Patent
Fine grained metal composition
Reads0
Chats0
Abstract:
A fine grained metal composition suitable for forming in a partially solid, partially liquid condition. The composition is prepared by producing a solid metal composition having an essentially directional grain structure and heating the directional grain composition to a temperature above the solidus and below the liquidus to produce a partially solid, partially liquid mixture containing at least 0.05 volume fraction liquid. The composition, prior to heating, has a strain level introduced such that upon heating, the mixture comprises uniform discrete spheroidal particles contained within a lower melting matrix. The heated alloy is then solidified while in a partially solid, partially liquid condition, the solidified composition having a uniform, fine grained microstructure.read more
Citations
More filters
Journal ArticleDOI
Modelling the semisolid processing of metallic alloys
TL;DR: In this paper, a review of the state-of-the-art in computational fluid dynamics (CFD) can be found, which can be classified as one-phase or two-phase and finite difference or finite element.
Journal ArticleDOI
Recrystallisation in the semi-solid state in 7075 aluminium alloy
TL;DR: In this paper, the early stages of spheroid formation in 7075 aluminium alloy reheated from the as-supplied T6 condition were examined, and it was shown that on reheating the material to around 580°C (fraction of liquid ∼5%), a fully sphroidal microstructure can be obtained.
Journal ArticleDOI
Microstructural Coarsening of Semi-Solid Aluminium Alloys
Helen V. Atkinson,D. Liu +1 more
TL;DR: In this paper, the microstructural coarsening of semi-solid metal was compared with rates in the literature, and it is likely that relatively low coarsensing rates are associated with the presence of particles which are inhibiting the migration of liquid film grain boundaries, either through a pinning mechanism or through impeding diffusion through the liquid film at the boundary.
Journal ArticleDOI
Semisolid Metal Processing Techniques for Nondendritic Feedstock Production
TL;DR: The main aim of this paper is to classify the presently available SSM technologies and present a comprehensive review of the potential mechanisms that lead to microstructural alterations during the preparation of feedstock materials for SSM processing.
Journal ArticleDOI
Semisolid microstructure of Mg2Si/Al composite by cooling slope cast and its evolution during partial remelting process
TL;DR: In this paper, an in situ Mg 2 Si/Al/Si-Cu composite with semisolid structure was fabricated by cooling slope cast and partial remelting process and the as-cast microstructure, and effect of isothermal holding time on the morphology, size and shape factor of the grains were investigated.
References
More filters
Patent
Continuous process for forming an alloy containing non-dendritic primary solids
TL;DR: In this article, a process is provided for continuously forming a homogeneous mixture of a liquid-solid metal composition, wherein said solid comprises discrete degenerate dendrites or nodules, from a first metal composition which, when frozen from its liquid state without agitation forms a dendritic structure.
Patent
Composition and methods for preparing liquid-solid alloys for casting and casting methods employing the liquid-solid alloys
TL;DR: In this paper, a metal composition characterized by degenerate dendritic or nodular primary discrete solid particles suspended in a secondary phase having a lower melting point than the primary particles and which secondary phase can be solid or liquid.
Patent
Metal composition and methods for preparing liquid-solid alloy metal composition and for casting the metal compositions
R. Mehrabian,Merton C. Flemings +1 more
TL;DR: In this paper, a composite composition comprising a metallic matrix having a concentration of third phase solid particles homogeneously dispersed throughout the metallic matrix is presented. But the third phase particles can be metallic, non-metallic or a combination metallic-nonmetallic compositions and have a surface composition which is not wet by the metallic matrices.
Patent
Method for the preparation of thixotropic slurries
TL;DR: In this paper, an improved method for the preparation and delivery of semi-solid thixotropic metal slurries for use in metal forming processes such as the rheocast and thixocast processes is described.
Patent
Liquid-solid alloy composition
TL;DR: In this article, a metal composition characterized by degenerate dendritic or nodular primary discrete solid particles suspended in a secondary phase having a lower melting point than the primary particles and which secondary phase can be solid or liquid.