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Title: Effect of deformation temperature on the mechanical behavior and deformation mechanisms of Al-Al[sub 2]O[sub 3] metal matrix composites

Abstract

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 nucleationmore » of recrystallization. No direct relationship was established as far as the number of grains nucleated due to each reinforcement particle.« less

Authors:
 [1]
  1. American Univ. in Cairo (Egypt). Dept. of Engineering
Publication Date:
OSTI Identifier:
6383622
Resource Type:
Journal Article
Journal Name:
Journal of Materials Engineering and Performance
Additional Journal Information:
Journal Volume: 8:4; Journal ID: ISSN 1059-9495
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 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; 360600* - Other Materials

Citation Formats

Mazen, A A. Effect of deformation temperature on the mechanical behavior and deformation mechanisms of Al-Al[sub 2]O[sub 3] metal matrix composites. United States: N. p., 1999. Web. doi:10.1361/105994999770346819.
Mazen, A A. Effect of deformation temperature on the mechanical behavior and deformation mechanisms of Al-Al[sub 2]O[sub 3] metal matrix composites. United States. https://doi.org/10.1361/105994999770346819
Mazen, A A. 1999. "Effect of deformation temperature on the mechanical behavior and deformation mechanisms of Al-Al[sub 2]O[sub 3] metal matrix composites". United States. https://doi.org/10.1361/105994999770346819.
@article{osti_6383622,
title = {Effect of deformation temperature on the mechanical behavior and deformation mechanisms of Al-Al[sub 2]O[sub 3] metal matrix composites},
author = {Mazen, A A},
abstractNote = {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.},
doi = {10.1361/105994999770346819},
url = {https://www.osti.gov/biblio/6383622}, journal = {Journal of Materials Engineering and Performance},
issn = {1059-9495},
number = ,
volume = 8:4,
place = {United States},
year = {Sun Aug 01 00:00:00 EDT 1999},
month = {Sun Aug 01 00:00:00 EDT 1999}
}