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A Microscopic Examination Of Void Formation In Superplastic Materials

There are two distinct groups of superplastic materials, depending on whether the final fracture surface has a large cross‐sectional area at optimum ductility or the specimen gradually pulls down to a very fine point. Experiments on a commercial superplastic copper alloy and the Zn‐22% Al eutectoid indicate that the formation of internal voids is important in materials of both groups. In addition, the results show that the size and shape of the internal voids is dependent both on the material and the testing conditions.