniques of containerless processing, drop tube and glass fluxing, to undercool and solidify Ni77P23 alloys. Different diameter spheres were collected at the bottom of a 52-m long drop tube. Both crystalline and amorphous phase were formed in various size specimens due to the different cooling rate. The variation of partial undercooling with bulk undercooling is calculated for the Ni77P23 alloys. The deep undercooling and rapid solidification behaviour of Ni77P23 melts has been analysed with respect to microstructure formation and transition during fluxing and 52-m drop process of undercooled melts.
Received: 11 January 2008
Revised: 21 February 2008
Accepted manuscript online:
Fund: Project supported by Hebei province
Natural Science Foundation of China (Grant No A200700296), National
Natural Science Foundation of China (Grant No 50731005) and National
Basic Research Program of China
(Grant No 2007CB616915/2006CB605201).
Cite this article:
Li Gong(李工), Gao Yun-Peng(高云鹏), Sun Yi-Nan(孙懿楠), Chi Zhao-Hong(迟照洪), and Liu Ri-Ping(刘日平) Undercooling and solidification of Ni77P23 alloy in a 52-m drop tube 2008 Chin. Phys. B 17 3412
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