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Title: Development of an in-situ multi-component reinforced Al-based metal matrix composite by direct metal laser sintering technique — Optimization of process parameters

In the present investigation, an in-situ multi-component reinforced aluminum based metal matrix composite was fabricated by the combination of self-propagating high-temperature synthesis and direct metal laser sintering process. The different mixtures of Al, TiO{sub 2} and B{sub 4}C powders were used to initiate and maintain the self-propagating high-temperature synthesis by laser during the sintering process. It was found from the X-ray diffraction analysis and scanning electron microscopy that the reinforcements like Al{sub 2}O{sub 3}, TiC, and TiB{sub 2} were formed in the composite. The scanning electron microscopy revealed the distribution of the reinforcement phases in the composite and phase identities. The variable parameters such as powder layer thickness, laser power, scanning speed, hatching distance and composition of the powder mixture were optimized for higher density, lower porosity and higher microhardness using Taguchi method. Experimental investigation shows that the density of the specimen mainly depends upon the hatching distance, composition and layer thickness. On the other hand, hatching distance, layer thickness and laser power are the significant parameters which influence the porosity. The composition, laser power and layer thickness are the key influencing parameters for microhardness. - Highlights: • The reinforcements such as Al{sub 2}O{sub 3}, TiC, and TiB{sub 2} weremore » produced in Al-MMC through SHS. • The density is mainly influenced by the material composition and hatching distance. • Hatching distance is the major influencing parameter on porosity. • The material composition is the significant parameter to enhance the microhardness. • The SEM micrographs reveal the distribution of TiC, TiB{sub 2} and Al{sub 2}O{sub 3} in the composite.« less
Authors:
 [1] ; ;  [2]
  1. Department of Mechanical Engineering, National Institute of Technology Agartala, Tripura 799055 (India)
  2. Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302 (India)
Publication Date:
OSTI Identifier:
22340380
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 93; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; ALUMINIUM OXIDES; DENSITY; LASERS; MICROHARDNESS; MICROSTRUCTURE; MIXTURES; POROSITY; POWDERS; SCANNING ELECTRON MICROSCOPY; SINTERING; SYNTHESIS; THICKNESS; TITANIUM BORIDES; TITANIUM CARBIDES; TITANIUM OXIDES; X-RAY DIFFRACTION