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Effect of extrusion parameters on structure and properties of 2124 aluminum alloy matrix composites

DSpace at IIT Bombay

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Title Effect of extrusion parameters on structure and properties of 2124 aluminum alloy matrix composites
 
Creator PRASAD, VVB
BHAT, BVR
MAHAJAN, YR
RAMAKRISHNAN, P
 
Subject cast
2124 aluminum
dra composites
elastic modulus
extrusion
extrusion ratio
matrix
matrix stringers
necklace structure
powder metallurgy
ram speed
reinforcement
silicon carbide
tensile strength
vacuum hot pressing
 
Description Discontinuously reinforced aluminum matrix composites (DRA) have been attracting attention because of their amenability to undergo deformation processing by conventional metalworking techniques. Extrusion is used in processing of DRA composites for consolidation, redistribution of reinforcements, and shape forming. The important parameters that control the extrusion process are temperature and strain rate, which is a function of several equipment/extrusion parameters. Vacuum hot-pressed (VHP) 2124 Al/30 SiCP composite billets were extruded at different ram speeds (1, 10, 100 mm sec(-1)) and using different extrusion ratios (4: 1, 10: 1, and 20: 1). The extruded samples were studied for their integrity, microstructure, and mechanical properties. The integrity of the extruded composite rod was very good at minimum extrusion speed of 1 mm sec(-1), whereas 100 mm sec(-1) extrusion speed resulted in extensive fir tree cracking. Extrusion of VHP billets, with necklace structure, resulted in elongated alternate stringers of matrix and SiCp in the extrusion direction. Matrix stringer width and aspect ratio were found to vary with extrusion ratio. Because of the microstructural refinement, both the strength and ductility of the metal matrix composites (MMCs) were improved. Microhardness of the matrix stringers was found to be a function (power relation) of their width, irrespective of the location and extrusion ratio.
 
Publisher MARCEL DEKKER INC
 
Date 2011-08-18T09:22:18Z
2011-12-26T12:55:40Z
2011-12-27T05:41:58Z
2011-08-18T09:22:18Z
2011-12-26T12:55:40Z
2011-12-27T05:41:58Z
2001
 
Type Article
 
Identifier MATERIALS AND MANUFACTURING PROCESSES, 16(6), 841-853
1042-6914
http://dx.doi.org/10.1081/AMP-100108703
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9958
http://hdl.handle.net/10054/9958
 
Language en