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Title: Steady state and a general scale law of deformation
Authors: Huang, Y
Issue Date: 2017
Citation: IOP Conference Series: Materials Science and Engineering, 2017, 219 (1)
Abstract: © Published under licence by IOP Publishing Ltd. Steady state deformation has been characterized based on the experimental results for dilute single-phase aluminium alloys. It was found that although characteristic properties such as flow stress and grain size remained constant with time, a continuous loss of grain boundaries occurred as an essential feature at steady state. A physical model, which takes into account the activity of grain boundary dislocations, was developed to describe the kinetics of steady state deformation. According to this model, the steady state as a function of strain rate and temperature defines the limit of the conventional grain size and strength relationship, i.e., the Hall-Petch relation holds when the grain size is larger than that at the steady state, and an inverse Hall-Petch relation takes over if grain size is smaller than the steady state value. The transition between the two relationships relating grain size and strength is a phenomenon that depends on deformation conditions, rather than an intrinsic property as generally perceived. A general scale law of deformation is established accordingly.
ISSN: 1757-8981
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

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