Microstructure, texture, and residual stress in a friction stir processed AZ31B magnesium alloy

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2007.12.020· OSTI ID:959037

Woo, Wan Chuck ^[1]; Choo, Hahn ^[1]; Feng, Zhili ^[1]; Clausen, B ^[2]; Prime, Michael B ^[1]

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1. ORNL
2. Los Alamos National Laboratory (LANL)

Spatial variations of microstructure, hardness, chemical composition, tensile behavior, texture and residual stresses were investigated in a friction-stir-processed (FSP) AZ31B magnesium alloy. The residual stresses were measured using two different methods: neutron diffraction and the contour method. No significant variations in the hardness and chemical compositions were found in the FSP zones, including the severely deformed stir zone (SZ), which showed a finer grain size compared to the heat-affected zone and base material. On the other hand, significant changes in the tensile yield strength, texture, and residual stresses were observed in the FSP zones. The relationship between the texture variations and yield strength reduction; and its influence on the decrease in the residual stress near the SZ is discussed. Finally, the residual stresses measured by neutron diffraction and the contour method are compared and the effect of the texture on neutron diffraction residual stress measurements is discussed.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: ORNL LDRD Director's R&D
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 959037
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 8 Vol. 56; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
FRICTION
GRAIN SIZE
HARDNESS
MAGNESIUM ALLOYS
MICROSTRUCTURE
NEUTRON DIFFRACTION
RESIDUAL STRESSES
TEXTURE
YIELD STRENGTH