Spheroidisation and oxide disruption phenomena in direct selective laser melting (SLM) of pre-alloyed Al-Mg and Al-Si powders

E. O. Olakanmi, R. F. Cochrane, K. W. Dalgarno

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

7 Citations (Scopus)

Abstract

Spheroidisation and oxide disruption phenomena in the direct laser melting of pre-alloyed Al-Mg and Al-Si powders had been explored and interpreted in terms of Raleigh's instability, Marangoni convection, laser absorptivity, heat conductivity, fluidity of the melt volume and the powder's oxide content. Balling occurred only in the single layer parts due to the lower thermal conductivity of the bed and possibly the difference in wettability of the powder bed and sintered layers. The existence of a high degree of thermal expansion mismatch between the oxide film and the parent metal and a uniform oxide layer thickness were found to favour the disruption of the oxide shell promoting inter-particulate melting across the layers. This was the case for Al-Si parts, whereas SLM of pure aluminium and pre-alloyed Al-Mg powders gave rise to high incidence of randomly distributed pores.

Original languageEnglish
Title of host publicationTMS 2009 - 138th Annual Meeting and Exhibition - Supplemental Proceedings
Pages371-380
Number of pages10
Volume1
Publication statusPublished - Oct 5 2009
EventTMS 2009 - 138th Annual Meeting and Exhibition - San Francisco, CA, United States
Duration: Feb 15 2009Feb 19 2009

Other

OtherTMS 2009 - 138th Annual Meeting and Exhibition
CountryUnited States
CitySan Francisco, CA
Period2/15/092/19/09

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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    Olakanmi, E. O., Cochrane, R. F., & Dalgarno, K. W. (2009). Spheroidisation and oxide disruption phenomena in direct selective laser melting (SLM) of pre-alloyed Al-Mg and Al-Si powders. In TMS 2009 - 138th Annual Meeting and Exhibition - Supplemental Proceedings (Vol. 1, pp. 371-380)