(1. 北華航天工業(yè)學(xué)院 材料工程學(xué)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(yīng)變速率熱模擬壓縮試驗(yàn)，研究一種擠壓態(tài)組織的阻燃鈦合金在變形溫度900~1150 ℃，應(yīng)變速率0.001~1 s-1條件下的高溫流變應(yīng)力和組織演變，基于熱壓試驗(yàn)數(shù)據(jù)計(jì)算變形激活能。結(jié)果表明：此種阻燃鈦合金流變應(yīng)力-應(yīng)變曲線具有應(yīng)力峰值和流動(dòng)軟化特征，高溫變形是擴(kuò)散控制的過程，軟化機(jī)制以動(dòng)態(tài)回復(fù)為主，但在應(yīng)變速率較高時(shí)會(huì)發(fā)生局部連續(xù)再結(jié)晶，而在應(yīng)變速率較低時(shí)晶界運(yùn)動(dòng)比較明顯。
關(guān)鍵字: 阻燃鈦合金；熱變形；變形機(jī)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
