The Ti fire found in high performance engines promotes the development of b
urn resistant Ti alloys. The burn resistant mechanism of Ti40 alloy is inve
stigated. Ti40 alloy reveals good burn resistance. Its interfacial products
between burning products and the matrix are tenacious, which retard the di
ffusion of oxygen into the matrix. Two burn resistant mechanisms, that is,
fast scatter dispersion of heat and suppression of oxygen diffusion, are pr
oposed.