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Title: Toughening mechanisms in Al/Al-SiC laminated metal composites

Abstract

The fracture toughness of laminated metal composites consisting of alternating layers of a metal matrix composite (Al6090/SiC/25p) and a monolithic aluminum alloy (Al5182) has been studied as a function of the volume fraction of the component materials. Finite element simulations of the fracture toughness tests have been used to study the mechanisms of crack growth and extrinsic toughening. The mechanisms responsible for toughening in laminated metal composites are described.

Authors:
; ; ;  [1];  [2];  [3]
  1. Lawrence Livermore National Lab., CA (United States)
  2. Case Western Reserve Univ., Cleveland, OH (United States)
  3. Alcoa Technical Center, Alcoa Center, PA (United States)
Publication Date:
OSTI Identifier:
490776
Report Number(s):
CONF-960401-
ISBN 1-55899-337-1; TRN: IM9729%%27
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Book
Resource Relation:
Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996; Other Information: PBD: 1996; Related Information: Is Part Of Layered materials for structural applications; Lewandowski, J.J. [ed.] [Case Western Reserve Univ., Cleveland, OH (United States)]; Ward, C.H. [ed.] [Air Force Office of Scientific Research, Bolling AFB, DC (United States)]; Jackson, M.R. [ed.] [General Electric Corporate R and D, Schenectady, NY (United States)]; Hunt, W.H. Jr. [ed.] [Alcoa Technical Center, Alcoa Center, PA (United States)]; PB: 325 p.; Materials Research Society symposium proceedings, Volume 434
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FRACTURE PROPERTIES; ALUMINIUM BASE ALLOYS; SILICON CARBIDES; COMPOSITE MATERIALS; LAYERS; CONCENTRATION RATIO; SIMULATION; FINITE ELEMENT METHOD; CRACK PROPAGATION; INTERFACES; EXPERIMENTAL DATA

Citation Formats

Lesuer, D.R., Wadsworth, J., Riddle, R.A., Syn, C.K., Lewandowski, J.J., and Hunt, W.H. Jr. Toughening mechanisms in Al/Al-SiC laminated metal composites. United States: N. p., 1996. Web.
Lesuer, D.R., Wadsworth, J., Riddle, R.A., Syn, C.K., Lewandowski, J.J., & Hunt, W.H. Jr. Toughening mechanisms in Al/Al-SiC laminated metal composites. United States.
Lesuer, D.R., Wadsworth, J., Riddle, R.A., Syn, C.K., Lewandowski, J.J., and Hunt, W.H. Jr. 1996. "Toughening mechanisms in Al/Al-SiC laminated metal composites". United States. doi:.
@article{osti_490776,
title = {Toughening mechanisms in Al/Al-SiC laminated metal composites},
author = {Lesuer, D.R. and Wadsworth, J. and Riddle, R.A. and Syn, C.K. and Lewandowski, J.J. and Hunt, W.H. Jr.},
abstractNote = {The fracture toughness of laminated metal composites consisting of alternating layers of a metal matrix composite (Al6090/SiC/25p) and a monolithic aluminum alloy (Al5182) has been studied as a function of the volume fraction of the component materials. Finite element simulations of the fracture toughness tests have been used to study the mechanisms of crack growth and extrinsic toughening. The mechanisms responsible for toughening in laminated metal composites are described.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1996,
month =
}

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  • A constitutive model for deformation of a novel laminated metal composite (LMC) which is comprised of 21 alternating layers of Al 5182 alloy and Al 6090/SiC/25p metal matrix composite (MMC) has been proposed. The LMC as well as the constituent or neat structures have been deformed in uniaxial tension within a broad range of strain-rates (i.e., 10{sup {minus}5} to 10{sup 0}s{sup {minus}1}) and homologous temperatures (i.e., 0.8 {ge} 0.95 T{sub m}). The results of these experiments have led to a thorough characterization of the mechanical behavior and a subsequent semiempirical constitutive rate equation for both the Al 5182 and Almore » 6090/SiC/25p when tested monolithically. These predictive relations have been coupled with a proposed model which takes into account the dynamic load sharing between the elastically stiffer and softer layers when loaded axially during isostrain deformation of the LMC. This model has led to the development of a constitutive relationship between flow stress and applied strain-rate for the laminated structure.« less
  • The present work discusses such metal matrix composite (MMC)-related issues as strengthening mechanisms, mechanical properties, fracture and fatigue behavior, and physical and chemical properties. Attention is given to plasticity theories for fiber-reinforced composites, the strengthening of MMCs by dislocation-generation through coefficient of thermal expansion mismatch, the strengthening behavior of in situ composites, the tensile and compressive properties of MMCs, and the mechanical behavior of MMCs under high strain rates and impact loadings. Also discussed are the creep behavior of MMCs, the fracture toughness of particulate-reinforced MMCs, the fatigue of continuously-reinforced MMCs, the dynamic mechanical properties of MMCs, and the electricalmore » conductivity and thermal expansion of MMCs.« less
  • Previous studies revealed that damping capacity of Al alloys can be improved through particle reinforced metal matrix composite (MMC) processing. Addition of graphite particles may produce a substantial increase in damping capacity but introduce a decrease in modulus. Addition of SiC particles, however, improves modulus while maintaining a comparable or slightly superior damping capacity to that of matrix alloys. Considering the very different effects of graphite and SiC particles on the properties of Al alloys, SiC and graphite particle hybrid reinforced 6061 Al MMCs (6061Al/SiC/Gr) were fabricated using a spray deposition technique in an effort to develop a high dampingmore » and high modulus material. Two ratios of SiC to graphite particle volumes were used to explore optimal combination of damping and modulus of the hybrid MMCS. Both damping capacity and storage modulus were evaluated on a dynamic mechanical thermal analyzer. Experimental results showed that the 6061Al/SiC/Gr hybrid MMCs exhibited a higher damping than the 6061/SiC and a higher modulus than 6061/Gr MMCs with similar volume fraction of reinforcement. The operative damping mechanisms are discussed on the basis of microstructural analyses. The improvement in damping capacity of the hybrid MMCs is discussed in terms of microstructural modification in the matrix and generation of interfaces due to the presence of SiC and graphite particles.« less
  • This book presents studies on the mechanisms of fracture in ceramic materials-the effects of toughening, machining, and shock. Research on toughening mechanisms, machining and surface damage, thermal shock and general aspects of fracture in ceramic materials is described. Quantitative models of the various fracture processes have been developed. Special emphasis has been placed on the toughening that occurs in the presence of microcracks. During the last decade, research on the fracture of monolithic single phase and multiphase ceramic polycrystals has attained a maturity which now permits many fracture phenomena to be quantitatively described. Specifically, the predominant fracture initiating flaws havemore » been identified and the fundamental mechanics and statistics related to their fracture severity have been determined. In addition, the crack growth resistance exhibited by common ceramic microstructures can now be expressed in quantitative terms, through the development of micromechanics models of transformation toughening, microcrack toughening, and deflection toughening.« less
  • The crack growth behavior and fracture toughness of two laminated metal composites (6090/SiC/25p laminated with 5182 and ultrahigh-carbon steel laminated with brass) have been studied in both ``crack arrester`` and ``crack divider`` orientations. The mechanisms of crack growth were analyzed and extrinsic toughening mechanisms were found to contribute significantly to the toughness. The influence of laminate architecture (layer thickness and component volume function), component material properties and residual stress on these mechanisms and the resulting crack growth resistance are discussed.