發(fā)布時(shí)間：2019-05-29 22:33

【摘要】：采用分級(jí)淬火實(shí)驗(yàn)方法,繪制了2A14鋁合金時(shí)間-溫度-轉(zhuǎn)換率(TTT)曲線(xiàn),利用XRD、TEM、EDS等觀(guān)察分析了合金等溫過(guò)程中的組織變化,結(jié)合Avrami方程研究了等溫過(guò)程中相變動(dòng)力學(xué)。結(jié)果表明合金TTT曲線(xiàn)鼻尖溫度為350℃,淬火敏感區(qū)間為300~400℃。2A14鋁合金過(guò)飽和固溶體在350℃等溫處理時(shí)快速分解,第二相脫溶析出速率達(dá)到最高。鼻尖溫度較大的過(guò)飽和度和較高的擴(kuò)散速率是第二相快速析出和長(zhǎng)大的主要原因。2A14鋁合金淬火過(guò)程中,建議在淬火敏感區(qū)間(300~400℃)提高冷卻速率抑制第二相析出,在其他溫度區(qū)間適當(dāng)降低冷卻速率,以獲得較高的綜合性能。
[Abstract]:The time-temperature-conversion rate (TTT) curve of 2A14 aluminum alloy was drawn by graded quenching experiment, and the microstructure changes of the alloy during isotherm were observed and analyzed by XRD,TEM,EDS et al. The phase transition kinetics in the isotherm process was studied by Avrami equation. The results show that the nose tip temperature of the alloy TTT curve is 350 鈩，

本文編號(hào)：2488277