The direct-current simulation burning method was used to investigate the burn-resistant behavior of Ti14 titanium alloy.The results show that Ti14 alloy exhibits a better burn resistance than TC4 alloy(Ti-6A1-4V).Cu is observed to preferentially migrate to the surface of Ti14 alloy during the burning reaction,and the burned product contains Cu,Cu_2O,and TiO_2.An oxide layer mainly comprising loose TiO_2 is observed beneath the burned product.Meanwhile,Ti_2Cu precipitates at grain boundaries near the interface of the oxide layer,preventing the contact between O_2 and Ti and forming a rapid diffusion layer near the matrix interface.Consequently,a multiple-layer structure with a Cu-enriched layer(burned product)/Cu-lean layer(oxide layer)/Cu-enriched layer(rapid diffusion layer) configuration is formed in the burn heat-affected zone of Ti14 alloy;this multiple-layer structure is beneficial for preventing O_2 diffusion.Furthermore,although A1 can migrate to form A1_2O_3 on the surface of TC4 alloy,the burn-resistant ability of TC4 is unimproved because the Al_2O_3 is discontinuous and not present in sufficient quantity. The direct-current simulation burning method was used to investigate the burn-resistant behavior of Ti14 titanium alloy. The results show that Ti14 alloy exhibits a better burn resistance than TC4 alloy (Ti-6A1-4V). Cu is observed to preferentially migrate to the surface of Ti14 alloy during the burning reaction, and the burned product contains Cu, Cu2O, and TiO2.An oxide layer mainly comprising loose TiO 2 is observed beneath the burned product, while Ti 2 Cu precipitates at grain boundaries near the interface of the oxide layer , preventing the contact between O_2 and Ti and forming a rapid diffusion layer near the matrix interface. Reconstituted, a multiple-layer structure with a Cu-enriched layer (Burned product) / Cu-lean layer (oxide layer) / Cu-enriched layer This rapid-diffusion layer configuration is formed in the burn heat-affected zone of Ti14 alloy; this multiple-layer structure is beneficial for preventing O2-diffusion. Still more, although A1 can migrate to form A1_2O_3 on the surface of T C4 alloy, the burn-resistant ability of TC4 is unimproved because the Al_2O_3 is discontinuous and not present in sufficient quantity.