The Effect of Particle Content, Particle Distribution, and Cold Deformation on the Recrystallization of Low Oxide Al-Al2O3 Products

Niels Hansen, B. Bay

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The recrystallization of dispersion-strengthened Al-Al2O3 products containing 0.6 and 1.2 wt % Al2O3 was followed by optical and transmission electron microscopy and by hardness measurements. The recrystallization was retarded compared to aluminium and the important structural parameters were the oxide content (proportional to the reciprocal particle spacing) and the distribution of oxide particles either as a uniform distribution or as a regular three-dimensional network. From the microstructures after cold work and after recovery it is suggested that particle-retarded recrystallization may be caused by pinning, during the recovery stage, of sub-boundaries and of individual dislocations. The hypothesis of retardation of recrystallization as due to particle-enhanced homogenization of dislocation structures during deformation is not supported by the microstructural observations. In the product containing 0.6 wt% Al2O3 the recrystallization was markedly retarded after 50% cold reduction, whereas the retardation was small after 80 and 90% reduction. An increase in the degree of cold deformation may reduce the critical size of the recrystallization nuclei, and thus the retarding effect of particles during nucleation may be reduced or disappear. It is therefore suggested that the degree of cold deformation and the particle spacing may be interdependent parameters when determining the recrystallization behaviour of dispersion-strengthened products.
    Original languageEnglish
    JournalJournal of Materials Science
    Volume7
    Issue number12
    Pages (from-to)1351-1362
    ISSN0022-2461
    DOIs
    Publication statusPublished - 1972

    Cite this

    @article{84b5821691914677b55c1694061208fa,
    title = "The Effect of Particle Content, Particle Distribution, and Cold Deformation on the Recrystallization of Low Oxide Al-Al2O3 Products",
    abstract = "The recrystallization of dispersion-strengthened Al-Al2O3 products containing 0.6 and 1.2 wt {\%} Al2O3 was followed by optical and transmission electron microscopy and by hardness measurements. The recrystallization was retarded compared to aluminium and the important structural parameters were the oxide content (proportional to the reciprocal particle spacing) and the distribution of oxide particles either as a uniform distribution or as a regular three-dimensional network. From the microstructures after cold work and after recovery it is suggested that particle-retarded recrystallization may be caused by pinning, during the recovery stage, of sub-boundaries and of individual dislocations. The hypothesis of retardation of recrystallization as due to particle-enhanced homogenization of dislocation structures during deformation is not supported by the microstructural observations. In the product containing 0.6 wt{\%} Al2O3 the recrystallization was markedly retarded after 50{\%} cold reduction, whereas the retardation was small after 80 and 90{\%} reduction. An increase in the degree of cold deformation may reduce the critical size of the recrystallization nuclei, and thus the retarding effect of particles during nucleation may be reduced or disappear. It is therefore suggested that the degree of cold deformation and the particle spacing may be interdependent parameters when determining the recrystallization behaviour of dispersion-strengthened products.",
    author = "Niels Hansen and B. Bay",
    year = "1972",
    doi = "10.1007/BF00574925",
    language = "English",
    volume = "7",
    pages = "1351--1362",
    journal = "Journal of Materials Science",
    issn = "0022-2461",
    publisher = "Springer New York",
    number = "12",

    }

    The Effect of Particle Content, Particle Distribution, and Cold Deformation on the Recrystallization of Low Oxide Al-Al2O3 Products. / Hansen, Niels; Bay, B.

    In: Journal of Materials Science, Vol. 7, No. 12, 1972, p. 1351-1362.

    Research output: Contribution to journalJournal articleResearchpeer-review

    TY - JOUR

    T1 - The Effect of Particle Content, Particle Distribution, and Cold Deformation on the Recrystallization of Low Oxide Al-Al2O3 Products

    AU - Hansen, Niels

    AU - Bay, B.

    PY - 1972

    Y1 - 1972

    N2 - The recrystallization of dispersion-strengthened Al-Al2O3 products containing 0.6 and 1.2 wt % Al2O3 was followed by optical and transmission electron microscopy and by hardness measurements. The recrystallization was retarded compared to aluminium and the important structural parameters were the oxide content (proportional to the reciprocal particle spacing) and the distribution of oxide particles either as a uniform distribution or as a regular three-dimensional network. From the microstructures after cold work and after recovery it is suggested that particle-retarded recrystallization may be caused by pinning, during the recovery stage, of sub-boundaries and of individual dislocations. The hypothesis of retardation of recrystallization as due to particle-enhanced homogenization of dislocation structures during deformation is not supported by the microstructural observations. In the product containing 0.6 wt% Al2O3 the recrystallization was markedly retarded after 50% cold reduction, whereas the retardation was small after 80 and 90% reduction. An increase in the degree of cold deformation may reduce the critical size of the recrystallization nuclei, and thus the retarding effect of particles during nucleation may be reduced or disappear. It is therefore suggested that the degree of cold deformation and the particle spacing may be interdependent parameters when determining the recrystallization behaviour of dispersion-strengthened products.

    AB - The recrystallization of dispersion-strengthened Al-Al2O3 products containing 0.6 and 1.2 wt % Al2O3 was followed by optical and transmission electron microscopy and by hardness measurements. The recrystallization was retarded compared to aluminium and the important structural parameters were the oxide content (proportional to the reciprocal particle spacing) and the distribution of oxide particles either as a uniform distribution or as a regular three-dimensional network. From the microstructures after cold work and after recovery it is suggested that particle-retarded recrystallization may be caused by pinning, during the recovery stage, of sub-boundaries and of individual dislocations. The hypothesis of retardation of recrystallization as due to particle-enhanced homogenization of dislocation structures during deformation is not supported by the microstructural observations. In the product containing 0.6 wt% Al2O3 the recrystallization was markedly retarded after 50% cold reduction, whereas the retardation was small after 80 and 90% reduction. An increase in the degree of cold deformation may reduce the critical size of the recrystallization nuclei, and thus the retarding effect of particles during nucleation may be reduced or disappear. It is therefore suggested that the degree of cold deformation and the particle spacing may be interdependent parameters when determining the recrystallization behaviour of dispersion-strengthened products.

    U2 - 10.1007/BF00574925

    DO - 10.1007/BF00574925

    M3 - Journal article

    VL - 7

    SP - 1351

    EP - 1362

    JO - Journal of Materials Science

    JF - Journal of Materials Science

    SN - 0022-2461

    IS - 12

    ER -