摘要
采用拉伸性能、显微组织、化学成分以及扫描电镜组织、电子背散射衍射和织构分析等手段,研究了80mm厚7150-T7751合金厚板不同厚度层纵向和横向的组织和性能。结果表明:80mm厚7150-T7751合金厚板不同厚度层的组织和力学性能有明显的不同,且并非成分宏观偏析造成的;厚板内部的力学性能存在各向异性,且不同厚度层各向异性的特点不同,板材中心层的纵向强度显著比横向强度大,板材1/4厚度层不仅其纵向强度最小而且还小于其横向强度;板材的中心层的轧制变形程度虽小,但固溶时效后的织构却较强;7150-T7751合金具有合适织构的粗大长状再结晶晶粒与细小等轴晶组织匹配时,在沿粗大晶粒长度的方向可获得较高的强度。
The microstructure and property of 80mm thick 7150-T7751 aluminum alloy plate in different layers were investigated by tensile properties, optical microscopy（OM）, composition analysis, scanning electron microscopy（SEM）, electron back-scattering diffracUon（EBSD） and texture tests. The results show that the microstructure and tensile property in different layers of 7150-T7751 aluminum alloy of 80mm thick are inhomogeneous and the inhomogeneity has no correlation with macrosegregstion of the composition. The tensile property show obvious anisotropy in the plate and the characteristics of anisotro- py at different layers are different. The strength of the rolling direction at the center is higher than that of the transverse direction. The strength of the rolling direction at the quarter is the smallest and is lower than that of the transverse direction. The texture of solution and ageing plate is stronger although the rolling deformation degree is smaller at the center of plate. The higher strength can be obtained along the long direction of coarse grain when the coarse and long recrystallization grains and the fine equiaxed grains are matching in 7150-T7751 aluminium alloy plate.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2013年第2期144-148,共5页
Chinese Journal of Materials Research
基金
国家"十一五"科技支撑计划2007BAE38B06资助项目~~
