Abstract
Based on the activation processes involved, a temperature-dependent micromechanical theory is developed to determine the viscoplastic behavior of a polycrystal from those of its constituent grains. This model assumes dislocation-glide to provide the only significant contribution to the overall plastic strain and it leads to the formulation of microconstitutive equations that describe the primary and steady-state creep of slip systems. These equations are used to describe the viscoplastic behavior of the slip systems and by which, that of the constituent grains. Together with the self-consistent relation, the viscoplastic stress-strain relations of a polycrystal under a constant total strain-rate are determined by an averaging process over the behavior of its constituent grains. The theory is applied to model the behavior of RR59 aluminum alloy at some selected strain rates and temperatures.
Keywords
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
H. J. Frost and M. F. Ashby. Deformation-Mechanism Maps. Pergamon Press, Oxford, 1982.
E. Kröner. Zur plastichen Verformung des vielkrystalis. Acta Metallurgica, 9:155–161, 1961.
G. J. Weng. Self-consistent determination of time-dependent behavior of metals. Journal of Applied Mechanics, 48:41–46, 1981.
A. E. Johnson and N. E. Frost. The temperature dependence of transient and secondary creep of an aluminum alloy to british standard 2142 at temperatures between 20 and 250 °C at constant stress. Journal of the Institute of Metals, 81:93–107, 1952.
U. F. Kocks. Laws for work-hardening and low-temperature creep. Journal of Engineering Materials and Technology, 98:76–85, 1976.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1991 Elsevier Science Publishers Ltd
About this paper
Cite this paper
Murali, K.M., Weng, G.J. (1991). Transition of Viscoplasticity from the Single Crystal to the Polycrystal Level. In: Boehler, JP., Khan, A.S. (eds) Anisotropy and Localization of Plastic Deformation. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3644-0_35
Download citation
DOI: https://doi.org/10.1007/978-94-011-3644-0_35
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-85166-688-1
Online ISBN: 978-94-011-3644-0
eBook Packages: Springer Book Archive