首页|Anelastic phenomena at the fibre-matrix interface of the Ti6Al4V-SiC_f composite
Anelastic phenomena at the fibre-matrix interface of the Ti6Al4V-SiC_f composite
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The composite, consisting of Ti6Al4V matrix reinforced by unidirectional SiC fibres (SCS-6), has been investigated by mechanical spectroscopy at temperatures up to 1,173 K. For comparison, the same experiments have been performed on the corresponding monolithic alloy. The internal friction (IF) spectrum of the composite exhibits a new relaxation peak superimposed to an exponentially increasing background. This peak, which is not present in the monolithic alloy, has an activation energy H = 186 kJ mol~(-1) and a relaxation time τ_0= 2.3 × 10~(-15) s. The phenomenon has been attributed to a reorientation of interstitial-substitutional pairs in the a phase of Ti6Al4V matrix around the fibres. This explanation is supported by the results of micro-chemical characterization carried out by X-ray photoelectron spectroscopy (XPS) combined with Ar ion sputtering.
metal matrix compositeTi6Al4VSiC fibreinternal frictiondynamic modulusXPS
P. Deodati、R. Donnini、S. Kaciulis、A. Mezzi、R. Montanari、C. Testani、N. Ucciardello
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Department of Mechanical Engineering, University of Rome 'Tor Vergata', Via del Politecnico 1, 00133 Rome, Italy
Institute for the Study of Nanostructured Materials, ISMN-CNR, P.O. Box 10, 00016 Monterotondo Stazione, Rome, Italy
Centro Sviluppo Materiali (CSM), Via di Castel Romano 100, 00128 Rome, Italy
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