Combustion behavior and mechanisms of Ti2AlNb compared to an α + β Ti alloy

Combustion Behavior and Microstructure of TC17 Titanium Alloy under Oxygen-Enriched Atmosphere

“…% is confirmed in the dendritic phase of the melting zone for the microstructure of the TC17 alloy after combustion, as shown in Table 2. Such a growing solid solubility of dendrite implies that a peritectic transformation, i.e., liquid phase + α phase→TiO, can be engaged in the combustion of the TC17 alloy, which is similar to other typical titanium alloys that contain the α phase, such as TC4 and TC11 in our previous work [14][15][16]. Additionally, the self-accelerating combustion behavior of the TC17 has been observed, as shown in Figure 3.…”

“…Additionally, the self-accelerating combustion behavior of the TC17 has been observed, as shown in Figure 3. Such a phenomenon has also been observed in TC4, TC11, and Ti14 alloy in references [14,15,20], which can be attributed to the extremely high combustion heat of titanium alloys, offering sufficient energy as the driving force for the acceleration of the reactions.…”

“…Many studies on the impact of alloyed elements on the combustion behavior have been conducted to increase the burn-resistance of titanium alloys. Promoted ignition combustion (PIC) methods with varying oxygen pressure and contents have been used to quantitatively study the combustion behavior of the TC4 (Ti-6Al-4V), TC11 (Ti-6.5Al-3.5Mo-1.5Zr-0.3Si), and Ti 2 AlNb alloys [14][15][16]. The combustion velocity of TC4 is higher than that of TC11, which is attributed to the enriched distribution alloying elements close to the interface of the melting zone and matrix, i.e., V for the TC4 alloy and Mo, Zr, and Si for the TC11 alloy [14].…”

“…Although the ignition temperatures of the two alloys show little difference, the combustion velocity of Ti 2 AlNb is faster than that of TC11 alloy. It has been proposed that this difference is related to the different locations of the enrichments of the Nb and Mo elements, and the decomposition of the O phase in the heat-affected zone [15]. In addition to the typical α + β dual-phase titanium alloys, the combustions of the Ti-Cr-V and Ti-Cu alloys are also studied.…”