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- W1988133049 abstract "In the present investigation, directional cavity stringer formation in the fine-grained superplastic 7075 Al alloy, which has the different grain sizes and second phase particle distributions, were examined. Rolling reduction ratios 70 and 90%, were applied in the course of the thermomechanical treatment to produce different initial microstructures. Tensile tests were conducted at 789 K at strain rates from 2×10−4 s−1 to 1.33×10−2 s−1. The alloy, with a rolling ratio of 70%, exhibited a relatively large grain size of 12 μm and the stringer type of distribution of second phase particles along the rolling direction, while that with the rolling ratio of 90% showed a relatively small grain size of 8 μm and a uniform distribution of second phase particles. In the former, cavity stringers were always parallel to the rolling direction, irrespective of the testing direction. In contrast, in the latter, the cavity stringers were always aligned along the tensile axis regardless of the rolling direction and the cavity size was smaller than that observed in the former. Based on the experimental observation, the mechanisms of the cavity stringer formation in the alloy were explored in terms of the microstructural evolution during the thermomechanical treatment and the superplastic deformation." @default.
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- W1988133049 date "1999-08-01" @default.
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- W1988133049 title "Directional cavity stringer formation in a superplastic 7075 Al alloy" @default.
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- W1988133049 doi "https://doi.org/10.1016/s0921-5093(99)00116-1" @default.
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