Abstract
Alloys based on intermetallic compounds such as Ti3Al (alpha-two), offer excellent elevated temperature strength and creep resistance. These same properties, however, combined with the susceptibility of the materials to interstitial element contamination, limit the use of “conventional” thermomechanical processing (TMP) in the production of sheet product forms. Plasma spraying of intermetallic alloys offers an alternative, near net shape processing path to produce homogeneous sheet products, having fine grained, equiaxed microstructures. This paper details the microstructural evolution and associted mechanical properties of Ti-24A1-11Nb (at.%) processed to sheet form using RF plasma spraying. The response of the microstructure/tensile properties of the plasma sprayed alpha-two to various controlled heat treatments is discussed.
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