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Dislocation pile-up model for the yield stress of a composite
Department of Metallurgy, Indian Institute of Science, Bangalore.
Department of Metallurgy, Indian Institute of Science, Bangalore.
1999 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 47, no 5, p. 1635-1643Article in journal (Refereed) Published
Abstract [en]

A numerical model to simulate yielding in a composite is developed for the transmission of slip across a dissimilar interface through the formation of co-planar dislocation arrays in both phases. A pile-up of dislocations in the soft phase is assumed to nucleate dislocations in the hard phase in which movement is dictated by lattice friction stress. The polycrystalline composite yield stress is calculated by determining the equilibrium positions of the dislocation arrays as a function of the length scales, elastic constants and Burgers vectors in the two phases, with particular reference to melt oxidized Al-Al2O3, in which homophase boundaries are absent, and to the commercially important system Co-WC. The hardness values predicted from this model are in good agreement with experimentally measured values in the above systems. The implications of these results for the design of hard composite microstructures are elucidated.

Place, publisher, year, edition, pages
1999. Vol. 47, no 5, p. 1635-1643
Identifiers
URN: urn:nbn:se:ltu:diva-9620DOI: 10.1016/S1359-6454(99)00013-0Local ID: 8486e659-3494-46a7-ba94-c35e419aca53OAI: oai:DiVA.org:ltu-9620DiVA, id: diva2:982558
Note
Upprättat; 2012; 20120816 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-05-28Bibliographically approved

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