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Synthesis of MMC using spray atomization and co-deposition
MANUFACTURE OF ALUMINIUM-BASE MMC BY VACUUM HOT P R E S S I N G J.H. Tweed, (AEA Industrial Technology, Harwell UK). The p r o d u c t i o n of specimens of SiC particle reinforced alloys, with controlled microstructures, for use as non-destructive testing s t a n d a r d s was described. A1 2014 with 600grit SiC and Al 8090 with 1200grit were used as model materials. Vacuum hot pressing was used as the consolidation technique and billets with 0 to 40 vol% SiC and 0 to 10% porosity were made. Thermal conductivities and evolution of gases during degassing were m e a s u r e d a n d m o d e l l e d as a f u n c t i o n of c o l d pressing. Pressing rates were related to %SiC and sub-and super-solidus conditions during processing. INVESTIGATION OF FORGED COMPONENTS MADE FROM AN ALUMINIUM ALLOY REINFORCED WITH SILICON CARBIDE PARTICLES C. Carre et al., (Aerospatiale, Suresnes, France). The a p p l i c a t i o n of forged h e l i c o p t e r p a r t s m a d e from Al alloy X2090 reinforced with 15% SiC particles was reviewed in t e r m s of the potential for weight saving. The optimization of process conditions, results of evaluation tests and cost analysis were discussed. FABRICATION OF ALUMINIUM MATRIX COMPOSITES USING VACUUM PLASMA SPRAYING A. Salito et al., ( P l a s m a - T e c h n i k AG, W6hlen, Switzerland). The p a p e r described the fabrication of small m o n o t a p e s and preforms by spraying t h e m a t r i x A l - b a s e alloy on to t h e r e i n f o r c e m e n t fibre m a t e r i a l to o b t a i n small billets. The specimens were evaluated by microscopy and mechanical property tests and the effects of process
60 MPR March 1992
conditions on these were discussed. PRODUCTION STRUCTURES PROPERTIES REINFORCED PARTICLES
TECHNIQUES AND MECHANICAL OF MAGNESIUM ALLOYS WITH SILICON CARBIDE
J. SchrSder et al. (Zentrum ffir Funktionwerkstoffe GmbH, Clausthal, Germany). The use of SiC particles, in the range 5 to 30 vol%, to r e i n f o r c e Mg alloys w a s d i s c u s s e d . The m e c h a n i c a l p r o p e r t i e s , stiffness and wear resistance were reported to be improved by the reinforcements. Alloys tested and or which results were reported were AZ91 and QE22. The effects of process variables on particle distribution, microstructure and mechanical p r o p e r t i e s were investigated and discussed. DEVELOPMENT MANUFACTURE AND PROPERTIES OF ALUMINIUM-BASE MMC A.R. Begg, (BP Metal C o m p o s i t e s Ltd, Farnborough, UK). The p a p e r reviewed the methods, stir casting, co-spraying and PM, of preparing MMCs and the properties of the materials m a d e by t h e t h r e e m e t h o d s , PM was considered to give the best properties but at increased cost and to be t h e m o s t suitable for aerospace applications. Data concerning properties of a range of alloys with differing levels of reinforcement were p r e s e n t e d and discussed. PRODUCTION OF LIGHT ALLOYS AND COMPOSITES BY MEANS OF THE OSPREY PREFORM PROCESS L.G. Elias et al, (Osprey Metals Ltd, Neath, Glamorgan, UK). A description was given of the Osprey process for the production of light alloys and MMCs in the form of semi-finished shapes. Comparison was made with
c o n v e n t i o n a l PM. The t e c h n i q u e w a s r e p o r t e d to h a v e b e e n u s e d in t h e d e v e l o p m e n t of new alloy c o m p o s i t i o n s and results were p r e s e n t e d for novel high s t r e n g t h a n d high t e m p e r a t u r e alloys, hypereutectic A1-Si alloys and MMCs. The current state of development and future possibilities were outlined. SYNTHESIS OF MMC USING SPRAY ATOMIZATION AND CO-DEPOSITION E.J. Lavernia, (University of California, Irvine, California, USA). The application of spray atomization and co-deposition of MMC was reviewed and a description of the process was given. The use of single a n d multiple j e t to construct predetermined atomization geometry and microstructures was discussed. The technique was r e p o r t e d to be useful for difficult metals, highly reactive metals a n d high t e m p e r a t u r e materials which are difficult to deform as well as MMCs. The m e c h a n i c a l b e h a v i o u r a n d microstructures of s p r a y d e p o s i t e d materials were discussed as a function of process conditions, reinforcement distribution and alloy composition. The experimental results were c o m p a r e d with theoretical models. HIGH STRENGTH HIGH CONDUCTIVITY COPPER ALLOYS AND COMPOSITES PRODUCED BY SPRAY DEPOSITION D.G. Morris and C. Biselli, (University of Neuch~tel, Switzerland). An investigation into the use of the Osprey process for the p r o d u c t i o n of Cubase alloys and composites was described. Thermo-mechanical processing was used to ensure o p t i m u m electrical conductivity and strength. A sample of an alloy with fibre was m a d e by spray deposition nd extensive deformation. Rapid solidification was considered to be essential to ensure a fine and uniform initial microstructure.
