Resistivity study of eutectoid decomposition kinetics of α-Fe 2Si5 alloy

9Citations
Citations of this article
11Readers
Mendeley users who have this article in their library.

Abstract

The kinetics of the eutectoid decomposition α → β+ Si in a sintered α-Fe2Si5 alloy under isothermal conditions has been studied by using electrical resistivity technique. X-ray diffraction was applied to determine the relation of resistivity and transformed volume fraction by quantitative analysis. The time-temperature-transformation (TTT) diagram for the reaction was obtained in the temperature range of 873-1148 K. The TTT diagram shows a typical C shape and gets nose at 1073 K. A general expression of Johnson-Mehl-Avrami (JMA) equation was proposed by introducing a constant, which is associated with spatial distribution of nucleation. The mechanism of the transformation was discussed in the theoretical frame of the modified JMA theory. The Avrami exponent was found to change with temperature, n = 3.8 above 1073 K and n = 3.0 in the region of 873-1073 K. The results indicated that an interface controlled three-dimensional growth is responsible for the β formation in the eutectoid decomposition under the conditions of decreasing nucleation rate above 1073 K but zero nucleation rate (site saturation of nucleation) in the region of 873-1073 K. The activation energy associated with the eutectoid decomposition, obtained in the lower temperature range, was 132.8kJ/mol. © 2005 The Japan Institute of Metals.

Cite

CITATION STYLE

APA

Jiang, J., Matsugi, K., Sasaki, G., & Yanagisawa, O. (2005). Resistivity study of eutectoid decomposition kinetics of α-Fe 2Si5 alloy. In Materials Transactions (Vol. 46, pp. 720–725). https://doi.org/10.2320/matertrans.46.720

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free