Results 271 to 280 of about 920,485 (301)

Mechanisms of melt extraction during lower crustal partial melting

Journal of Metamorphic Geology, 2020
AbstractProgressive vapour‐absent partial melting of a closed rock system increases melt pressure due to an expansion in the volume of the mineral plus melt assemblage. For a locally closed system, we quantify the melt pressure increase per increment of partial melting of a metapelite using phase equilibria modelling and combine it with Mohr–Coulomb ...
Michael A. Etheridge, Nathan R. Daczko, Timothy Chapman, Catherine A. Stuart   +3 more
openaire   +1 more source

Structure and Consolidation Properties of Some Melt Extracted Steels

MRS Proceedings, 1983
ABSTRACTA range of Fe-Mn and Fe-Ni steels have been processed by melt extraction to give fibres and particulate. The consolidation and sintering performance of these alloys are presented. Densities of up to 95% can be achieved with hardnesses in the range 400–500 Hv while possessing grain sizes less than 20μm.
J.V. Wood, C. Gagg
openaire   +1 more source

Physics of melt extraction: theory, implications and applications

Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences, 1993
Abstract This paper presents a general overview of flow in deformable porous media with emphasis on melt extraction processes beneath mid-ocean ridges. Using a series of simple model problems, we show that the equations governing magma migration have two fundamentally different modes of behaviour.
openaire   +1 more source

Permeability of asthenospheric mantle and melt extraction rates at mid-ocean ridges

Nature, 2009
Magmatic production on Earth is dominated by asthenospheric melts of basaltic composition that have mostly erupted at mid-ocean ridges. The timescale for segregation and transport of these melts, which are ultimately responsible for formation of the Earth's crust, is critically dependent on the permeability of the partly molten asthenospheric mantle ...
Connolly JA, Schmidt MW, Solferino G, Bagdassarov N   +3 more
openaire   +3 more sources

Melt extraction of short metallic filaments: Fibre formation process revisited

Journal of Materials Processing Technology, 2008
This article presents experimental results of the extraction of metallic fibres from the surface of a melt pool. A low-melting alloy was used in a model facility to produce filaments of equal length. Operational parameters such as wheel speed and feed rate were varied to yield thin fibres.
Cramer, A., Gerbeth, G.
openaire   +2 more sources

Melt extraction from the mantle beneath spreading centers

Earth and Planetary Science Letters, 1991
Abstract Melt migration beneath a mid-oceanic spreading center must be rapid and it must focus melt to the narrow ridge axis. Porous flow models that neglect compaction of the matrix result in vertical melt flow, and can not account for melt focussing. We show that dilation, or decompaction, of the porous matrix creates a high-porosity boundary layer,
David W. Sparks, E.M. Parmentier
openaire   +1 more source

Microstructure studies of melt-extracted Nd-Fe-B fibers

Journal of Magnetism and Magnetic Materials, 1992
Abstract The correlation between quenching conditions and microstructure of Nd-Fe-B fibers obtained by melt-extraction method has been studied. The structure of as-quenched fibers was observed by Scanning Electron Microscopy (SEM) on fracture cross section and by Transmission Electron Microscopy (TEM).
A. Zaluska, Z. Altounian, J.O. Ström-Olsen   +2 more
openaire   +1 more source

On the Origin of High-Alumina Arc Basalt and the Mechanics of Melt Extraction

Journal of Petrology, 1986
Most models of high-alumina arc basalt petrogenesis rely heavily on the supposition that the abundances of certain trace elements, in particular the relatively unfractionated Rare Earth Element (REE) patterns and the unusually high concentrations of K, Rb, Sr, and Ba are incompatible with a garnet-bearing subducted oceanic crustal (quartz eclogite ...
J. G. BROPHY, B. D. MARSH
openaire   +1 more source

The spatial and temporal patterning of the deep crust and implications for the process of melt extraction

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2010
Volumetrically significant melt production requires crustal temperatures above approximately 800°C. At the grain scale, the former presence of melt may be inferred based on various microstructures, particularly pseudomorphs of melt pores and grain-boundary melt films.
openaire   +2 more sources

A green method for extraction of Bi and Pb from bismuth-rich melt by super-gravity

Chemical Engineering Research and Design, 2020
Xiaochun Wen, Yiru Yang
exaly