Dispersion strengthening of aluminium-aluminium-oxide products

Niels Hansen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The true stress-true strain curves at room temperature and at 400°C were determined for various types of aluminium-aluminium-oxide products containing from 0.2 to 4.7 weight per cent of aluminium oxide. The effect of particles on the initial flow stress and the flow stress for 0.2% offset at room temperature and at 400°C is in agreement with Orowan's theory. The increase in flow stress at room temperature for strain values below 3 per cent was related to the plastic strain by the equation σ-σoy=k1ε 1/2, where σoy is the initial flow stress and where k1 increases for increasing volume fraction and decreasing particle size of the dispersed particles. A general expression for k1 was derived for the relationship between the dislocation density and the strain in dispersion-strengthened products
    Original languageEnglish
    JournalACTA METALLURGICA
    Volume18
    Issue number1
    Pages (from-to)137-145
    ISSN0001-6160
    DOIs
    Publication statusPublished - 1970

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