Journal ArticleDOI
Power-law creep of powder bonded by isolated contacts
TLDR
In this paper, the deformation of powder due to power-law creep near the interparticle contacts is modeled, where the plastic dissipation is dominated by the rate of approach of neighboring particles and the effect of tangential motion can be neglected.About:
This article is published in International Journal of Mechanical Sciences.The article was published on 1992-07-01. It has received 81 citations till now. The article focuses on the topics: Creep & Diffusion creep.read more
Citations
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Theory of sintering: from discrete to continuum
TL;DR: In this paper, a promising approach is connected with the use of continuum mechanics, which has been successfully applied to the analysis of compaction of porous bodies, based upon the theories of plastic and nonlinear-viscous deformation of porous body.
Journal ArticleDOI
Fundamental aspects of hot isostatic pressing: An overview
Helen V. Atkinson,S. Davies +1 more
TL;DR: In this paper, the basic science of sintering and hipping is summarized and contrasted, and the current state of understanding and modeling of hipping can be classified either as microscopic or macroscopic in their approach.
Journal ArticleDOI
The viscoplastic compaction of composite powders
TL;DR: In this article, a model for the densification of spherical powders is developed for the early stages of cold and hot compaction under general loading, and a general prescription is given for computing the macroscopic stress as a function of strain rate and accumulated strain.
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Overview no. 117 The structure of constitutive laws for the sintering of fine grained materials
TL;DR: In this article, the general structure of constitutive laws for the sintering of fine grained materials for situations where power-law creep and grain-boundary diffusion are the dominant mechanisms of deformation and densification is examined.
Journal ArticleDOI
On discrete element modelling of compaction of powders with size ratio
TL;DR: In this paper, a numerical procedure based on a discrete element method (DEM) for analyzing cold compaction of spherical powders is presented, followed by packing followed by compaction.
References
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Journal ArticleDOI
Hot isostatic pressing diagrams : new developments
TL;DR: In this paper, the equations and procedures for constructing hot-isostatic pressing diagrams are greatly simplified and clarified, and two further mechanisms are added: diffusional deformation of the particles themselves when the grain size is much smaller than the particle size, and the separation of pores from boundaries when grain growth occurs.
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The influence of an increasing particle coordination on the densification of spherical powders
TL;DR: In this article, the shape of the average cell is determined by the radial distribution function of a "random dense" packing of spheres, and the effects of an increasing coordination on densification by these mechanisms are assessed.
Journal ArticleDOI
Pressure sintering by power law creep
David Wilkinson,Michael F. Ashby +1 more
TL;DR: In this article, the contribution of power-law creep to the final stage densification of a powder compact is investigated, and it is modelled by considering the voids as spherical holes surrounded by a thick cylindrical shell of solid material which flow by power law creep.
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Practical applications of hotisostatic Pressing diagrams: Four case studies
TL;DR: In this paper, the construction of mechanism maps for hot-isostatic pressing is described, and a number of materials of commercial and scientific interest: tool steel, a superalloy, Al2O3, and ice.
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Yielding of metal powder bonded by isolated contacts
TL;DR: In this article, a macroscopic constitutive law for the plastic yielding of a random aggregate of perfectly plastic spherical metal particles is developed, and the results are considered valid for aggregates with densities ranging from about 60% to around 90% of the theoretical fully dense level.