Effect of processing parameters on the density and microstructure of direct laser sintered Al-12Si powders

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

Research output: Contribution to conferencePaper

Abstract

The effect of processing parameters on the sintering behaviour of gas atomised Al-12Si powders has been investigated. Laser power, scanning rate, scan spacing and layer thickness are found to control the densification and the resultant microstructural characteristics of the laser sintered parts. It was found that sintered density increased as the energy density increased reaching a maximum of 80.2% at an energy input per unit volume of 67 J mm-3. For parts produced with a slightly lower power density (50 J mm-3), the microstructure consisted of fine dendrites with interconnected porosity while parts fabricated with a slightly higher power density (100 J mm -3) were noted to have a preponderance of coarse dendrites with a discontinuous network of irregular shaped pores surrounded by a fully dense aluminium-silicon matrix.

Original languageEnglish
Pages299-311
Number of pages13
Publication statusPublished - Jan 1 2007
Event18th Solid Freeform Fabrication Symposium, SFF 2007 - Austin, TX, United States
Duration: Aug 6 2007Aug 8 2007

Other

Other18th Solid Freeform Fabrication Symposium, SFF 2007
CountryUnited States
CityAustin, TX
Period8/6/078/8/07

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All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Olakanmi, E. O., Cochrane, R. F., & Dalgarno, K. W. (2007). Effect of processing parameters on the density and microstructure of direct laser sintered Al-12Si powders. 299-311. Paper presented at 18th Solid Freeform Fabrication Symposium, SFF 2007, Austin, TX, United States.