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对一种新型高强Al-Zn-Mg-Cu合金在单级时效过程中的硬度、强度、电导率变化及相应的析出行为进行系统的研究。结果表明,电导率随着时效温度的升高和时效时间的延长而不断增高。在时效开始阶段,硬度和强度随着时效的进行迅速升高并达到峰值。在120°C时效时,硬度和强度到达峰值后保持稳定,主要的析出相是GPI区、GPII区和η′相。在120°C长时间(直至24h)时效后,GPI区和GPII区仍能稳定存在。在160°C时效时,硬度和强度到达峰值后迅速下降。与120°C时效相比,在160°C时效时,析出过程更快。在160°C时效1h后,未观察到GPI区及GPII区的存在,主要的析出相为η′相。在160°C时效24h后,主要的析出相为η相。
The hardness, strength, electrical conductivity and the corresponding precipitation behavior of a new type of high strength Al-Zn-Mg-Cu alloy during single-stage aging were systematically studied. The results show that the conductivity increases with aging temperature and aging time increasing. At the beginning of aging, the hardness and strength rapidly increase with the aging and peak. At 120 ° C aging, the hardness and strength reached its peak and remained stable. The major precipitates were GPI, GPII and η ’phases. GPI and GPII remained stable at 120 ° C for extended periods (up to 24h). When aged at 160 ° C, the hardness and strength drop rapidly after reaching the peak value. The precipitation process is faster at 160 ° C than at 120 ° C. After aging at 160 ° C for 1 h, no GPI and GPII regions were observed. The main precipitates were η ’phase. After aging at 160 ° C for 24 h, the main precipitated phase is the η phase.