【摘要】 用压力浸渗、小挤压比的挤压以及进一步的轧制这一新的工艺路线，成功地制备了具有高应变速率超塑性行为的β－ＳｉＣ晶须增强纯铝基复合材料该复合材料在温度为８９３～９０３Ｋ、初始应变速率为１．０×１０－２～１．０×１０－１ｓ－１的条件下超塑性变形时，延伸率为２２０％～３８０％差热分析和微结构观察结果表明：除了细小的均匀的微结构，适当的微量液相也是铝基复合材料获得好的高应变速率超塑性的必要条件更多还原

【Abstract】 A beta SiC whisker reinforced pure aluminum composite with high strain rate superplasticity has been successfully developed by a new processing route consisting of pressure infiltration, extrusion with a low extrusion ratio and rolling. The composite exhibited a total elongation of 220%～380% in a wide initial strain rate region from 1.0×10 -2 to 1.0×10 -1 s -1 at temperature of 893～903K. According to differential thermal analysis(DTA) and microstructure observation, it is concluded that an appropriately small amount of liquid phase is necessary to cause a good high strain rate superplasticity in aluminum matrix composites in addition to fine and uniform microstructure.更多还原