Abstract
Cavitation in superplastically formed AA7475 aluminum alloy by gas pressure has been investigated. Two systems of cavity stringers on the diametrical section of the pressure-formed domes were observed by using optical microscopy under normal light, polarized light, and dark field. Qualitative analyses have shown that the cavity stringers are oriented 35 ∼ 60 deg to the midplane of the sheet, and the spacing of the cavity stringers decreases with increasing strain. The explanation of this new observation of cavity morphology is given from a viewpoint of cooperative grain boundary sliding (CGBS).
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