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Keywords
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In this study, the effects of tool rotational
speed, tool traverse speed, and Zn content on the grain size
and hardness of the friction-stir-welded (FSWed) Cu–Zn
alloy joints were investigated. The microstructures of the
joints were examined using optical microscope (OM) and
scanning transmission electron microscope (STEM).
Vickers hardness test was conducted to evaluate the hardness
of the joints. In addition, the relationships between the
process parameters, grain size, and hardness of the joints
were established. The results show that the developed
relationships predict the grain size and hardness of the
joints accurately. The Zn content of the alloys is the most
effective parameter on the grain size and hardness, where
the tool traverse speed has the minimum effect. The relationship
between the hardness and grain size of the joints
has a deviation from the Hall–Petch equation due to formation
of high dislocation density inside the grains. At
higher Zn amounts, the dislocation tangl
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Abstract
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In this study, the effects of tool rotational
speed, tool traverse speed, and Zn content on the grain size
and hardness of the friction-stir-welded (FSWed) Cu–Zn
alloy joints were investigated. The microstructures of the
joints were examined using optical microscope (OM) and
scanning transmission electron microscope (STEM).
Vickers hardness test was conducted to evaluate the hardness
of the joints. In addition, the relationships between the
process parameters, grain size, and hardness of the joints
were established. The results show that the developed
relationships predict the grain size and hardness of the
joints accurately. The Zn content of the alloys is the most
effective parameter on the grain size and hardness, where
the tool traverse speed has the minimum effect. The relationship
between the hardness and grain size of the joints
has a deviation from the Hall–Petch equation due to formation
of high dislocation density inside the grains. At
higher Zn amounts, the dislocation tangles with high density
form instead of dislocation cells, and hence, lower
conformity with the Hall–Petch relationship is observed.
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