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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η′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。
Al-12Zn-2.4Mg alloy was prepared by spray deposition technique using high resolution transmission electron microscopy (HRTEM) and geometric phase analysis (geometric phase analysis) in order to study the strain field distribution of 7000-series aluminum alloy precipitation phase. analysis, GPA) technique was used to study the strain field in the precipitated phase (GPII, η ’). The experimental results show that the strain field in the GPII region is compressive, and the extreme value of compressive strain is 7.09%. The strain field in η ’phase is tensile strain and compressive strain, and the ultimate tensile strain is 2.54% The extreme is 2.15%. The strain fields in the GPII region and the η ’phase are also different in different directions, and the strain in the x direction is larger than that in the y direction. GPII area into η ’phase is the process of reducing the strain, the alloy after transformation to achieve a more stable state.