Microstructure and mechanical properties of Al-12Si produced by selective laser melting: Effect of heat treatment

Al-12Si specimens are produced by selective laser melting (SLM) from gas atomized powders. An extremely fine cellular structure is observed with residual free Si along the cellular boundaries. Room temperature tensile tests reveal a remarkable mechanical behavior: the samples show yield and tensile strengths of about 260. MPa and 380. MPa, respectively, along with fracture strain of ~3%. The effect of annealing on microstructure and related tensile properties is examined and the results demonstrate that the mechanical behavior of the Al-12Si SLM samples can be tuned within a wide range of strength and ductility through proper annealing treatment.

[1]  Jean-Pierre Kruth,et al.  Direct Selective Laser Sintering of Hard Metal Powders: Experimental Study and Simulation , 2002 .

[2]  J. Eckert,et al.  Powder metallurgy of Al-based metal matrix composites reinforced with β-Al3Mg2 intermetallic particles: Analysis and modeling of mechanical properties , 2009 .

[3]  K. Mumtaz,et al.  Melting of thin wall parts using pulse shaping , 2009 .

[4]  C. V. van Blitterswijk,et al.  Fabrication of Porous Ti6Al4V with Designed Structure by Rapid Prototyping Technology , 2007 .

[5]  H. Rietveld.  A profile refinement method for nuclear and magnetic structures , 1969 .

[6]  Kamran Mumtaz,et al.  High density selective laser melting of Waspaloy , 2008 .

[7]  F. Samuel,et al.  Production of Al-(12–25) wt% Si alloys by rapid solidification: melt spinning versus centrifugal atomization , 1992 .

[8]  P. Paufler,et al.  Micro- and nanoindentation techniques for mechanical characterisation of materials , 2006 .

[9]  Hsun Hu,et al.  TEXTURE OF METALS , 1974 .

[10]  E. Brandl,et al.  Additive manufactured AlSi10Mg samples using Selective Laser Melting (SLM): Microstructure, high cycle fatigue, and fracture behavior , 2012 .

[11]  C. Hauser,et al.  Selective Laser Melting of Prealloyed High Alloy Steel Powder Beds , 2006 .

[12]  T. Sercombe,et al.  Rapid Manufacturing of Aluminum Components , 2003, Science.

[13]  Andrey V. Gusarov,et al.  Single track formation in selective laser melting of metal powders , 2010 .

[14]  S. Bose,et al.  Structure of rapidly solidified aluminium-silicon alloys , 1973 .

[15]  B. Suárez-Peña,et al.  Microstructure and mechanical property developments in Al–12Si gravity die castings after Ti and/or Sr additions , 2006 .

[16]  Ning Liu,et al.  Development of highly porous titanium scaffolds by selective laser melting , 2010 .

[17]  Takashi Nakamura,et al.  Bioactive Ti metal analogous to human cancellous bone: Fabrication by selective laser melting and chemical treatments. , 2011, Acta biomaterialia.

[18]  Yulin Hao,et al.  Manufacture by selective laser melting and mechanical behavior of a biomedical Ti–24Nb–4Zr–8Sn alloy , 2011 .

[19]  K. Benyounis,et al.  Rapid solidification of M2 high-speed steel by laser melting , 2009 .

[20]  Igor Smurov,et al.  Surface Morphology in Selective Laser Melting of Metal Powders , 2011 .

[21]  J. Kruth,et al.  Mechanical Properties of AlSi10Mg Produced by Selective Laser Melting , 2012 .

[22]  Y. Birol.  Microstructural evolution during annealing of a rapidly solidified Al–12Si alloy , 2007 .

[23]  J. Kruth,et al.  Fine-structured aluminium products with controllable texture by selective laser melting of pre-alloyed AlSi10Mg powder , 2013 .

[24]  Heat treatment of Ti6Al4V produced by Selective Laser Melting: Microstructure and mechanical properties , 2012 .

[25]  Christopher J. Sutcliffe,et al.  Selective laser melting of heat transfer devices , 2007 .

[26]  L. Murr,et al.  Microstructures and mechanical behavior of Inconel 718 fabricated by selective laser melting , 2012 .

[27]  J. Eckert,et al.  Rapid Manufacturing of Cellular Structures of Steel or Titaniumalumide , 2011 .

[28]  J. Beaman,et al.  Powder densification maps in selective Laser Sintering , 2002 .

[29]  Yong-qiang Yang,et al.  Research on track overlapping during Selective Laser Melting of powders , 2012 .

[30]  Z. Hu,et al.  A coherent polycrystal model for the inverse Hall-Petch relation in nanocrystalline materials , 1999 .

[31]  Igor Shishkovsky,et al.  Direct Selective Laser Melting of Nitinol Powder , 2012 .

[32]  C. Colin,et al.  Microstructural and mechanical approaches of the selective laser melting process applied to a nickel-base superalloy , 2012 .

[33]  Mihai Stoica,et al.  Processing metallic glasses by selective laser melting , 2013 .

[34]  T. Roisnel,et al.  WinPLOTR: A Windows Tool for Powder Diffraction Pattern Analysis , 2001 .

[35]  F. Klocke,et al.  Consolidation phenomena in laser and powder-bed based layered manufacturing , 2007 .

[36]  H. Maier,et al.  In situ characterization of the deformation and failure behavior of non-stochastic porous structures processed by selective laser melting , 2011 .

[37]  Jean-Pierre Kruth,et al.  Microstructural investigation of Selective Laser Melting 316L stainless steel parts exposed to laser re-melting , 2011 .

[38]  Soumyajit Nayak,et al.  Synthesis of Al-Si Alloys and Study of their Mechanical Properties , 2011 .