Mechanical properties of interfaces in metal-matrix composites ‒ GSM ‐ EPFL

Composites studied here were processed by an original gas-pressure infiltration developed in our laboratory. The processed composites were based on aluminum or magnesium alloys reinforced with short Al₂O₃ fibers or long C or SiC fibers. Composites were submitted to thermal cycling. A large damping maximum and a modulus anomaly were observed at low temperature in the case of magnesium matrices. These features were interpreted as due to the motion of dislocations in the matrix, which are relaxing the interface thermal stresses.

Publications (2000-2009)
Chowdhury A S M F, Mari D, Schaller R, Thermal stress relaxation in magnesium matrix composites controlled by dislocation breakaway. Composites Science and Technology. In Press, Accepted Manuscript doi:10.1016/j.compscitech.2009.10.001

Chowdhury A S M F, Mari D, Schaller R, Analysis of transient mechanical loss due to thermal stresses in metal matrix composites. Materials Science and Engineering: A. 2009; 521-522, 310-313

A. S. M. F. Chowdhury D M, R. Schaller,, Thermal stress relaxation in magnesium matrix composites studied by mechanical spectroscopy. Phys. Stat. Sol. (a). 2008; 205, 249-254.

Schaller R, Mechanical spectroscopy of interface stress relaxation in metal-matrix composites. Materials Science and Engineering: A. 2006; 442, 423-428.

O. Couteau and R. Schaller, “Study of thermal stress relaxation in metal matrix composites using mechanical spectroscopy.”, Mater. Sci. Eng. A 370 , 550-554, (2004).

O. Couteau and R. Schaller, “Effect of the fiber orientation on the transient damping in Metal Matrix Composites Using Mechanical Spectroscopy.”, Mater. Sci. Eng. A 387-389 , 862-866, (2004).

O. Couteau and R. Schaller, “Etude par spectroscopie mécanique de l’interface dans des composites à matrice magnésium.”, J. Phys. IV 106 , 63-68, (2003).

R. Schaller, “Metal matrix composites, a smart choice for high damping materials.”, J. Alloys and Compounds 355 , 131-135, (2003).

O. Couteau and R. Schaller, “Interface stress relaxation in magnesium matrix composites studied by mechanical spectroscopy.” Materials Science and Technology 19 , 955-958, (2003).

O. Couteau and R. Schaller, “Anelastic Properties of Magnesium-Matrix Composites as a Function of Temperature.”, Defect and Diffusion Forum 203-205 , 281-284, (2002).

E. Carreño-Morelli and R. Schaller, “Mechanical Loss and Dimensional Stability during Thermal Cycling of SiC Particle Reinforced Aluminum Alloys.” phys. stat. sol. (a) 194 , N°1, R1-R3, (2002).

E. Carreño-Morelli, N. Chawla and R. Schaller, “Thermo-mechanical characterization of 2080 Al/SiC_P composites by mechanical spectroscopy.”, J. of Materials Science Letters 20, 163-165, (2001).

E. Carreño-Morelli, “Interface stress relaxation in metal matrix composites”, in Mechanical Spectroscopy Q^-1 2001, R. Schaller, G. Fantozzi and G. Gremaud, eds., Materials Science Forum, vol. 366-368, 570-580 (2001).

C.Y. Xie, E. Carreño-Morelli, R. Schaller, Y. Pitton and R.C. Fornerod, “Mechanical loss spectrum of aged Al-Mg-Si alloys.”, Phil. Mag. A 81 , 2149-2160, (2001).

E. Carreño-Morelli, S.E. Urreta and R. Schaller, ” Mechanical Spectroscopy of Thermal Stress Relaxation at Metal-Ceramic Interfaces in Aluminium-Based Composites.”, Acta mater. 48, 4725-4733, (2000).

R. Schaller, D. Vincent. “High damping capacity magnesium-silicon alloy – is esp. eutectic alloy, is used for light-constructional parts.Patent CH667674-A, (1988)