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Application of a self-consistent model to study the flow behavior of CuZn39Pb3 at elevated temperatures

Published online by Cambridge University Press:  13 November 2015

A. Momeni
A. Momeni*
Affiliation:
Department of Materials Science and Engineering, Hamedan University of Technology, 6516913733 Hamedan, Iran
*
a)Address all correspondence to this author. e-mail: ammomeni@aut.ac.ir
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Abstract

Hot compression tests were carried out on the duplex α + β leaded brass CuZn39Pb3 in temperature range of 600–800 °C and at strain rates of 0.001–1 s−1. A self-consistent model was used to analyze the flow behavior of the constituents and the material. A linear viscoplastic model was used to relate the flow stress of β and α + β composite to strain rate and the corresponding viscosity parameters were calculated at various deformation conditions. Using the viscosity parameters of β and α + β and the volume fractions of the constituents, the viscosity parameter of α was calculated. The values of the viscosity-like parameters and strain rate sensitivity for β and α + β composite were calculated using the nonlinear powerlaw viscoplastic equation. The results showed that the flow stress of α calculated using the self-consistent model was considerably higher than that of β. The difference could be attributed to the lower Zn content in α. The flow stress of α + β composite was calculated using the law of mixture rule. The law of mixture modeling of α + β composite for the iso-strain condition resulted to the overestimation of flow stress. The difference between the experimental and predicted results was attribute to the strain partitioning between α and β.

Keywords

hot pressingCustress/strain relationshipbrassmodeling
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 22 , 27 November 2015 , pp. 3453 - 3460
Copyright
Copyright © Materials Research Society 2015 

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