(1. 北华航天工业学院 材料工程学院，廊坊 065000；
2. 北京航空材料研究院，北京 100095)
摘 要: 通过等温恒应变速率热模拟压缩试验，研究一种挤压态组织的阻燃钛合金在变形温度900~1150 ℃，应变速率0.001~1 s-1条件下的高温流变应力和组织演变，基于热压试验数据计算变形激活能。结果表明：此种阻燃钛合金流变应力-应变曲线具有应力峰值和流动软化特征，高温变形是扩散控制的过程，软化机制以动态回复为主，但在应变速率较高时会发生局部连续再结晶，而在应变速率较低时晶界运动比较明显。
关键字: 阻燃钛合金；热变形；变形机制；组织转变
（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
