中文摘要：

利用喷射成形技术制备了超高强Al12Zn2．4Mgl．1Cu合金。随后对试验合金进行热挤压，758K固溶2h和393K时效20h，利用透射电子显微镜（TEM）对时效后的合金进行形貌、选区电子衍射、高分辨像观察，得到各种沉淀相形貌和析出相与基体的位相关系。经过标定后确定，时效后的合金中存在3种纳米级沉淀相：η’相、GP（II）区、L12－Al3Zr，GP（II）区和Al3Zr与基体共格结合。

英文摘要：

Ultrahigh strength aluminum alloy Al12Zn2.4Mgl. 1Cu was prepared by spray forming method. Then the experiment alloy was processed by hot extrusion. Solid solution treatment at 758 K for 2 h and aging at 393 K for 20 h. The aged alloy was observed by TEM technology including selected area diffraction, conventional and high-resolution imaging. Afterwards the relationship between precipitate phase morphology, precipitate phase and matrix phase was obtained. It is determined that there are three kinds of nano-scale precipitate phase, η＇ phase, GP（II）-zones and L 12-Al3Zr; the interface of GP（II）-zones with L12-A13Z are coherent.