Internal friction in AlCu-Al{sub 2}O{sub 3} metal-matrix composite
- Inst. de Genie Atomique, Lausanne (Switzerland). Ecole Polytechnique Federale de Lausanne
In metal-matrix composites (MMCs), the metal matrix is exposed to plastic deformation and damage accumulation in the region close to the reinforcements, following mechanical or thermal stress. In this connection, Al-4 wt pct Cu-based MMCs reinforced with 20 vol pct Al{sub 2}O{sub 3} fibers were characterized by internal friction (IF) measurements. The IF measurements as a function of the vibration amplitude present a solid friction peak connected with the loosening of metal-fiber interfaces, while plastic deformation was associated with a high amplitude IF background. On this basis, IF measurement allowed the authors to identify the distribution of internal stresses and damage accumulation at matrix-fiber interfaces or plastic flow in the matrix in different thermomechanical conditions. Furthermore, IF measurements allowed damage accumulation consequent to mechanical fatigue to be followed.
- OSTI ID:
- 78411
- Journal Information:
- Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 6 Vol. 26; ISSN 0360-2133; ISSN MTTABN
- Country of Publication:
- United States
- Language:
- English
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