New method for analyzing recrystallization kinetics of deformed metal by differential scanning calorimeter

The drawn copper wires have been analyzed by differential scanning calorimeter (DSC) and a new method, which uses DSC measurements to determine the Johnson-Mehl-Avrami-Kolmogorov (JMAK) exponent via introducing Arrhenius behavior and modifying the baseline of DSC curves, has been proposed. The resul...

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Bibliographic Details
Published in:Journal of Central South University 2015-03, Vol.22 (3), p.849-854
Main Authors: Chen, Jian, Ma, Xiao-guang, Li, Jun, Yao, Yu-hong, Yan, Wen, Fan, Xin-hui
Format: Article
Language:English
Subjects:
Engineering
Metallic Materials
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Summary:The drawn copper wires have been analyzed by differential scanning calorimeter (DSC) and a new method, which uses DSC measurements to determine the Johnson-Mehl-Avrami-Kolmogorov (JMAK) exponent via introducing Arrhenius behavior and modifying the baseline of DSC curves, has been proposed. The results show that JMAK exponent and recrystallization activation energy of the drawn copper wires with a strain of 2.77 are about 2.39 and 125 kJ/mol, respectively. The line linking the tangency points of DSC curve hypotenuse can be used as the baseline when calculating recrystallization fraction. The JMAK exponent obtained by the DSC method is in a good agreement with that obtained by microhardness measurements. Compared to traditional methods to measure the exponent, the proposed method is faster and less labor intensive.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-015-2592-9