Friction stir processing (FSP) and superplasticity

Accepted  26 March 2015
Citation: T.R. McNelley. Friction stir processing (FSP) and superplasticity. Lett. Mater., 2015, 5(3) 246-252
BibTex   https://doi.org/10.22226/2410-3535-2015-3-246-252

Abstract

FSP is an allied technology of friction stir welding (FSW). The development and applications of these technologies are reviewed and additional considerations such as processing pattern and step over distance between successive passes in FSP are discussed. Microstructures formed as a result FSP often exhibit refined and uniform distributions of non-deforming constituents as well as highly refined grain structures, and superplastic response following FSP of wrought 7XXX and 5XXX Al alloys has been achieved. The application of multi-pass FSP to cast metals, including as-cast AA5083 and AA356 will be summarized and the conversion of as-cast microstructures to a wrought condition in the absence of external shape change will be shown. Grain refinement is the result of recrystallization during the rapid thermomechanical cycle of FSP. The mechanism(s) involved in homogenization of constituent particle distributions remain to be determined. The FSP-induced superplastic response of continuously cast AA5083 in the as-cast condition will be documented.

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