[Kovove materialy - Metallic materials]
    Wed - November 13, 2024 - 19:40 No. of hits : 1798075 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 39 (2001), Issue 2

Threshold creep behaviour of an Al-8.5Fe-1.3V-1.7Si alloy reinforced with silicon carbide particulates
CADEK, J., KUCHAROVA, K., ZHU, S. J.
vol. 39 (2001), no. 2, pp. 77 - 84

Abstract
Creep behaviour of an Al-8.5Fe-1.3V-1.7Si (8009Al type) alloy reinforced with 15 vol. % SiC particulates - Al-8.5Fe-1.3V-1.7Si-15SiCp composite - is investigated at temperatures ranging from 623 to 823 K. At temperatures 623-723 K the creep is associated with a true threshold stress decreasing with increasing temperature more strongly than the shear modulus. The minimum creep strain rate is controlled by the lattice diffusion in the composite matrix and the true stress exponent is close to 5.
At temperatures 748-823 K the true threshold stress is not observed, the true activation energy of creep is higher than the activation enthalpy of lattice diffusion in the composite matrix and the true stress exponent of minimum creep strain rate increases with increasing applied stress. The creep behaviour at these temperatures is interpreted in terms of thermally activated detachment of dislocations from fine incoherent particles.

Key words
8.5Fe-1.3V-1.7Si-15SiCp composite, creep, true threshold stress, disappearance of the true threshold creep behaviour

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
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