An X-ray diffraction study on dislocation microstructure of as-prepared Al-Al2O3 composites

Microstructure of alpha-Al2O3 containing Al-based composites were studied in terms of ab initio quasi-composite model of dislocation cell structure and ellipsoidal log-normal distribution of crystallite size alpha-Al2O3, present in the composites, affects dislocation motion during stress relaxation...

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Published inActa materialia Vol. 52; no. 9; pp. 2755 - 2764
Main Authors DEB, A. K, CHATTERJEE, P, SEN GUPTA, S. P
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Science 17.05.2004
Subjects
Cross-disciplinary physics: materials science; rheology
Dispersion-, fiber-, and platelet-reinforced metal-based composites
Exact sciences and technology
Materials science
Other materials
Physics
Specific materials
Crystal defects
Metal matrix composite
Quasi-composite model
Dislocation structure
X-ray diffraction
Aluminium
XRD
Experimental study
Al Al2O3 composites
Dispersion strengthened metal
Dislocations
Dislocation cell
Microstructure
Alumina
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Abstract Microstructure of alpha-Al2O3 containing Al-based composites were studied in terms of ab initio quasi-composite model of dislocation cell structure and ellipsoidal log-normal distribution of crystallite size alpha-Al2O3, present in the composites, affects dislocation motion during stress relaxation at room temperature and may produce such a dislocation sub- structure. The region of high (about 8 x 10 exp 9/sq cm) and low (about 2 x 10 exp 9/sq cm) dislocation density has been characterized as cell walls and cell interiors, respectively, with compressive and tensile stresses, respectively, in accordance with the quasi-composite model. The results are in gross agreement with TEM studies.
AbstractList Microstructure of alpha-Al2O3 containing Al-based composites were studied in terms of ab initio quasi-composite model of dislocation cell structure and ellipsoidal log-normal distribution of crystallite size alpha-Al2O3, present in the composites, affects dislocation motion during stress relaxation at room temperature and may produce such a dislocation sub- structure. The region of high (about 8 x 10 exp 9/sq cm) and low (about 2 x 10 exp 9/sq cm) dislocation density has been characterized as cell walls and cell interiors, respectively, with compressive and tensile stresses, respectively, in accordance with the quasi-composite model. The results are in gross agreement with TEM studies.
Author CHATTERJEE, P
DEB, A. K
SEN GUPTA, S. P
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  fullname: SEN GUPTA, S. P
  organization: Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Keywords Crystal defects
Metal matrix composite
Quasi-composite model
Dislocation structure
X-ray diffraction
Aluminium
XRD
Experimental study
Al Al2O3 composites
Dispersion strengthened metal
Dislocations
Dislocation cell
Microstructure
Alumina
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SubjectTerms Cross-disciplinary physics: materials science; rheology
Dispersion-, fiber-, and platelet-reinforced metal-based composites
Exact sciences and technology
Materials science
Other materials
Physics
Specific materials
Title An X-ray diffraction study on dislocation microstructure of as-prepared Al-Al2O3 composites
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