Author
J. W. Edington
Other affiliations: University of Delaware
Bio: J. W. Edington is an academic researcher from University of Cambridge. The author has contributed to research in topics: Superplasticity & Aluminium. The author has an hindex of 16, co-authored 28 publications receiving 954 citations. Previous affiliations of J. W. Edington include University of Delaware.
Papers
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TL;DR: In this paper, a coherent phase boundary position and the δ′ solvus have been defined in the vicinity of the phase boundary, and the low misfit δ-3Li invariably forms during quench from the solution treatment temperature, and its coarsening characteristics in the temperature range 140-200°C have been described.
Abstract: Transmission electron microscopy has been used to study δ′ (Al3Li) precipitation in Al–7·8, 10·7, and 12·9 at.-%Li alloys. The δ′ ageing behaviour in the vicinity of its solvus has been accounted for by the presence of a hitherto unreported coherent phase boundary. Both this boundary position and the δ′ solvus have been defined. In all alloys the low misfit δ′ invariably forms during the quench from the solution treatment temperature, and its coarsening characteristics in the temperature range 140–200°C have been described.
206 citations
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.
Abstract: Superplastic behaviour in torsion was first reported by Saveur [2] Pearson [3] first presented detailed observations of tensile superplasticity.
154 citations
TL;DR: In this paper, the first observation of a discontinuous reaction in dilute Al-Li alloys is reported, where a pre-existing dispersion of fine precipitates is converted to lamellae at the reaction front so that it is essentially a coarsening process.
88 citations
TL;DR: In this paper, the physical basis of microanalysis using measurements of electron energy losses associated with atom ionization or plasmon excitation in thin electron microscope specimens is explained in a simple manner.
Abstract: SUMMARY
The physical basis of microanalysis using measurements of electron energy losses associated with atom ionization or plasmon excitation in thin electron microscope specimens is explained in a simple manner. In addition the equipment used to resolve both the high and low energy regions of the loss electron spectrum is described. It is shown that ionization loss analysis is still in its infancy, but plasmon loss analysis has now been providing quantitative microanalytical data on light metal alloys for 8 years. The results obtained from both techniques and their application to specific metallurgical problems are reviewed. Conclusions are drawn concerning the future use of these techniques in high resolution microanalysis.
63 citations
TL;DR: In this article, the texture changes can be interpreted in terms of grain boundary sliding, dislocation motion and diffusion creep in the Al-33 wt% Cu eectic alloy.
55 citations
Cited by
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15 Nov 1997-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: The current understanding of the fundamentals of recrystallization is summarized in this paper, which includes understanding the as-deformed state, nucleation and growth, the development of misorientation during deformation, continuous, dynamic, and geometric dynamic recystallization, particle effects, and texture.
Abstract: The current understanding of the fundamentals of recrystallization is summarized. This includes understanding the as-deformed state. Several aspects of recrystallization are described: nucleation and growth, the development of misorientation during deformation, continuous, dynamic, and geometric dynamic recrystallization, particle effects, and texture. This article is authored by the leading experts in these areas. The subjects are discussed individually and recommendations for further study are listed in the final section.
1,797 citations
TL;DR: 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.
1,307 citations
TL;DR: In this paper, a compilation of non-irradiated and irradiated properties of SiC are provided and reviewed and analyzed in terms of application to TRISO fuels, specifically in the high-temperature irradiation regime.
1,106 citations
TL;DR: In this paper, the grain structure, dislocation density and second phase particles in various regions including the dynamically recrystallized zone (DXZ), thermo-mechanically affected zone (TMAZ), and heat-affected zone (HAZ) of a friction stir weld aluminum alloy 7050-T651 were investigated and compared with the unaffected base metal.
934 citations
TL;DR: In this article, a constitutive equation based on these experimental results that includes flow laws for these four creep mechanisms is described. But this equation is in excellent agreement with published laboratory creep data for coarse-grained samples at high temperatures.
Abstract: Creep experiments on fine-grained ice reveal the existence of three creep regimes: (1) a dislocation creep regime; (2) a superplastic flow regime in which grain boundary sliding is an important deformation process; and (3) a basal slip creep regime in which the strain rate is limited by basal slip. Dislocation creep in ice is likely climb-limited, is characterized by a stress exponent of 4.0, and is independent of grain size. Superplastic flow is characterized by a stress exponent of 1.8 and depends inversely on grain size to the 1.4 power. Basal slip limited creep is characterized by a stress exponent of 2.4 and is independent of grain size. A fourth creep mechanism, diffusional flow, which usually occurs at very low stresses, is inaccessible at practical laboratory strain rates even for our finest grain sizes of approximately 3 micrometers. A constitutive equation based on these experimental results that includes flow laws for these four creep mechanisms is described. This equation is in excellent agreement with published laboratory creep data for coarse-grained samples at high temperatures. Superplastic flow of ice is the rate-limiting creep mechanism over a wide range of temperatures and grain sizes at stresses less than or equal to 0.1 MPa, conditions which overlap those occurring in glaciers, ice sheets, and icy planetary interiors.
608 citations