Extrusion of AlSi/SiCp composite alloys in the semi-solid state
- Ecole Polytechnique, Montreal, Quebec (Canada). Dept. de Metallurgie et de Genie des Materiaux
- Conseil National de Recherche Canada, Boucherville, Quebec (Canada). Inst. des materiaux Industriels
Semi-solid A356 alloys with 15 vol % SiC particles (10--15{micro}m) were extruded through cylindrical dies of variable dimension in order to evaluate the resistance to extrusion of these composites. The samples were first prepared by isothermal mixing in the semi-solid state for controlled periods of time and shear rates in order to obtain 20, 30 and 40 vol% primary fraction of the alloy ({alpha}-aluminum) generating a consistent globular-agglomerated structure. The quenched samples were introduced into the die chamber of a computer controlled extrusion press where the temperature was again raised to the semi-solid state and then extruded at a constant rate. Extrusions were carried out to evaluate the effect of extrusion rate, die length and diameter and variable solid fraction. All examples exhibited a sharp rise in extrusion force, and then reaching a plateau for the duration of the extrusion. Die entrance resistance was found to be the predominant force measured. Analysis of sections of the extruded material showed that the primary phase particles are deformed axially along the extrusion direction resulting in a non-isotropic structure with increased tensile strength and ductility.
- OSTI ID:
- 109757
- Report Number(s):
- CONF-950521--; ISBN 1-56676-313-4
- Country of Publication:
- United States
- Language:
- English
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