擠壓態(tài)阻燃鈦合金高溫變形行為及機(jī)理

擠壓態(tài)阻燃鈦合金高溫變形行為及機(jī)理Hot deformation behavior and mechanism of as-extruded burn resistant titanium alloy

通過等溫恒應(yīng)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(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(yīng)力-應(yīng)變曲線具有應(yīng)力峰值和流動軟化特征，高溫變形是擴(kuò)散控制的過程，軟化機(jī)制以動態(tài)回復(fù)為主，但在應(yīng)變速率較高時會發(fā)生局部連續(xù)再結(jié)晶，而在應(yīng)變速率較低時晶界運(yùn)動比較明顯。

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.

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