CAJ | 학술논문

通过显微硬度测试、拉伸实验和透射电镜观察,研究不同热处理状态(T6、T8)和微量Zn的添加对Weldalite~(TM)210Al-Li合金显微组织和拉伸性能的影响.结果表明:Weldalite~(TM)210Al-Li合金具有很高的强度,在T6状态下,该合金的主要析出强化相是θ'相、δ'相和T_1相;而在T8状态下,其主要强化相是δ'相和T_1相,预变形促进T_1相的析出,提高T8状态下合金的时效强化效果;微量Zn的添加明显促进T_1相的析出和弥散分布,使合金强度提高,但Zn的加入使合金塑性略有下降.
통과현미경도측시、랍신실험화투사전경관찰,연구불동열처리상태(T6、T8)화미량Zn적첨가대Weldalite~(TM)210Al-Li합금현미조직화랍신성능적영향.결과표명:Weldalite~(TM)210Al-Li합금구유흔고적강도,재T6상태하,해합금적주요석출강화상시θ'상、δ'상화T_1상;이재T8상태하,기주요강화상시δ'상화T_1상,예변형촉진T_1상적석출,제고T8상태하합금적시효강화효과;미량Zn적첨가명현촉진T_1상적석출화미산분포,사합금강도제고,단Zn적가입사합금소성략유하강.
The effects of different aging treatments (T6 and T8) and small additions of Zn on the microstructures and the tensile properties of the Weldalite~(TM)210 alloy were studied by microhardness test, tensile test and TEM. The results indicate that the Weldalite~(TM)210 alloy has high strength. Under T6 condition, the major strengthening phases of the Weldalite~(TM)210 alloy are θ', δ' and T_1 phases. Under T8 condition, the major strengthening phases are δ' and T_1 phases. Predeformation promotes the precipitation of T_1 phase. The higher strength in T8 temper is attributed to high volume fraction of T_1 phase. The small addition of Zn promotes T_1 precipitation and their dispersive distribution, thus increases the strength of the Weldalite~(TM)210 alloy. But the small addition of Zn has unfavourable effect on the ductility of the Weldalite~(TM)210 alloy.