中文摘要：

为了研究7000系铝合金时效析出相的应变场分布，利用喷射沉积技术制备了Al-12Zn-2．4Mg合金，使用高分辨透射电子显微镜（high resolution transmission electron microscopy,HRTEM）和几何相位分析（geometric phase analysis，GPA）技术对时效析出相（GPII区、η′相）的应变场进行了研究。实验结果表明：GPII区内的应变场为压应变，产生的压应变极值为7．09％；η＇相内的应变场为拉应变和压应变，产生的拉应变极值为2．54％、压应变极值为2．15％。GPII区和矿相的应变场在不同方向上分布也是不同的，x方向的应变较y方向更大。GPII区转变为，η’相是应变能降低的过程，转变后合金达到较稳定的状态。

英文摘要：

In order to investigate the strain field of precipitates in 7000 series aluminium alloy, an Al-12Zn-2.4Mg alloy was prepared by aspray deposition technique. Strain fields of precipitates （GP II zone and η＇ phase） were studied using high resolution transmission electronmicroscopy （HRTEM） and the geometric phase analysis （GPA） technique. Results show that strain mainly concentrates within the GP IIzone and η＇ phase, the GP II zone core is compressive strain, and the η＇ phase produces tensile strain and compressive strain. The largestcompressive strain value of GP II zone is 7.09%, and the largest tensile strain value and the largest compressive strain value of η＇ phase are2.54% and 2.15%, respectively. The strain field of the GP II zone and η＇ phase are inhomogeneous along x and y directions, and the strainofx direction is greater than that of the y direction. The GP II zone transformation to η＇ phase is the process of strain energy reducing, andthe alloy reaches a more stable state after the changing.