ISSN:
1013-9826
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:
An experimental study of microstructure and mechanical properties in the Al2O3particulate reinforced 6061 Aluminum composites has been used to determine the effect ofextrusion and particle volume fraction (20, 26, 30, 40, 50, 60%Vf) in deformed metal matrixcomposites. The microstructure of Al2O3 /6061Al composite before and after hot extrusion isinvestigated by TEM and SEM. Results show that dislocation and subgrain generated after hotextrusion as well as the particle distribution of composite become more uniform with extrusion ratioof 10:1. The ultimate strength, yield strength and elongation of the composite also increase after hotextrusion. Dispersion strengthening and subgrain boundary strengthening is discussed and also theeffect of precipitate introduced by heat treatment both after casting and after extrusion. The yieldstress (0.2% offset) of the composites has been calculated and predicted using a standard dislocationhardening model. Whilst the correlation between this and the measured value of yield stressobtained in previous experimental test is reasonable
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1390.pdf
