Abstract
Abstract Al-10.8Zn-2.8Mg-1.9Cu-0.16Zr alloy was manufactured by the spray forming technique. Optical microscopy (OM) and field emission scanning electron microscopy (FESEM) were used to investigate microstructures of the spray-formed alloy. Morphology characteristics of all kinds of pores in as-deposited billet were summarized, and their formation mechanism in the alloy was studied. The influences of hot isostatic pressure treatment (HIP) and homogenizing treatment on porous defects in spray formed 7XXX aluminum alloy were studied. The results indicate that the porous defects in the spray-formed alloy are interstices, interlinked pores and gas pores. The distribution and types of porous defects are related with positions of the preform. The main defects in the center of the alloy perform are interstices and gas pores. More interconnected pores are located at the edge of as-deposited billet. The walls inside gas pores are smooth and concave, and the morphology of gas pores remains nearly spherical. Other porous defects show irregular geographies. HIP treatment can get rid of porous defects except for gas pores. Gas pores reappear after heat treatment because they are close pores actually.
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