论文部分内容阅读
将快速凝固２０２４铝合金粉末进行机械球磨，并分别将球磨后的粉末与原始的快速凝固粉末经真空热压制坯及热静液挤压成形。采用透射电镜观察了挤压态及时效状态的微晶２０２４铝合金的组织结构并进行了性能测试。研究结果表明，经过机械球磨后，２０２４铝合金的强度明显提高，并随着球磨时间的增加而增高，延伸率保持在原有水平上，微晶２０２４铝合金的强化机制可能是细晶强化及沉淀强化。此外，由于晶粒细小而导致晶内位错极少，造成明显的拉伸屈服现象，同时材料的加工硬化率降低。
The rapidly solidified 2024 aluminum alloy powder is mechanically ball milled, and the ball milled powder and the original rapidly solidified powder are respectively subjected to vacuum hot pressing and hot hydrostatic extrusion. Transmission electron microscopy was used to investigate the microstructure and properties of 2024 aluminum alloy in extruded and aged state. The results show that after mechanical ball milling, the strength of 2024 aluminum alloy increases obviously and increases with the increase of ball milling time, while the elongation maintains at the original level. The strengthening mechanism of 2024 aluminum alloy may be fine grain strengthening and precipitation strengthen. In addition, due to the small grain caused by very little dislocation within the crystal, resulting in significant tensile yield phenomenon, while reducing the work hardening rate of the material.