Journal ArticleDOI
Cavitation behavior of an Al−Cu eutectic alloy during superplastic deformation
TLDR
In this article, the cavities were spherical in most cases, which was attributed to the diffusion-controlled cavity growth mechanism and its modification when the cavity size reaches the size of a grain.Abstract:
Cavitation behavior upon deformation of an Al−Cu eutectic alloy was studied by densitometry and quantitative microscopy. Tensile specimens were strained to different strain levels at constant strain rates and temperatures over the range of 10−5 to 10−2 s−1 and 400° to 540 °C, respectively. The cavity volume increased with increasing strain and strain rate but decreased with increasing temperature. The increase in cavity volume occurred through an increase in both the number and size of cavities. The cavities were spherical in most of the cases, which was attributed to the diffusion-controlled cavity growth mechanism and its modification when the cavity size reaches the size of a grain. The number and volume of cavities were used to evaluate the nature of the cavity nucleation rate and the level of pre-existing cavities.read more
Citations
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Journal ArticleDOI
Tensile ductility of superplastic ceramics and metallic alloys
TL;DR: In this paper, the tensile ductility of superplastic ceramics and metallic alloys was investigated and the authors showed that tensile deformation is not only a function of the strain-rate-sensitivity exponent, but also a factor of the parameter ⋗e exp (Qc/RT), where Qc is the steady-state strain rate and RT is the activation energy for super-plastic flow.
Journal ArticleDOI
Cavitation during grain-boundary-sliding deformation in an AZ61 magnesium alloy
TL;DR: In this article, a relatively coarse-grained AZ61 alloy deformed under two conditions for which grain-boundary sliding (GBS) creep controlled plastic flow and which produced the same flow stress of 10MPa.
Journal ArticleDOI
The characteristics of cavitation in superplastic metals and ceramics
Yan Ma,Terence G. Langdon +1 more
TL;DR: In this article, the size, shape, and configuration of internal cavities in superplastic metals and ceramics after deformation at high temperatures were investigated using a quantitative metallographic procedure and scanning video images.
Journal ArticleDOI
Experimental Investigation of Cavitation Behavior in AZ61 Magnesium Alloy
TL;DR: In this paper, the authors investigated the rate of cavitation with superplastic strain for a super-plastic AZ61 magnesium alloy at a strain rate of 2 × 10 - 4 s - 1 and temperature of 648 K, under the conditions of which an elongation of more than 250% has been found.
Journal ArticleDOI
Grain growth behaviour of the Al-Cu eutectic alloy during superplastic deformation
TL;DR: Grain growth behavior of the Al-Cu eutectic alloy was investigated as a function of strain (e), strain rate and deformation temperature (T) over as discussed by the authors, where grain size increases with increase in strain and temperature.
References
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Book
The theory of transformations in metals and alloys : an advanced textbook in physical metallurgy
Book
The theory of transformations in metals and alloys
J.W. Christian,H. M. Otte +1 more
TL;DR: In this paper, the authors present a general introduction to the theory of transformation kinetics of real metals, including the formation and evolution of martensitic transformations, as well as a theory of dislocations.
Journal ArticleDOI
Intergranular fracture at elevated temperature
Rishi Raj,M.F. Ashby +1 more
TL;DR: In this paper, the authors analyzed the kinetic problem of intergranular fracture at elevated temperatures by the nucleation and growth of voids in the grain boundary and calculated the time-to-fracture.
Journal ArticleDOI
Nucleation of cavities at second phase particles in grain boundaries
TL;DR: In this paper, a kinetic approach is used to explain the nucleation of cavities in grain boundaries at elevated temperature, under the influence of a tensile stress, vacancies cluster together and form cavities.
Journal ArticleDOI
Creep cavitation without a vacancy flux
TL;DR: In this paper, the authors compare the conditions under which hole growth without vacancy condensation is faster than hole growth by diffusion and show that low values of the ratio σ/e, where σ is stress and e is the strain rate, as well as large voids favour the strain process.
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