Long-Term Heat Treatments on Ti6Al4V-SiCf Composite. Part I - Microstructural Characterization

Author:

Donnini Riccardo1,Kaciulis Saulius2,Mezzi Alessio2,Montanari Roberto1,Testani Claudio3

Affiliation:

1. University of Rome - Tor Vergata

2. Instituto per lo Studio dei Materiali Nanostrutturati CNR

3. Centro Sviluppo Materiali, SpA. (CSM)

Abstract

The microstructure of Ti6Al4V-SiCf composite, in as-fabricated condition and after long-term heat treatments (up to 1,000 hours) in the temperature range 400 - 600 °C, has been investigated by means of high-temperature X-ray diffraction (HT-XRD), energy dispersion spectrometry (EDS), X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). Particular attention was paid to the strains, arising during heating, and to the micro-chemical evolution of fibre-matrix interface. Micro-chemical examinations evidenced that a thin TiC layer has formed between the fibre carbon coating and the matrix during the fabrication process. TiC slows down further diffusion of carbon towards the matrix and guarantees the interface stability also for the most severe treatments examined here.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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