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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

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Manufacturing and damage mechanisms in metal matrix composites

Bayraktar E., Masounave J., Caplain R., Bathias C.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 31, nr 2

294-300

Purpose: Mechanical properties of metal matrix composites (MMCs) are essentially functions of the manufacturing processes. Surface state and roughness conditions as well as the type of matrix reinforcement and heat treatment influence the mechanical behaviour of the MMCs in service conditions. The factors such as the porosity of the matrix, volume fraction of the reinforcement and their distribution, agglomeration or sedimentation of particles and particle size, dross and porosities influence the behaviour of the MMC. The static and cyclic deformation behaviour of these two metal matrix composites has been investigated at room temperature; 2124/Al-Si-Cu fabricated by powder metallurgy and AS7G/Al-Si-Mg fabricated by foundry. Design/methodology/approach: In cyclic deformation, surface roughness effect on the damage behaviour has been discussed. The microstructure for optical images was made by Olympus optical microscope (OM). The failed specimens are observed by using of scanning electron microscope (SEM) and also the variation of volume fraction depending on the tomography density (TD) was evaluated by means of X-rays computed tomography, CT. Findings: AS7G composite showed considerable lower mechanical properties regarding to the 2124 composite. In the AS7G composite, the crack generally initiated at the interface (SiC/matrix) with many interface debonding between the SiC particles and the matrix. This was the principal cause of the reduced fatigue strength. Practical implications: Applications of χ -rays CT on the composite materials is more efficient and skilful. χ -rays CT well characterise the particle size and the distribution of the reinforcements-volume fraction as 3D at the mesoscopic scale as a possible way to study this aspect. Originality/value: Manufacturing of two new different MM-composites and damage analysis in successful usage of aerospace application.