Abstract
In the present paper, a nanostructured nickel alloy and a Ni/Si 3 N 4 (w) composite were fabricated by pulse current electrodeposition, and their superplastic tensile deformation behaviors were investigated at strain rates ranging from 1×10 -3 s -1 to 2×10 -2 s -1 and temperatures ranging from 673K to 823K. Optimal superplastic condition and the maximum elongation were determined. Scanning electron microscopy and transmission electron microscopy were employed to examine the microstructures of the as-deposited and deformed samples. The superplastic behavior of the alloy and composite were compared and discussed in terms of their grain growth behavior and accommodation mechanisms.
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