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AmeriTi Parts Develops Titanium Alloy Powders That Can be Compressed to Very High Green Density
May 10, 2014
Commercially pure (CP) titanium powder made from sponge is very ductile and will compress to relatively high green strength due to its angular form. On the other hand, TiCP powder made from wrought feedstock has a blocky form and does not hold together very well when pressed. The reasons for this are apparent when comparing the morphology of powder particles made from each process. In the following photos, it is evident that the angular form (Fig. 1) has a higher surface area and irregular shape. The blocky form (Fig. 2) however is quite uniform with significantly less surface area.
The irregularity of sponge powder (Fig. 1) promotes particle agglomeration when in compression and higher strength when vacuum sintered at temperatures above the plastic zone of 1650 F (900 C).
Since alloy powders such as Ti64, Ti3-2.5, Ti6242, or various beta alloys are made from wrought feedstocks, press and sinter is not practical due to the blocky morphology (Fig. 2). To overcome this, AmeriTi Parts has developed compressible alloy powders by combining master alloy with its angular TiCP sponge powder. The following micrograph shows the typical Ti6Al-4V alpha-beta structure by blending TiCP with VAl master alloy powder. This process has been used to successfully produce a wide range of titanium alloys in near net shapes by press and sinter at relatively low cost with very high yields.
UTS = 144 KSI
YS = 136 KSI
%E = 2.0