Journal ArticleDOI
Diffusion-accommodated flow and superplasticity
M.F. Ashby,R. A. Verrall +1 more
TLDR
In this article, a new mechanism for superplastic deformation is described and modelled, which differs fundamentally from Nabarro-Herring and Coble creep in a topological sense: grains switch their neighbors and do not elongate significantly.About:
This article is published in Acta Metallurgica.The article was published on 1973-02-01. It has received 1307 citations till now. The article focuses on the topics: Coble creep & Diffusion creep.read more
Citations
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Mechanical properties of nanocrystalline materials
TL;DR: The mechanical properties of nanocrystalline materials are reviewed in this paper, with emphasis on their constitutive response and on the fundamental physical mechanisms, including the deviation from the Hall-Petch slope and possible negative slope, the effect of porosity, the difference between tensile and compressive strength, the limited ductility, the tendency for shear localization, fatigue and creep responses.
Journal ArticleDOI
Overview no. 65
TL;DR: In this article, the development of theories for normal grain growth in pure single phase systems is reviewed and a major theme which emerges is the interplay between the topological requirements for space filling and the kinetics of change in mean grain size with time.
Journal ArticleDOI
Ultra-strength materials
TL;DR: In this paper, an overview of the principal deformation mechanisms of ultra-strength materials is presented, and the fundamental defect processes that initiate and sustain plastic flow and fracture are described, as well as the mechanics and physics of both displacive and diffusive mechanisms.
Journal ArticleDOI
Deformation of nanocrystalline materials by molecular-dynamics simulation: relationship to experiments?
TL;DR: A review of the results of recent molecular-dynamics simulations of the structure and deformation behavior of nanocrystalline materials can be found in this article, where the authors provide insights into the intricate interplay between the dislocation and GB processes responsible for this crossover.
Journal ArticleDOI
On the rheology of the upper mantle
R. L. Stocker,M. F. Ashby +1 more
TL;DR: In this article, an approximate constitutive relationship for fluid phase transport in a partial melt is derived, and a set of rheologic material constants for olivine (Fo85-Fo95) are derived from a combination of experimental data and empirical generalizations.
References
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Journal ArticleDOI
Diffusional Viscosity of a Polycrystalline Solid
TL;DR: In this article, it is suggested that mosaic boundaries and boundaries between grains of nearly the same orientation may not serve as sources or sinks of the diffusion currents, in which case the creep rate will depend only on the configuration of grain boundaries having a sizable orientation differen...
Journal ArticleDOI
A Model for Boundary Diffusion Controlled Creep in Polycrystalline Materials
TL;DR: In this article, the authors discussed the mechanism of creep in polycrystalline alumina based on the differences between the lattice and boundary diffusion models and showed that the boundary diffusion model is more stable than lattice diffusion model, while the grain size dependence and the numerical constant are greater.
Book
The thermodynamics of the steady state
TL;DR: The thermodynamics of the steady state as mentioned in this paper, the thermodynamic properties of a steady state, and the steady-state thermodynamic model of the stationary state are discussed in detail.
Journal ArticleDOI
Superplasticity: A review
TL;DR: Superplastic behaviour in torsion was first reported by Saveur [2] and Pearson [3] as discussed by the authors, who first presented detailed observations of tensile superplasticity.