Journal ArticleDOI
Cavitation during the superplastic deformation of an α/β brass
C. W. Humphries,N. Ridley +1 more
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In this paper, the authors studied cavitation during superplastic tensile flow in an α/β brass using metallography and precision density measurements and found that the level of cavitation increased as strain, strain rate and grain size were increased and as the temperature was decreased.Abstract:
Cavitation during superplastic tensile flow has been studied in anα/β brass using metallography and precision density measurements. Cavities nucleated primarily at triple points and were sometimes associated with small second phase particles. The level of cavitation increased as strain, strain rate and grain size were increased and as the temperature was decreased. The influence of these variables can be interpreted in terms of their effects on cavity nucleation and/or cavity growth rates.read more
Citations
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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
A model for diffusional cavity growth in superplasticity
TL;DR: In this paper, a model for the diffusion growth of cavities in superplastic materials was developed, and it was shown that the rate of change of cavity radius with strain due to super-plastic diffusion growth is given by drdϵ ∼- 45ΩδDgbd2kT(σe) where r is the cavity radius, e is the total strain, Ω is the atomic volume, Dgb is the coefficient for grain boundary diffusion, d is the spatial grain size, T is the absolute temperature, σ is the applied
Journal ArticleDOI
Cavity growth in superplastic alloys
TL;DR: In this paper, a model is developed to describe the growth of voids in superplastic alloys based on analyses by Hancock, Beere and Speight, and Edward and Ashby for the case of creep cavity growth controlled by plastic deformation of the matrix.
Journal ArticleDOI
Cavity growth during superplastic flow in an Al-Mg alloy: I. Experimental study
D.H. Bae,Amit K. Ghosh +1 more
TL;DR: In this paper, the authors evaluated the effect of superplastic straining of a fine-grained Al-Mg-Mn-Cu alloy under uniaxial tension.
Journal ArticleDOI
Failure of superplastic alloys
TL;DR: In this article, the authors focus on the dominating influence of cavitation damage in many superplastic materials, a feature which is attracting increasing interest because of its influence on the service behaviour of fabricated components.
References
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Journal ArticleDOI
Fracture of a superplastic ternary brass
S. Sagat,D. M. R. Taplin +1 more
TL;DR: In this article, the instability of plastic flow is analyzed in terms of the development of internal bifurcations (analogous to diffuse, multiple, external necks for non-cavitating superplastic alloys) and the linking of cavities by internal necking.
Journal ArticleDOI
Superplastic deformation and cavitation in a microduplex stainless steel
C. I. Smith,B. Norgate,N. Ridley +2 more
TL;DR: In this article, the superplastic deformation characteristics of a microduplex stainless steel were examined over the temperature range 700 −1020°C and the strain rate sensitivity index, m, was observed to increase with the temperature.
Journal ArticleDOI
Cavitation in alloy steels during superplastic deformation
C. W. Humphries,N. Ridley +1 more
TL;DR: In this article, a study of cavitation during superplastic tensile straining of two microduplex steels has been made using density measurements and quantitative optical metallography.