Journal ArticleDOI
Microstructure of stir-cast metals
TLDR
The model of fragmentation due to the formation and subsequent melting of high energy grain boundaries is discussed and is shown to be compatible with a wide range of microstructural observations.About:
This article is published in Materials Science and Engineering.The article was published on 1984-07-01. It has received 190 citations till now. The article focuses on the topics: Grain boundary strengthening & Grain boundary.read more
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Semisolid metal processing
TL;DR: Semisolid metal processing is a relatively new method for forming alloys in the semisolid condition to near net shaped products as mentioned in this paper, which relies on the behaviour of semiscale slurries in which the solid exists in the form of spheroidal particles: if left undisturbed such slurries are stiff and may be handled, but flow like liquids on being sheared.
Journal ArticleDOI
Evolution of near-equiaxed microstructure in the semisolid state
TL;DR: In this paper, the microstructure of alloys with a near-equiaxed micro-structure, produced by spray casting, magnetohydrodynamic (MHD) casting and the stress induced, melt activated (SIMA) process, as it evolves within short times in the semisolid state, is examined by rapid quenching and isothermal soaking experiments.
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A synchrotron X-ray radiography study of dendrite fragmentation induced by a pulsed electromagnetic field in an Al–15Cu alloy
E. Liotti,A. Lui,Robin Vincent,S. Kumar,Zhipeng Guo,Thomas Connolley,I. P. Dolbnya,Michael Hart,Lars Arnberg,Ragnvald H. Mathiesen,Patrick S. Grant +10 more
TL;DR: An in situ technique for studying the effect of a pulsed electromagnetic field on dendrite fragmentation behavior based on synchrotron X-ray imaging has been developed, involving the passage of an oscillating current through a foil specimen placed in a static magnetic field as mentioned in this paper.
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Processing of Discontinuously-Reinforced Metal Matrix Composites by Rapid Solidification
TL;DR: A review of the literature on rapid solidification processing techniques for discontinuously-reinforced metal matrix composites is presented in this article, where the authors present a cross-section of techniques and experimental results obtained, in recent years, by numerous investigators.
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A Review on Grain Refinement of Aluminum Alloys: Progresses, Challenges and Prospects
Ren-Guo Guan,Di Tie +1 more
TL;DR: There have been a number of techniques for aluminum grain refining as mentioned in this paper, which can be classified as four categories as follows: grain refining by vibration and stirring during solidification, rapid solidification and severe plastic deformation.
References
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Journal ArticleDOI
Stability of a Planar Interface During Solidification of a Dilute Binary Alloy
W. W. Mullins,R. F. Sekerka +1 more
TL;DR: In this article, the stability of a moving planar liquid-solid interface during unidirectional freezing of a dilute binary alloy is theoretically investigated by calculating the time dependence of the amplitude of a sinusoidal perturbation of infinitesimal amplitude introduced into the planar shape.
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Morphological Stability of a Particle Growing by Diffusion or Heat Flow
W. W. Mullins,R. F. Sekerka +1 more
TL;DR: In this article, the stability of the shape of a phase boundary enclosing a particle whose growth during a phase transformation is regulated by the diffusion of material or the flow of heat is studied.
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Formation of Crystal Nuclei in Liquid Metals
TL;DR: In this paper, the authors calculated the interfacial energies between crystal nuclei and the corresponding liquids from nucleation frequencies of small droplets on the basis of homogeneous nucleation.
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The redistribution of solute atoms during the solidification of metals
TL;DR: In this article, a quantitative analysis of the redistribution of solute resulting from solidification in the absence of convection of a binary solution for transient and steady state conditions is made, where diffusion in the liquid is taken into account and shown to be of importance in determining the solute distribution in both the liquid and the solid.
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Diffusion-accommodated flow and superplasticity
M.F. Ashby,R. A. Verrall +1 more
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.