Journal ArticleDOI
The effect of surface configuration on grain boundary sliding
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TLDR
In this paper, a method for estimating the internal sliding from surface measurements, and an analysis is made of detailed results published for α iron for grain boundary sliding during creep, is presented.Abstract:
In studies of grain boundary sliding during creep, it is necessary to distinguish between the strain due to sliding in the bulk of the specimen and the strain occurring at the surface. In general, these quantities are not the same, although the difference depends on the configuration of the surface grains. Methods are suggested for estimating the internal sliding from surface measurements, and an analysis is made of detailed results published for α iron.read more
Citations
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Journal ArticleDOI
A unified approach to grain boundary sliding in creep and superplasticity
TL;DR: In this paper, a unified model is developed for Rachinger boundary sliding at all grain sizes, where the rate of sliding is controlled by the rates of accomodation through intragranular slip.
Journal ArticleDOI
The mechanical properties of superplastic materials
TL;DR: The relationship between stress and strain rate is often sigmoidal in superplastic materials, with a low strain rate sensitivity at low and high strain rates (regions I and III, respectively) and a high strain rate sensitive at intermediate strain rate (region II) where the material exhibits optimal super-plasticity as discussed by the authors.
Journal ArticleDOI
Grain boundary sliding revisited: Developments in sliding over four decades
TL;DR: In this article, the authors reviewed the developments in grain boundary sliding over the last four decades including the procedures available for estimating the strain contributed by sliding to the total strain, ξ, and the division into Rachinger boundary sliding (GBS) in conventional creep and Lifshitz GBS in diffusion creep.
Journal ArticleDOI
Seventy-five years of superplasticity: historic developments and new opportunities
TL;DR: A review of the current understanding of the flow of superplastic metals and ceramics can be found in this paper, where a minor modification to the present definition of super-plasticity is proposed.
Journal ArticleDOI
Creep of ceramics
TL;DR: In this article, a wide range of experimental data on the creep of ceramics was analyzed and it was shown that there is an enhanced role of diffusion creep, and in the power-law regime, Ceramics divide into two categories with stress exponents of ∼ 5 and ∼ 3, respectively.
References
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Journal ArticleDOI
Grain boundary sliding as a deformation mechanism during creep
TL;DR: In this article, a model for grain boundary sliding is developed in which sliding occurs by the movement of dislocations along, or adjacent to, the boundary by a combination of climb and glide.
Journal ArticleDOI
An investigation of grain-boundary sliding during creep
R. L. Bell,T. G. Langdon +1 more
TL;DR: In this article, a detailed experimental study of the behavior of grain boundaries between surface grains has been carried out on a magnesium alloy, Magnox AL 80, and different methods of assessing the strain due to grainboundary sliding were compared; the general agreement obtained confirmed the view that, under conditions of low stress and high temperature, sliding can play a very important role in the overall deformation.
Journal ArticleDOI
The dependence of grain-boundary sliding on shear stress
TL;DR: In this paper, the dependence of grain-boundary sliding on the orientation of the boundary with respect to the applied stress was analyzed in detail on the basis of the hypothesis that sliding is governed by the component of applied stress resolved in the boundary plane.
Journal ArticleDOI
Surface and interior measurements of grain boundary sliding during creep
R. L. Bell,C. Graeme-Barber +1 more
TL;DR: This article measured grain boundary sliding on polycrystalline specimens of Magnox AL80, a magnesium-0.78 wt% aluminium alloy, at successive strains during creep at 200° C under a stress of 2800 psi.
Journal ArticleDOI
Topology of Surface Grains after Annealing or Creep
A. Gittins,R. C. Gifkins +1 more
TL;DR: In this article, the authors show that grain boundaries intersecting a free surface migrate during annealing or creep, becoming nearly perpendicular to the specimen surface and measuring the angles made with the surface by grain-boundary traces on the section.