Abstract
In this study, ultrasonic vibration (USV) was evaluated in preparation of Al–8wt.%Cu alloys at a lab-scale. Moreover, the role of Ti–6Al–4V sonotrode erosion and its contribution in grain refining were analyzed. Based on the experimental conditions/parameters, it was found that the amount of impurities and the associated porosity were significantly reduced in USV treated alloys. Furthermore, USV reduced the time needed for dissolving the alloying element Cu, nevertheless, the best dissolving of Cu in this study was not possible without introducing further holding time. As a result of using a titanium-based sonotrode, a noticeable content of Ti was found in the ultrasonically treated alloys due to sonotrode erosion under USV. The dispersion of TiAl3 promoted, as a main factor, a grain refining effect at relatively constant and high melt temperature, other possible mechanisms of grain refining have been discussed.
Highlights
The reliability of research results highly depends on the quality of the utilized materials such as the filler alloys in brazing or welding
The developing of the required lab-scale alloys could start from their pure elements [2], from master alloys and pure elements [3], or the filler alloy could be mixed during the brazing process itself by using interlayers of the alloy elements [4]
The Impurities and Surface Porosity πc Following the method presented in Figure 4,πcthe results showed that papplying the first ultrasonic vibration (USV)
Summary
The reliability of research results highly depends on the quality of the utilized materials such as the filler alloys in brazing or welding. In many brazing or welding studies, filler alloys have to be designed and developed according to the research objective [1]. The quality of the filler alloy is the first precondition for a successful brazing process. The developing of the required lab-scale alloys could start from their pure elements [2], from master alloys and pure elements [3], or the filler alloy could be mixed during the brazing process itself by using interlayers of the alloy elements [4]. Preparing a filler alloy at a lab-scale is an imperative step in several cases, since the required alloy cannot be found ready in the market nor be obtained in a small quantity.
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