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TC11合金兩相區(qū)退火對微觀組織與微觀織構(gòu)的影響
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時間：2015-10-24
采用金相、掃描電鏡和電子背散射衍射(EBSD)研究兩相區(qū)退火溫度和時間對熱壓縮態(tài)TC11(Ti- 6.5Al-3.5Mo-1.5Zr-0.3Si)雙相鈦合金組織和微觀取向的影響。
TC11合金兩相區(qū)退火對微觀組織與微觀織構(gòu)的影響Effect of annealing in two-phase field on microstructure and microtexture of TC11 alloy
采用金相、掃描電鏡和電子背散射衍射(EBSD)研究兩相區(qū)退火溫度和時間對熱壓縮態(tài)TC11(Ti- 6.5Al-3.5Mo-1.5Zr-0.3Si)雙相鈦合金組織和微觀取向的影響。結(jié)果表明：初始魏氏組織在850 ℃熱壓縮后被破壞，形成較為細(xì)小、扭折的片層組織，晶粒取向呈非均勻分布；在后續(xù)700和900 ℃退火過程中，α相變形組織和亞結(jié)構(gòu)發(fā)生靜態(tài)再結(jié)晶而轉(zhuǎn)變?yōu)榈容S狀晶粒，晶粒尺寸較退火前的更為細(xì)小，再結(jié)晶程度和等軸組織比例隨保溫時間的延長而增加，片層組織的球化程度、晶粒取向和形貌的均勻性與合金的再結(jié)晶程度相關(guān)。在900 ℃退火時，α相的再結(jié)晶程度較700 ℃退火時的更為明顯；經(jīng)過120 min退火后，合金發(fā)生完全再結(jié)晶，得到較為均勻、細(xì)小的等軸狀組織。
The effects of annealing temperature and time on the microstructure and microtexture of TC11 (Ti-6.5Al-3.5Mo-1.5Zr-0.3Si) titanium alloy pre-deformed by hot working were investigated using optical microscopy, scanning electron microscopy and electron back-scattered diffraction (EBSD). The results show that the initial Widmanst?tten structure is destroyed after hot compression at 850 °C, leading to fine and distorted lamellar structures with non-uniform grain orientation distributions. Upon subsequent annealing at 700 and 900 ℃, the deformed and substructured α phase evolve into refined equiaxed grains due to static recrystallization, while the extent of recrystallization and the proportion of equiaxed grains increase with the annealing time increasing. The globularization of lamellar structures and the heterogeneity of grain morphology and orientations depend on the extent of recrystallization. Compared with that of 700 ℃, annealing at 900 ℃ leads to more extensive recrystallization, and a reasonably homogeneous fully recrystallized microstructure with equiaxed fine grains is achieved after 120 min.
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