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Abstract
In this work, the microstructural changes occurring during cooling of friction-stir welded aluminum alloy AA1100 were evaluated. To this end, friction-stir welding (FSW) was performed in a wide range of cooling rates of 20–62 K/s and the evolved microstructures were studied by using electron backscatter diffraction. Below 0.6 Tm (Tm being the melting point), the stir zone material was found to experience no significant changes during cooling. At higher FSW temperatures, however, notable changes occurred in the welded material, including grain growth, sharpening of texture, reduction of the fraction of high-angle boundaries and material softening.
Acknowledegment
The authors are grateful to Mr. A. Honda for technical assistance and Dr. K. Kobayashi for help with EBSD measurements. One of the authors (S. Mironov) would like to express his hearty thanks to Tohoku University for providing a scientific fellowship.
Notes
1. Significant scatter in data in Figure (b) is thought to be attributable to different welding speed as well as to sensitivity of the measuring thermocouples to particular location.