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Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation
Published on: May 2, 2016
The recalescence rate of cooling curve for undercooled solidification
Junfeng Xu1, Tian Yang2, Zhuo Li2
1The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi, 710021, P.R. China. xujunfeng@mail.nwpu.edu.cn.
Abstract:
Recalescence rate (R) in cooling curve is well known that affected by undercooling in solidification, but the accurate relationship of them is not clear yet. In this paper, based on the undercooled solidification of Fe-B alloy, the factor affected on recalescence process was investigated. The relationship R = VΔT/D was first found, where V is the growth velocity, ΔT the recalescence degree (approximate the undercooling), D the focus region diameter dependent on the distance of the pyrometer. With this result the solidification interface growth velocity can be predicted from recalescence of cooling curve, vice versa. In addition, an approximate relation between growth velocity and the size of the critical nucleus was shown.
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