Internal friction in AlCu-Al{sub 2}O{sub 3} metal matrix composites
- Ecole Polytechnique Federale de Lausanne (Switzerland). Inst. de Genie Atomique
In MMC`s 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%Cu based MMC`s reinforced with 20% Al{sub 2}O{sub 3} fibers were characterized by internal friction (IF) measurements. IF measurements as a function of the vibration amplitude present a solid friction peak connected with interfaces loosening, while plastic deformation was associated with a high amplitude IF background. On this basis, IF measurements 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:
- 62971
- Report Number(s):
- CONF-941016--; ISBN 0-87339-247-7
- Country of Publication:
- United States
- Language:
- English
Similar Records
Characterization of mechanical stresses in metal matrix composites by internal friction
Thermal stresses in metal matrix composites studied by internal friction