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Cyclic extrusion and compression (CEC) was implemented to process the Mg-Gd-Y-Zr alloy. Microstructure characters, including the matrix grain, precipitates and texture evolution, were tried to correlate with the mechanical performance of the post-processed alloy. Results show that simultaneous improvements in the ductility and strength of Mg-Gd-Y-Zr alloy were achieved after CEC. Combination of the greatly refined matrix grain, uniformly precipitated nanoscale particles and gradually disintegrated texture should be responsible for this result. Besides, introducing of rare-earth elements was found to change the deformation mechanisms of the Mg alloy by facilitating non-basal slip systems, twinning and shear bands. This may further contribute to the enhanced mechanical properties.

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The closed-cell aluminum foam reinforced by 1.5 and 3.0 wt.% fly ash particles were manufactured by molten body transitional foaming process. The backscattered electron image shows that fly ash particles distribute uniformly in the cell wall. The quasi-static compression tests were conducted. Results show that Al/Fly ash foams have stable compressive property and the sudden stress drop was not observed. The plateau stress increases nearly linearly with relative density. Moreover, the addition of fly ash particles improves the plateau stress. Also, the energy absorption property of Al/Fly ash foams increase with relative density and fly ash content. These can be attributed to the contribution of the compression of cell gas and the membrane stress in the cell wall.

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