Low temperature damping behaviour of Ti6Al4V-SiCf composite
- Amadori, S
- Bonetti, E
- Deodati, P
- Donnini, R
- Pasquini, L
- Testani, C.
- MONTANARI, ROBERTO
DOIAbstract
Internal friction and dynamic Young modulus measurements have been performed in the temperature range 80–350K on the Ti6Al4V alloy and a Ti6Al4V–SiCf composite reinforced by unidirectional SiC fibers (SCS-6). A vibrating reed apparatus operating at low strain amplitude (<10−5) in the frequency range 10 2–10 4 Hz was employed. Two anelastic relaxation peaks: P1, P2 have been observed in both materials. The peak temperatures at 1 kHz are respectively 120K and 250 K. The fiber reinforced composite in the same temperature range shows a higher background damping and enhanced relaxation strength for the P1 peak. The activation energy and frequency factors evaluated from the peak temperature shift with frequency are respectively H1 = 0.21±0...
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