Embedding a Wrought Microstructure in a Cast Component: A Novel Application of Friction Stir Processing
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.
R. S. Mishra et al., "Embedding a Wrought Microstructure in a Cast Component: A Novel Application of Friction Stir Processing," Transactions of the American Foundry Society, American Foundry Society (AFS), Apr 2005.
Materials Science and Engineering
Keywords and Phrases
Aluminum Base Alloys; Ductility; Fatigue Strength; Morphology
Article - Conference proceedings
© 2005 American Foundry Society (AFS), All rights reserved.