【摘要】：采用Gleeble—3500熱模擬壓縮試驗機對TA15鈦合金進行等溫恒應(yīng)變速率壓縮實驗,并應(yīng)用材料分析測試技術(shù)(XRD與TEM)和相關(guān)定量計算理論(XRD線形傅氏分析法)分析其熱壓縮變形過程中的位錯演化。結(jié)果表明,TA15鈦合金熱壓縮變形過程中位錯類型主要為柱面(1010)、基面(0002)、錐面(1011)和(110)β面位錯,位錯密度均在1013~1014 cm-2范圍內(nèi)。當(dāng)變形溫度為950℃且變形量為40%時,隨著應(yīng)變速率的提高,柱面(1010)和(110)β面位錯密度幾乎不變;當(dāng)變形量升至60%時,隨應(yīng)變速率的提高,各晶面的位錯密度均顯著降低。當(dāng)應(yīng)變速率為1s-1時,隨變形量的增加,平均晶格應(yīng)變和位錯密度均減小;當(dāng)變形量為60%時,晶格應(yīng)變降到0.116%~0.138%,位錯密度減小到(1.1~1.7)×1014 cm-2。在(α+β)兩相區(qū)出現(xiàn)了由位錯形成的"微觀變形帶"及位錯胞結(jié)構(gòu);在β單相區(qū)板條狀馬氏體α'相內(nèi)部位錯密度較低,形成位錯塞積群,且在位錯塞積群和馬氏體α'相之間形成高度的應(yīng)力集中。
[Abstract]:The isothermal constant strain rate compression experiment of TA15 titanium alloy was carried out by using Gleeble-3500 thermal simulation compression tester. The dislocation evolution during hot compression deformation was analyzed by material analysis and testing technique (XRD and TEM) and correlation quantitative calculation theory (XRD linear Fourier analysis). The results show that the dislocation types are mainly cylindrical (1010), base (0002), cone (1011) and 尾 (110) 尾 dislocations, and the dislocation density is in the range of 1013 ~ 1014 cm-2. When the deformation temperature is 950 鈩，

本文編號：2195532