Grain-boundary sliding and intergranular cavitation during superplastic deformation of α/β brass
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Intergranular and interphase cavitation in binary alpha/beta brass has been investigated in tension at 600° C under conditions of superplastic deformation. The sites for nucleation of cavities has been studied by quantitative metallography and the cavities are observed to nucleate preferentially atα-β interfaces. The process of cavitation is associated with grain boundary sliding and cavity nucleation occurs at points of stress concentrations in the sliding interfaces. Measurements of grain and phase boundary sliding at various interfaces demonstrate that sliding occurred onα-β boundaries more readily than onα-α andβ-gb interfaces. The predominance ofα-β interface cavitation is believed to be as a result of greater sliding at theα-β boundary and of an unbalanced accommodation of sliding adjacent to this type of boundary.
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