60 MPR March 1992
conditions on these were discussed. PRODUCTION STRUCTURES PROPERTIES REINFORCED PARTICLES
TECHNIQUES AND MECHANICAL OF MAGNESIUM ALLOYS WITH SILICON CARBIDE
J. SchrSder et al. (Zentrum ffir Funktionwerkstoffe GmbH, Clausthal, Germany). The use of SiC particles, in the range 5 to 30 vol%, to r e i n f o r c e Mg alloys w a s d i s c u s s e d . The m e c h a n i c a l p r o p e r t i e s , stiffness and wear resistance were reported to be improved by the reinforcements. Alloys tested and or which results were reported were AZ91 and QE22. The effects of process variables on particle distribution, microstructure and mechanical p r o p e r t i e s were investigated and discussed. DEVELOPMENT MANUFACTURE AND PROPERTIES OF ALUMINIUM-BASE MMC A.R. Begg, (BP Metal C o m p o s i t e s Ltd, Farnborough, UK). The p a p e r reviewed the methods, stir casting, co-spraying and PM, of preparing MMCs and the properties of the materials m a d e by t h e t h r e e m e t h o d s , PM was considered to give the best properties but at increased cost and to be t h e m o s t suitable for aerospace applications. Data concerning properties of a range of alloys with differing levels of reinforcement were p r e s e n t e d and discussed. PRODUCTION OF LIGHT ALLOYS AND COMPOSITES BY MEANS OF THE OSPREY PREFORM PROCESS L.G. Elias et al, (Osprey Metals Ltd, Neath, Glamorgan, UK). A description was given of the Osprey process for the production of light alloys and MMCs in the form of semi-finished shapes. Comparison was made with
c o n v e n t i o n a l PM. The t e c h n i q u e w a s r e p o r t e d to h a v e b e e n u s e d in t h e d e v e l o p m e n t of new alloy c o m p o s i t i o n s and results were p r e s e n t e d for novel high s t r e n g t h a n d high t e m p e r a t u r e alloys, hypereutectic A1-Si alloys and MMCs. The current state of development and future possibilities were outlined. SYNTHESIS OF MMC USING SPRAY ATOMIZATION AND CO-DEPOSITION E.J. Lavernia, (University of California, Irvine, California, USA). The application of spray atomization and co-deposition of MMC was reviewed and a description of the process was given. The use of single a n d multiple j e t to construct predetermined atomization geometry and microstructures was discussed. The technique was r e p o r t e d to be useful for difficult metals, highly reactive metals a n d high t e m p e r a t u r e materials which are difficult to deform as well as MMCs. The m e c h a n i c a l b e h a v i o u r a n d microstructures of s p r a y d e p o s i t e d materials were discussed as a function of process conditions, reinforcement distribution and alloy composition. The experimental results were c o m p a r e d with theoretical models. HIGH STRENGTH HIGH CONDUCTIVITY COPPER ALLOYS AND COMPOSITES PRODUCED BY SPRAY DEPOSITION D.G. Morris and C. Biselli, (University of Neuch~tel, Switzerland). An investigation into the use of the Osprey process for the p r o d u c t i o n of Cubase alloys and composites was described. Thermo-mechanical processing was used to ensure o p t i m u m electrical conductivity and strength. A sample of an alloy with fibre was m a d e by spray deposition nd extensive deformation. Rapid solidification was considered to be essential to ensure a fine and uniform initial microstructure.