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  • Creep behavior of dispersion-hardened aluminum materials
    Kröpfl, I. ; Vöhringer, Otmar ; Macherauch, Eckard
    Dispersion-hardened aluminum materials of pure aluminum with extremely fine oxide and carbide dispersions and very fine grain sizes were creep-deformed under compressive loadings between 573 and 773 ... K. The creep behavior of the investigated materials is influenced by time, temperature, stress level and microstructure. An increasing content of dispersions causes increasing threshold stresses sigma_th and resistances against creep. The Norton plots of the minimum creep rate epsilon[dot]_min versus stress sigma are characterized by extremely high stress exponents n. On the basis of the threshold concept it is demonstrated that the same diffusion process dominates in the dispersion-hardened aluminum materials as in pure aluminum. Their true stress exponents n* as the slopes of the best fit lines of the log\epsilon[dot]_min versus log(sigma - sigma_th) are close to 5. The threshold stress decreases considerably with increasing temperature due to the thermally activated recovery of long-range internal back stresses of quasi-planar dislocation structures on the grain boundaries.
    Vir: Mechanics of time-dependent materials : an international journal devoted to the time-dependent behaviour of materials and structures. - ISSN 1385-2000 (Vol. 3, no. 1, 1999, 1-13)
    Vrsta gradiva - članek, sestavni del
    Leto - 1999
    Jezik - angleški
    COBISS.SI-ID - 3835163

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