(1. 北華航天工業(yè)學院 材料工程學院，廊坊 065000；
2. 北京航空材料研究院，北京 100095)
摘 要: 通過等溫恒應變速率熱模擬壓縮試驗，研究一種擠壓態(tài)組織的阻燃鈦合金在變形溫度900~1150 ℃，應變速率0.001~1 s-1條件下的高溫流變應力和組織演變，基于熱壓試驗數(shù)據(jù)計算變形激活能。結(jié)果表明：此種阻燃鈦合金流變應力-應變曲線具有應力峰值和流動軟化特征，高溫變形是擴散控制的過程，軟化機制以動態(tài)回復為主，但在應變速率較高時會發(fā)生局部連續(xù)再結(jié)晶，而在應變速率較低時晶界運動比較明顯。
關鍵字: 阻燃鈦合金；熱變形；變形機制；組織轉(zhuǎn)變
（1. North China Institute of Aerospace Engineering, Langfang 065000, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:The hot deformation behavior and structural evolution of a burn resistant titanium alloy were studied on the as-extruded samples in the temperature range of 900-1150 ℃ and the strain rate range of 0.001-1 s-1 through the Gleeble-1500 simulator. The deformation activation energy was calculated based on simulation data. The results show that the stress-strain curves exhibit an obvious peak followed by a broad flow softening in higher strain rate ranges. Hot deformation of the burn resistant titanium alloy is lattice diffusion controlled, and dynamic reversion is the primary softening mechanism, while a typical continuous recrystallization will occur at the higher strain rates, and grain boundary migration will occur at lower strain rates.
Key words: burn resistant titanium alloy; hot deformation; deformation mechanism; microstructure evolution
