Evaluation of the effect of artificial re-gassing of aluminium melts after ultrasonic treatment. (2nd January 2017)

• Record Type: Journal Article
• Authors: Cziegler, A.K.; Pabel, T.; Habe, D.; Schumacher, P.
• Is Part Of: International journal of cast metals research. Volume 30:Number 1(2017)
• Page Start: 30
• Page End: 33
• Publication Date: 2017-01-02
• Subjects: Al alloy -- Ultrasonic treatment -- Hydrogen -- Degassing -- Re-gassing; Metal castings -- Periodicals; Founding -- Periodicals; Foundry research -- Periodicals; Foundry chemistry -- Periodicals; 671.2
• DOI: 10.1080/13640461.2016.1194567
• Languages: English
• ISSNs: 1364-0461

Abstract

Abstract: Ultrasonic treatment of aluminium melts is known as an efficient process to remove dissolved hydrogen. Whereas the degassing efficiency of ultrasonic treatment has been extensively reported, the effect of re-gassing after the ultrasonic treatment is much less studied. The present investigation attempts to evaluate the effect of artificial re-gassing of aluminium melts after ultrasonic treatment was applied. The results show an increase in porosity after artificial re-gassing after ultrasonic treatment compared to artificial gassing before the ultrasonic treatment was applied. An increase in potent nucleation sites for gas porosity after ultrasonic treatment by unfolding and/or break-up of bifilms is supposed.