Journal ArticleDOI
Constraints on the diffusive cavitation of isolated grain boundary facets in creeping polycrystals
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In this paper, the authors considered the diffusive cavitation of grain facets in circumstances for which the cavitated facets are well separated from one another, and showed that the rupture time tr, is given by the sum of two terms, one proportional to 1 Dσ ∞ (where D is the grain boundary diffusion parameter and σ∞ the stress which would act on a non-cavitated facet) and another proportional to E ∞(here E∞ is the creep rate of a similarly loaded polycrystal with uncavitated boundaries).About:
This article is published in Acta Metallurgica.The article was published on 1981-04-01. It has received 224 citations till now. The article focuses on the topics: Grain boundary diffusion coefficient & Grain boundary.read more
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Book ChapterDOI
Material Failure by Void Growth to Coalescence
TL;DR: In this paper, a convected coordinate formulation of the field equations is used to describe the material failure by coalescence of microscopic voids, and a detailed micromechanical study of shear band bifurcation that accounts for the interaction between neighboring voids and the strongly nonhomogeneous stress distributions around each void has been carried out, and also elaborated in this chapter.
Journal ArticleDOI
Creep cavitation in metals
Michael E. Kassner,T.A. Hayes +1 more
TL;DR: A review of the state-of-the-art of the understanding of cavity formation during stages I and II (primary and secondary) creep in polycrystalline metals and alloys, particularly at elevated temperatures, can be found in this article.
Journal ArticleDOI
Fundamental Research in Structural Ceramics for Service Near 2000°C
TL;DR: In this paper, the authors present five themes for fundamental research and design of high-temperature structural ceramics: chemical and environmental stability, grain-boundary sliding and cavitation, single-crystal micro-structure design, room-time temperature mechanical properties, and thermal shock.
Journal ArticleDOI
Diffusive growth of grain-boundary cavities
I-Wei Chen,A.S. Argon +1 more
TL;DR: In this article, a simple theoretical approach to the general problem of diffusive growth of grain boundary cavities of both equilibrium and non-equilibrium shape in the presence of power law creep is developed.
Journal ArticleDOI
Constitutive behavior and crack tip fields for materials undergoing creep-constrained grain boundary cavitation
TL;DR: In this article, a phenomenological constitutive law for the steady creep of polycrystalline materials undergoing creep-constrained grain boundary cavitation is proposed based on micro-mechanical considerations.
References
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Journal ArticleDOI
The growth of grain-boundary voids under stress
D. Hull,D. E. Rimmer +1 more
TL;DR: In this paper, the effect of combined hydrostatic pressure, P, and of uniaxial tension, [sgrave], on the rupture time of polycrystalline copper wire in the temperature range 400° to 500°c was determined.
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
Plastic creep flow effects in the diffusive cavitation of grain boundaries
Alan Needleman,James R. Rice +1 more
TL;DR: In this article, the growth of cavities along grain interfaces was analyzed by the combined processes of grain boundary diffusion and plastic dislocation creep in the adjoining grains, and it was shown that the coupling between the processes can be expressed in terms of a parameter L, which has the dimensions of length and which is a function of material properties, temperature and applied stress.
Journal ArticleDOI
Overview no. 2
TL;DR: In this article, the authors compare the quasi-equilibrium model to another limiting case based on a narrow, crack-like cavity shape, and show that for circular cavities on a grain boundary with diameter equal to a quarter of their average center-to-center spacing, the quasi equilibrium mode applies when s Δ and the cracklike mode when s > 2 + 9 Δ, where Δ is the ratio of surface to grain boundary diffusivity.
Journal ArticleDOI
Constraints on diffusional cavity growth rates
TL;DR: In this article, it is shown that a constraint on growth rate can occur in polycrystals because creep cavities are inhomogeneously distributed amongst the various grain boundaries, and that the rate of unconstrained cavity growth is directly proportional to the maximum principal tensile stress, whereas constrained growth is proportional to nth power of the octahedral shear stress.