科研之友
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摘要
Ti-Al alloys are established as promising candidates for aerospace applications due to their lightweight, good elevated temperature strength, and decent corrosion resistance. In this study, a Ti-51Al (at.%) alloy is fabricated by spray deposition. The effects of temperature and strain rate on the deformation behavior of the spray-deposited Ti-Al alloy are investigated. The microstructural evolution of the Ti-Al alloy with different deformation temperatures is discussed in detail. A strain-dependent constitutive equation was proposed to predict the flow stresses at the elevated temperatures for the spray-deposited Ti-Al alloy. The microstructure of the as-deposited Ti-51Al alloy exhibits a (2)/ lamellar-structure with average size 25 +/- 2 m, due to the high cooling rate observed during solidification. The lamellar structure is embedded on a matrix. The amount of the (2)/ lamellar-structure reduces gradually with increasing the hot deformation temperature. After hot isostatic pressing at 1523 K, the microstructure is mainly comprised of the matrix.
