Effect of Friction Stir Processing on Microstructure and Tensile Properties of an Investment Cast Al-7Si-0.6Mg Alloy

Journal Article · Fri Oct 01 04:00:00 EDT 2010 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 41A(10):2507-2521

DOI:https://doi.org/10.1007/s11661-010-0324-1· OSTI ID:990532

Jana, Saumyadeep; Mishra, Rajiv S; Baumann, John B; Grant, Glenn J

Friction stir processing (FSP) is emerging as a promising tool for microstructural modification. The present study assesses the effects of FSP on the microstructure and mechanical properties of an investment cast Al-7Si-Mg alloy. FSP eliminates porosity and significantly refines eutectic Si particles. The extent of particle refinement varied with changes in processing conditions. High tool rotation rate and low to intermediate tool traverse speed generated a higher volume fraction of finer particles. Tensile ductility changed significantly as a result of FSP, whereas UTS improved only marginally. Yield strength was similar in both cast and FSPed samples under various heat treated conditions, with the highest value obtained after a T6 heat treatment. Further, FSP caused significant grain refinement in the stir zone, subsequently transforming into very coarse grains as abnormal grain growth (AGG) occurred during solution treatment at high temperature.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 990532
• Report Number(s): PNNL-SA-70868; VT0504000
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 41A(10):2507-2521, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 41A(10):2507-2521 Journal Issue: 10 Vol. 41A; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
DUCTILITY
EUTECTICS
FRICTION
GRAIN GROWTH
GRAIN REFINEMENT
HEAT TREATMENTS
MECHANICAL PROPERTIES
MICROSTRUCTURE
POROSITY
PROCESSING
ROTATION
TENSILE PROPERTIES
VELOCITY
YIELD STRENGTH
cast Al alloy
friction stir
microstructure
tensile strength