Microstructures and Properties for a Superalloy Powder Mixture Processed by Electron Beam Melting

J. Hernandez, L. E. Murr, K. N. Amato, E. Martinez, P. W. Shindo, C. A. Terrazas, E. Rodriguez, F. Medina, R. B. Wicker, S. J. Li, X. Y. Cheng, F. Yang


The microstructures and residual hardnesses for solid components of 2-phase TiAl (Ti-48Al-2Nb-2Cr in a/o) and Inconel 625 (Ni-19Cr-9Mo-4Nb in w/o) fabricated by electron beam melting (EBM) were compared with a 10:1 blend of TiAl: alloy 625 pre-alloyed powders producing a complex alloy having the composition 48Ti-24Al-9Ni-8Nb-4.5Cr-4Ni (in w/o).  The blended alloy hardness (HV) reached 7.5 GPa in contrast to 1.4 GPa for the Alloy 625 and 4.0 for the 2-phase TiAl alloy.  Reticulated mesh samples and stochastic foam samples prepared from the blended alloy by EBM exhibited a relative stiffness versus relative density plotted on a log-log basis consistent with other reference alloys fitted to a straight line with a slope n = 2 for ideal open cellular materials.

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DOI: http://dx.doi.org/10.5539/jmsr.v1n3p124

Journal of Materials Science Research   ISSN 1927-0585 (Print)   ISSN 1927-0593 (Online)

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