【摘要】 利用喷射成形工艺制备了Al1 1 .4Zn2 .6Mg1 .7Cu超高强铝合金材料 ,用金相、SEM、TEM等测试方法对其显微组织进行了分析。研究结果表明 :沉积坯件主要由等轴晶粒构成 ,晶粒平均直径约为 2 3μm ,添加的合金元素Zn ,Mg和Cu呈有规律的分布 ,通过XRD和TEM分析 ,Al1 1 .4Zn2 .6Mg1 .7Cu铝合金沉积坯件中第二相主要包括六方结构的MgZn2 相、四方结构的Al2 Cu相和斜方晶格的Al2 CuMg相。更多还原

【Abstract】 Ultra-high strength Al11.4Zn2.6Mg1.7Cu alloy was prepared by spray forming process. The microstructures of the alloy studied by XRD, SEM, TEM were characterized by equiaxed grains whose average grain size is about 23 μm. SEM analysis results show that the Zn and Cu elements tend to precipitate along the grain boundary. However, the Mg element distributed over the matrix evenly. XRD analysis results indicate that the as-deposited alloy consist of α-Al, MgZn₂, Al₂Cu and Al₂CuMg phases. Under the transmission electron microscope, the MgZn₂ phase could be observed with different appearances such as needle or lump and Al₂CuMg phase could be observed with irregular-shaped appearance.更多还原