中断时效处理对AA2024铝合金力学性能和显微结构的影响

发布时间：2018-06-18 05:30

本文选题：AA合金 + 析出　；参考：《中国有色金属学报》2015年12期

【摘要】：采用热电力(TEP)、扫描电镜(SEM)和透射电镜(TEM)等显微表征技术,结合硬度和韧性测试,研究中断时效工艺(IA)对S相为主要强化相的AA2024铝合金的力学性能和显微结构的影响。合金经180℃欠时效处理后,分别在室温和65℃进行低温时效处理即中断时效(T6I4),然后在180℃进行再时效处理(T6I6)。结果表明:相比T6工艺,T6I4工艺处理的合金可以获得较好的韧性,但硬度略有降低;而T6I6工艺会同时降低合金的韧性和硬度。低温中断时效处理时,欠时效过程形成的S相基本不发生变化,合金内部形成的原子团簇可能是T6I4状态韧性提高的原因。T6I6再时效过程中没有形成更多的S相,且原有的S相明显粗化,T6I6峰值时效状态下,合金力学性能变差;AA2024合金中断时效过程中没有析出能够形成S相的形核点。
[Abstract]:The effects of the interruption aging process (IA) on the mechanical properties and microstructure of the AA2024 aluminum alloy with the main strengthening phase of S phase were investigated by means of thermal electric power (TEP), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The effect of IA on the mechanical properties and microstructure of the AA2024 aluminum alloy with the main strengthening phase of S phase was studied at 180 C under aging at room temperature and 65 C, respectively. The results show that the alloy treated by the T6I4 process can obtain better toughness compared with the T6 process, but the hardness is slightly lower than that of the T6 process, while the T6I6 process reduces the toughness and hardness of the alloy at the same time. The S phase formed in the underaging process at low temperature does not change basically when compared with the T6 process. The formation of atomic clusters in the alloy may be the cause of the increase in the toughness of the T6I4 state..T6I6 has not formed more S phase during the re aging process, and the original S phase is obviously coarsened, and the mechanical properties of the alloy become worse under the peak aging state of T6I6, and the nucleation point of the S phase can not be precipitated during the interruption aging process of AA2024 alloy.
【作者单位】：湖南大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51171063,51471067) 湖南省高校科技创新团队项目
【分类号】：TG166.3;TG146.21

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