ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Aluminum alloys have been increasingly applied as a structural material incomposite materials using metal matrix due to their excellent mechanical properties and lowweight. The reinforcement are of fundamental importance in composite materials, owing tothe their responsibility to support stresses acting on the metal matrix. Therefore, ceramicreinforcements can be replaced by intermetallic components with high mechanical propertiesand good thermal stability. The intermetallic components react chemically with the matrix,characterized by strong interactions, which makes possible the development of the newfamilies of materials. The composite materials using aluminum reinforced with nickelaluminides and ceramic were developed using techniques based on a combination of powdermetallurgy and extrusion processes, which makes possible to obtain more dense materialsunder lower processing temperatures. The powders of AA6061 and Ni3Al were manuallymixed for 30 minutes, with different percentages of intermetallics and ceramics particles, 5and 10% in weight. The composite powders were submitted to a hot extrusion process for 40minutes at 540oC, and 385 MPa, with a reduction ratio of 25:1. This process insures extrudedcomposites with a refined structure and a good distribution of the reinforcement particles. Thematerial characterization were performed through structural analysis via scanning electronmicroscopy; mechanical behavior via tensile and hardening tests; and analysis of the fracture.The results show that the method used is effective to obtain composite materials withimproved characteristics
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.255.pdf
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