EFFECTS OF SMALL ADDITIONS OF Mg AND Ag ON PRECIPITATION PROCESS OF Al-Cu-Li-(Mg)-(Ag)-Zr ALLOYS
来源期刊：中国有色金属学报(英文版)1998年第3期
论文作者：Zheng Ziqiao Huang Biping
文章页码：357 - 362
Key words：Al-Li alloys； microstructure； precipitation； silver； magnesium
Abstract: The effects of small Mg and Ag additions on precipitation process of Al-Cu-Li-(Mg)-(Ag)-Zr alloys were studied. The results show that the independent roles of Mg additions are to promote the precipitation of GP zones,θ′andT1phases; the independent roles of Ag additions are to retard the formation of GP zones, stimulate theT1precipitation; the combined additions of Mg and Ag increase and accelerate the precipitation ofT1phases. It is suggested that the strong interaction of Mg with Ag may be favorable to the formation of stacking faults and acting as catalyst for linking Li and Cu atoms required for theT1precipitation. The potent role of independent Mg additions in promoting the precipitation ofθ′is also effective in presence of Ag,but it is weakened due to the strong interaction of Mg with Ag.
