【摘要】 采用差热法对Al Zn Mg Cu Li合金在 1 2 0℃× 3 5h +1 6 0℃× 1 0h双级时效过程中的组织转变动力学进行了分析 ,并用动力学理论计算了 η′相的溶解激活能。与相同成分、相同时效制度的Al Zn Mg Cu合金进行比较 ,得出含Li合金的 η′相的溶解激活能是 1 73kJ/mol,不含Li的激活能是 85kJ/mol,前者是后者的 2倍多 ,说明Li增加了 η′相的稳定性更多还原

【Abstract】 Differential scanning calorimetric(DSC)techniques were used to study the kinetics of precipitation and dissolution of η′ phase in the Al Zn Mg Cu Li alloy.Process of aged sample was 120℃×3 5h+160℃×10h.The kinetics parameters for η′ phase dissolution were calculated by using kinetic theory.It is found that activating energy for η′ phase dissolution in Al Zn Mg Cu Li alloy is twice more than that in Al Zn Mg Cu alloy.Above results show that Li improves the stability of η′ phase.更多还原