摘要
研究了稀上元素对１４２０铝锂合金在不同时效状态下的力学性能和显微组织的影响，并与不含稀土元素的１４２０合金进行了比较。结果表明：添加微量稀土元素可以阻碍合金的再结晶，细化再结晶晶粒，并促进δ＇相在时效过程中的弥散析出。采用４６５℃固溶，２％预拉伸变形后经１７０℃，２～６ｈ时效，可使含微量稀土元素的１４２０合金获得较好的强度塑性。
Addition of minute amount of cerium has been successful in improving properties of allots 2090 (Al- Li- Cu) and 8090 (Al- Li- Cu- Mg). Now we report on our preliminary success in improving Russian alloy 1420 (Al- Li- Mg) with addition of minute amount of cerium.From experience, we select two minute additions of cerium: 0. 06wt % and 0. 15wt%.We select two temperatures for aging: 120℃ and 170℃. Fig. 1 (a ) shows variations of σb.σ0.2 and δ with hours of aging at 120℃ and curves 1, 2 and 3 correspond to cerium addition of 0, 0. 06wt%, 0. 15wt% respectively. Fig. 1(b) is similar but for 170℃. Study of Fig. 1appears to show that we should select 170C and cerium addition between 0. 06wt % and 0.15wt% and time of aging between 2h and 6h in order to obtain the improvements in mechanical properties that we choose.Minute addition of cerium to Russian alloy 1420 leads to important microstructural changes in the alloy. Fig. 3 (b) for 0. 06wt% and 3(c) for 0. 15wt% show finer grains as compared with Fig. 3 (a) for the Russian alloy 1420. Fig. 4 (b) for 0. 06wt% and 4(c) for 0.15wt% show the precipitated phase of strengthening hi improved as compared with Fig. 4(a) for the Russian alloy 1420.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
1996年第2期185-189,共5页
Journal of Northwestern Polytechnical University
关键词
稀土元素
时效
力学性能
显微组织
铝锂合金
Al- Li- Mg alloy, cerium, aging, mechanical properties, microstructure
