Use of nano-structured silanols on the solidification of aluminum-silicon based casting alloys

Andre Lee, Yang Lu, Allen Roche, Tsung Yu Pan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Minor alloying elements had been used to modify the solidification process leading to improve mechanical performance of Aluminum casting alloys. However, difficulties in balancing strength, ductility and the subsequent precipitation strengthening heat treatment remain. In this study, use of nano-structured silanols based on partially-condensed polyhedral oligomeric silsequioxanes (POSS-silanol) was examined. The silanols react with active aluminum surface to form stable Si-O-Al bonds, while cage-like POSS core enables control of subsequent solidification process leading desired mechanical performance. Specifically, trisilanol phenyl POSS modifier was added to the casting alloy A4047. Using standard casting approach, a highly refined fine fibrous of eutectic Al-Si formed instead of the irregular flakes, which lead to a significant improvement in its ductility while improve the tensile strength as compared to the unmodified A4047. This newly developed approach was expanded to other heat-treatable casting aluminum alloys with specific interest on changes in the eutectic Al-Si microstructure.

LanguageEnglish (US)
Title of host publicationLight Metals 2015 - At the TMS 2015 Annual Meeting and Exhibition
PublisherMinerals, Metals and Materials Society
Pages375-377
Number of pages3
Volume2015-January
ISBN (Electronic)9781119082446
StatePublished - 2015
EventLight Metals 2015 - TMS 2015 Annual Meeting and Exhibition - Orlando, United States
Duration: Mar 15 2015Mar 19 2015

Other

OtherLight Metals 2015 - TMS 2015 Annual Meeting and Exhibition
CountryUnited States
CityOrlando
Period3/15/153/19/15

Profile

Silicon
Aluminum
solidification
Solidification
Casting
aluminum
Eutectics
Ductility
silicon
ductility
eutectics
Aluminum castings
Strengthening (metal)
Alloying elements
Aluminum alloys
flakes
Tensile strength
Heat treatment
aluminum alloys
tensile strength

Keywords

  • Cast Aluminum alloy
  • Nanostructured silanols
  • Solidification

ASJC Scopus subject areas

  • Metals and Alloys
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Lee, A., Lu, Y., Roche, A., & Pan, T. Y. (2015). Use of nano-structured silanols on the solidification of aluminum-silicon based casting alloys. In Light Metals 2015 - At the TMS 2015 Annual Meeting and Exhibition (Vol. 2015-January, pp. 375-377). Minerals, Metals and Materials Society.

Use of nano-structured silanols on the solidification of aluminum-silicon based casting alloys. / Lee, Andre; Lu, Yang; Roche, Allen; Pan, Tsung Yu.

Light Metals 2015 - At the TMS 2015 Annual Meeting and Exhibition. Vol. 2015-January Minerals, Metals and Materials Society, 2015. p. 375-377.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lee, A, Lu, Y, Roche, A & Pan, TY 2015, Use of nano-structured silanols on the solidification of aluminum-silicon based casting alloys. in Light Metals 2015 - At the TMS 2015 Annual Meeting and Exhibition. vol. 2015-January, Minerals, Metals and Materials Society, pp. 375-377, Light Metals 2015 - TMS 2015 Annual Meeting and Exhibition, Orlando, United States, 3/15/15.
Lee A, Lu Y, Roche A, Pan TY. Use of nano-structured silanols on the solidification of aluminum-silicon based casting alloys. In Light Metals 2015 - At the TMS 2015 Annual Meeting and Exhibition. Vol. 2015-January. Minerals, Metals and Materials Society. 2015. p. 375-377.
Lee, Andre ; Lu, Yang ; Roche, Allen ; Pan, Tsung Yu. / Use of nano-structured silanols on the solidification of aluminum-silicon based casting alloys. Light Metals 2015 - At the TMS 2015 Annual Meeting and Exhibition. Vol. 2015-January Minerals, Metals and Materials Society, 2015. pp. 375-377
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