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

W. Woo; H. Choo; M. B. Prime; Z. Feng; B. Clausen

doi:10.1016/j.actamat.2007.12.020

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

W. Woo, H. Choo, M. B. Prime, Z. Feng, B. Clausen

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Abstract

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.

Original language	English
Pages (from-to)	1701-1711
Number of pages	11
Journal	Acta Materialia
Volume	56
Issue number	8
DOIs	https://doi.org/10.1016/j.actamat.2007.12.020
State	Published - May 2008

Funding

This work was supported by the NSF International Materials Institutes (IMI) Program under contract DMR-0231320. This work has benefited from the use of the Los Alamos Neutron Science Center at the Los Alamos National Laboratory, operated by Los Alamos National Security LLC for the National Nuclear Security Administration of the US Department of Energy under contract DE-AC52-06NA25396. This research was also sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle LLC for the US Department of Energy under Contract No. DE-AC05-00OR22725. The authors would like to thank S.R. Agnew and D.W. Brown for helpful discussions and A. Frederick, T. Sisneros and G. Wang for their help during experiments.

Funders	Funder number
NSF International Materials Institutes
US Department of Energy	DE-AC52-06NA25396
UT-Battelle LLC
National Nuclear Security Administration
Oak Ridge National Laboratory
Los Alamos National Laboratory
Innovative Medicines Initiative	DMR-0231320

Keywords

Contour method
Friction-stir welding
Magnesium alloys
Neutron diffraction
Residual stress

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10.1016/j.actamat.2007.12.020

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title = "Microstructure, texture and residual stress in a friction-stir-processed AZ31B magnesium alloy",

abstract = "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.",

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AU - Woo, W.

AU - Choo, H.

AU - Prime, M. B.

AU - Feng, Z.

AU - Clausen, B.

PY - 2008/5

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N2 - 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.

AB - 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.

KW - Contour method

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KW - Neutron diffraction

KW - Residual stress

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

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