Effect of deformation temperature on the mechanical behavior and deformation mechanisms of Al-Al[sub 2]O[sub 3] metal matrix composites
- American Univ. in Cairo (Egypt). Dept. of Engineering
Aluminum-alumina (Al-Al[sub 2]O[sub 3]) metal matrix composite (MMC) materials were fabricated using the powder metallurgy (PM) techniques of hot pressing followed by hot extrusion. Different reinforcement weight fractions were used, that is, 0, 2.5, 5, and 10 wt% Al[sub 2]O[sub 3]. The effect of deformation temperature was investigated through hot tensile deformation conducted at different temperatures. The microstructures of the tested specimens were also investigated to characterize the operative softening mechanisms. The yield and tensile strength of the Al-Al[sub 2]O[sub 3] were found to improve as a function of reinforcement weight fraction. With the exception of Al-10wt%Al[sub 2]O[sub 3], the MMC showed better strength and behavior at high temperatures than the unreinforced matrix. The uniform deformation range was found to decrease for the same reinforcement weight fraction, as a function of temperature. For the same deformation temperature, it increases as a function of reinforcement weight fraction. Both dynamic recovery and dynamic recrystallization were found to be operative in Al-Al[sub 2]O[sub 3] MMC as a function of deformation temperature. Dynamic recovery is dominant in the lower temperature range, while dynamic recrystallization is more dominant at the higher range. The increase in reinforcement weight fraction was found to lead to early nucleation of recrystallization. No direct relationship was established as far as the number of grains nucleated due to each reinforcement particle.
- OSTI ID:
- 6383622
- Journal Information:
- Journal of Materials Engineering and Performance, Vol. 8:4; ISSN 1059-9495
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM
ALUMINIUM OXIDES
COMPOSITE MATERIALS
CONCENTRATION RATIO
EXTRUSION
HOT PRESSING
MICROSTRUCTURE
POWDER METALLURGY
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
ELEMENTS
FABRICATION
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
METALLURGY
METALS
OXIDES
OXYGEN COMPOUNDS
PRESSING
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