A finite element model for consolidation of vacuum plasma spray-formed metal matrix composites

H. N. Han, D. L. Gilmore, B. Derby

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Monotapes consisting of Ti-6Al-4V vacuum plasma-sprayed onto SiC fibres were consolidated by uniaxial vacuum hot pressing. This consolidation process was modelled by computational analysis of a representative unit cell. To describe the initial deformation and densification behaviour of the monotape surface asperities, a yield criterion was derived using a continuum mechanics approach for porous metals and a contact mechanics approach for rough surfaces. Yield criteria for porous metals were applied to the subsequent consolidation of the surface and the remaining matrix. Mechanism-based constitutive equations which consider work hardening, strain rate and grain growth effects were used to describe the high-temperature deformation behaviour of the matrix. The density distributions in the monotape unit cell were calculated and compared with experimental data. Consolidation maps, which may be used to select appropriate processing parameters, were constructed from the finite element analysis. The effect of fibre spacing on consolidation is also predicted. © 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)4339-4350
    Number of pages11
    JournalActa Materialia
    Volume46
    Issue number12
    Publication statusPublished - 24 Jul 1998

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