The contribution of the gas bubbling filtration (GBF) process to the microporosity variation, microstructural characteristics and tensile properties of A356 aluminium alloy was investigated.

The test specimens were fabricated through gravity casting in terms of the process variables: the degassing time, the impeller rotation and the aperture size of gas inlet hole.

The density measurement and scanning electron microscope fractography analyses were conducted to evaluate the variation of the volumetric porosity and fractographic porosity with the GBF process, respectively.

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