Abstract
The combustion behavior and mechanism of Ti2AlNb alloy are revealed by Promoted Ignition Combustion (PIC) tests and compared with Ti-6.5Al-3.5Mo-1.5Zr-0.3Si (TC11) alloy. Although the ignition temperatures of two alloys show little difference, however, the burning velocity of Ti2AlNb is faster than TC11. Such difference is attributed to different locations of Nb and Mo elements enrichment, and decomposition of O phase in heat affected zone. The location of alloying elements enrichment, and phase transition in heat affected zone should be considered as key factors influencing the burn resistance of Ti2AlNb and TC11 alloys.
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