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Cooling rate dependent undercooling of Bi in a Zn matrix by differential fast scanning calorimetry

Published online by Cambridge University Press:  17 December 2014

Linfang Li ,
Bingge Zhao ,
Bin Yang ,
Quanliang Zhang ,
Qijie Zhai  and
Yulai Gao
Linfang Li
Affiliation:
Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, People's Republic of China
Bingge Zhao
Affiliation:
Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, People's Republic of China
Bin Yang
Affiliation:
Institute of Physics, University of Rostock, Rostock 18051, Germany
Quanliang Zhang
Affiliation:
Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, People's Republic of China
Qijie Zhai
Affiliation:
Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, People's Republic of China
Yulai Gao*
Affiliation:
Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, People's Republic of China; and Laboratory for Microstructures, Shanghai University, Shanghai 200444, People's Republic of China
*
a)Address all correspondence to this author. e-mail: ylgao@shu.edu.cn
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Abstract

We presented the investigation on the cooling rate dependent undercooling of the microsized and nanosized Bi droplets in the Zn matrix via differential fast scanning calorimetry at scanning rates ranging from 300 to 6000 K/s. The experimental results demonstrated that the embedded nanosized Bi droplets gave more reproducible undercooling measurements than that of microsized Bi droplets at the grain boundaries. In addition, different cooling rate dependences of undercooling of microsized and nanosized Bi droplets were found. When the cooling rate is increased from 300 to 6000 K/s, the undercooling of the embedded nanosized Bi droplets increased gradually from 125 to 130 K. However, for microsized Bi droplets at the grain boundaries, there was an obvious increase of undercooling when the cooling rate was higher than 2000 K/s. In other words, the undercooling evolution displayed a sigmoidal relationship with the increase in cooling rate, indicating the change of the heterogeneous nucleation mechanism from a surface-induced mode to a volume-induced one.

Keywords

rapid solidificationnanostructurecalorimetry
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 2 , 28 January 2015 , pp. 242 - 247
Copyright
Copyright © Materials Research Society 2015 

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References

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