【摘要】 实验对含1.5%(w t)L i的A l-Zn-M g-Cu合金在100℃、120℃、140℃、160℃、180℃、200℃六种不同温度下的单级时效动力学过程进行了研究,结果表明,实验合金的峰值时效温度为180℃,不同于目前已研究出的A l-Zn-M g-Cu合金的峰值时效温度(一般在120℃左右),而二者的峰值硬度相当;用TEM对峰值状态的实验合金进行了微观组织分析,分析表明,峰值状态合金的主要强化相为细小弥散的η′相和一些η相,析出相尺寸在10 nm左右,合金中未析出一般含锂铝合金较易析出的δ′相.更多还原

【Abstract】 Precipitation aging behavior of Al-Zn-Mg-Cu alloys containing 1.5wt% Li has been studied by means of transmission electron microscopy and through hardness tests done at 100℃,120℃,140℃,160℃,180℃ and 200℃.Results shows that the peak hardness temperature of the alloy is 180℃,different from that of the other Al-Zn-Mg-Cu alloys,while their peak hardness appears the same.In the precipitation of Al-Zn-Mg-Cu alloy containing 1.5wt% Li there are mainly η′ and η phases whose size is about 10 nm.No δ′ phase is found in it.更多还原