Abstract
The evolution of pore morphology of closed cell Al-Si alloy foams during compression was examined using X-ray computed tomography. The stress-strain curves of the foams were obtained. The structural deformation of the pores during compression and the microstructures were analysed. Al-Si alloy foams were found to present brittle behaviour; cracks appeared in cell walls after the elastic deformation stage. As the compression proceeded, the cracks extended and some of the cell walls fractured and a crack developed through the specimen causing failure. As the relative density increased, yield strength and effective elastic modulus of Al-Si foams increased. For φ (volume fraction of solid) between 0.97and 0.2 the measured elastic modulus and yield strength were consistent with existing empirical models for foam materials.
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