Title

Embedding a Wrought Microstructure in a Cast Component: A Novel Application of Friction Stir Processing

Abstract

Friction stir processing (FSP) is a new solid state processing technique for microstructural modification in metallic materials. FSP has been applied to cast aluminum alloy A356 plates to modify the microstructure to enhance mechanical properties. FSP broke up and dispersed the coarse acicular Si particles creating a uniform distribution of Si particles in the aluminum matrix. Further, FSP healed the casting porosity. These microstructural changes led to a significant improvement in both strength and ductility. The strength improves by more than 50% along with more than 5X improvement in ductility. The fatigue strength improves by almost 100%. This novel technique can be used to embed 'wrought' microstructure in regions of interest and/or repair castings.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Aluminum Base Alloys; Ductility; Fatigue Strength; Morphology

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2005 American Foundry Society (AFS), All rights reserved.

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