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Metals 2017, 7(5), 157; doi:10.3390/met7050157

Characterization of the Effect of Melt Treatments on Melt Quality in Al-7wt %Si-Mg Alloys

1
Department of Metallurgical and Materials Engineering, Faculty of Natural Sciences, Architecture and Engineering, Bursa Technical University, Bursa, Turkey
2
Faculty of Engineering, Halic University, Istanbul, Turkey
3
Faculty of Engineering, Istanbul University, Istanbul, Turkey
4
School of Engineering, University of North Florida, Jacksonville, FL 32224, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Nong Gao
Received: 22 February 2017 / Revised: 12 April 2017 / Accepted: 27 April 2017 / Published: 29 April 2017
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Abstract

The effects of degassing, holding time and melt additions (Sr, Sr + Ti, Ti, B and B + Sr) on the quality of A356 melts were examined. A total of 120 reduced pressure test samples were collected. Pores in these samples were analyzed via digital image processing to determine the number density of pores as well as the statistical distribution of their sizes. Results showed that in all cases, degassing with argon reduced the number of defects regardless of the additions made to the melts. Moreover, all additions were found to degrade melt quality. The lowest number density of pores in all melts was achieved in melts with no additions that were degassed. In both degassed and non-degassed melts, Sr additions degraded the melt quality significantly. The mechanisms of melt quality improvement or degradation with different melt treatments are discussed in the paper. View Full-Text
Keywords: A356 alloy; degassing; grain refinement; modification; pore size A356 alloy; degassing; grain refinement; modification; pore size
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Uludağ, M.; Çetin, R.; Dispinar, D.; Tiryakioğlu, M. Characterization of the Effect of Melt Treatments on Melt Quality in Al-7wt %Si-Mg Alloys. Metals 2017, 7, 157.

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