论文部分内容阅读
为定量测试喷射沉积合金GP区周围的晶格应变的分布,利用喷射成形技术制备了Al12Zn2.4Mg1.1Cu合金。随后对合金进行热挤压、758K固溶2小时和393K时效20小时处理。利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)软件对GP区的结构和应变场进行了测量和分析。结果表明,GP区附近的应变值在各方向差别较大,沿GP区惯习面法线方向的应变最大(εxx=-0.092),与惯习面平行方向上的应变最小(εyy=-0.004)。该项结果可解释GP区附近位错运动的差异:由于应变场在各方向上存在较大差别,产生的应变强化效果不同,导致阻碍位错运动的能力也有所不同。
In order to quantitatively test the distribution of lattice strain around GP zone of spray deposited alloy, Al12Zn2.4Mg1.1Cu alloy was prepared by spray forming technique. The alloy was then hot extruded, solution treated at 758 K for 2 hours and aged at 393 K for 20 hours. The structure and strain field of GP zone were measured and analyzed by using High Resolution Transmission Electron Microscopy (HRTEM) and Geometric Phase Analysis (GPA) software. The results show that the strain values in the vicinity of the GP area are greatly different in all directions, the strain in the normal direction along the GP area is the highest (εxx = -0.092), and the strain in the direction parallel to the habitus surface is the smallest (εyy = -0.004 ). This result can explain the difference in dislocation motion in the vicinity of the GP zone: due to the large differences in the strain field in all directions, strain hardening effects are different, resulting in different resistance to dislocation movement.