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dc.contributor.authorMcNelley, T.R.
dc.date.accessioned2017-08-08T17:11:49Z
dc.date.available2017-08-08T17:11:49Z
dc.date.issued2015
dc.identifier.citationT.R. McNelley, "Friction stir processing (FSP) and superplasticity," Letters on Materials v. 5, no.3 (2015), pp. 246-252.en_US
dc.identifier.urihttp://hdl.handle.net/10945/55371
dc.description.abstractFSP 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. The deformation field for a rotating and advancing tool is not symmetric about the axis of tool motion. Thus, various spiral patterns with step over distances less than the tool pin diameter result in replacement of advancing interfaces (tool tangential velocity and traversing speed add) retreating interfaces (tool tangential velocity and traversing speed subtract) and greater homogeneity of the resulting stir zone microstructures. 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 continuously cast (CC) AA5083 and AA356 as well as a Na modified Al-7Si 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 mechanisms involved in homogenization of constituent particle distributions remains to be determined. The FSP-induced superplastic response of the AA5083 will be documented. In contrast, grain refinement in the Na modified Al-7Si alloy was insufficient to support superplasticity.en_US
dc.description.sponsorshipGeneral Motors Corporationen_US
dc.description.sponsorshipOffice of Naval Researchen_US
dc.format.extent7 p.en_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
dc.titleFriction stir processing (FSP) and superplasticityen_US
dc.typeArticleen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)en_US
dc.contributor.departmentMechanical and Aerospace Engineeringen_US
dc.subject.authorFriction stir processingen_US
dc.subject.authorRecrystallizationen_US
dc.subject.authorGrain refinementen_US
dc.subject.authorMicrostructure homogenizationen_US
dc.subject.authorParticle refinementen_US
dc.subject.authorMicrostructure stabilityen_US
dc.subject.authorSuperplasticityen_US


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