Effect of Stress Ratio on the Fatigue Behavior of a Friction Stir Processed Cast Al-Si-Mg Alloy

Journal Article · Sun Nov 01 04:00:00 EST 2009 · Scripta Materialia, 61(10):992-995

DOI:https://doi.org/10.1016/j.scriptamat.2009.08.011· OSTI ID:969607

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

The effect of friction stir processing (FSP) on the fatigue life of a cast Al-7Si-0.6Mg alloy at a stress ratio of R=0 was evaluated. Two types of specimen geometry were used for the FSPed condition, through-thickness processed and partial thickness processed. FSP enhanced the fatigue life by a factor of 15 for the through thickness processed samples at lower stress amplitudes. This is different from the FSP specimens tested at R=-1 and similar stress amplitudes where a 5 times improvement in fatigue life was observed. In light of these observations, various closure mechanisms were examined.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 969607
• Report Number(s): PNNL-SA-68049; VT0504000
• Journal Information: Scripta Materialia, 61(10):992-995, Journal Name: Scripta Materialia, 61(10):992-995 Journal Issue: 10 Vol. 61; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
FABRICATION
FATIGUE
FRICTION
Friction Stir Welding
FSW
Fatigue
Cast Aluminum Alloy
MAGNESIUM ADDITIONS
SILICON ALLOYS
STRESSES