Relaxation of thermal mismatch in discontinuously reinforced composites

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We have measured the dislocation density vol % and thermal residual elastic strain in NiAl matrices of 20 vol % Al{sub 2}O{sub 3} discontinuously-reinforced composites. As the size of the reinforcement increases the average dislocation density increases, and the corresponding thermal residual elastic strains decrease. The changes with respect to particle size in the dislocation density and residual strain can neither be explained by continuum theory nor by dislocation mechanics for homogeneous medium. A previously developed model (that satisfactorily describes the SiC/Al system) suggests that the misfit dislocation density decreases with increase in reinforcement size but this disagrees wit the ... continued below

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5 p.

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Shi, N.; Bourke, M.A.M.; Goldstone, J.A. & Arsenault, R.J. August 1, 1995.

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Description

We have measured the dislocation density vol % and thermal residual elastic strain in NiAl matrices of 20 vol % Al{sub 2}O{sub 3} discontinuously-reinforced composites. As the size of the reinforcement increases the average dislocation density increases, and the corresponding thermal residual elastic strains decrease. The changes with respect to particle size in the dislocation density and residual strain can neither be explained by continuum theory nor by dislocation mechanics for homogeneous medium. A previously developed model (that satisfactorily describes the SiC/Al system) suggests that the misfit dislocation density decreases with increase in reinforcement size but this disagrees wit the current Al{sub 2}O{sub 3}/NiAl results. A new model is proposed to describe low-symmetry intermetallics, which are constrained in their ability to relax thermal mismatch because of a paucity of independent slip systems. The results are discussed in the context of continuum mechanics using finite element analyses and crystal plasticity.

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5 p.

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OSTI as DE95016802

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  • TMS symposium on micromechanics of advanced materials, Cleveland, OH (United States), Nov 1995

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  • Other: DE95016802
  • Report No.: LA-UR--95-2271
  • Report No.: CONF-9511116--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 100321
  • Archival Resource Key: ark:/67531/metadc626487

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  • August 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • March 1, 2016, 1:37 p.m.

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Shi, N.; Bourke, M.A.M.; Goldstone, J.A. & Arsenault, R.J. Relaxation of thermal mismatch in discontinuously reinforced composites, article, August 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc626487/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.