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

Hernandez, J.; Murr, L. E.; Amato, K. N.; Martinez, E.; Shindo, P. W.; Terrazas, C. A.; Rodriguez, E.; Medina, F.; Wicker, R. B.; Li, S. J.; Cheng, X. Y.; Yang, F.
July 2012
Journal of Materials Science Research;Jul2012, Vol. 1 Issue 3, p124
Academic Journal
The microstructure and residual hardness for solid components of 2-phase TiAl (Ti-48Al-2Nb-2Cr in a/o) and Inconel 625 (Ni-22Cr-6Mo-2Nb in a/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 44Ti-39Al-7Ni-4Nb-4Cr-2Mo(in a/0) The blended alloy hardness (MV) 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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