(哈尔滨工业大学材料科学与工程学院，哈尔滨 150001)
摘 要: 实验研究了以快速凝固和机械合金化复合工艺制备的2024 铝合金纳米晶粉末为原料，采用热静液挤压工艺在不同挤压工艺条件下固结成形的挤压态材料的显微组织与力学性能，探讨了作为主要工艺参数的挤压温度和挤压比对材料组织性能的影响规律及其原因。在此基础上，进一步确定了2024铝合金纳米晶粉末热静液挤压固结成形时的挤压温度与挤压比的合理取值范围。
关键字: 2024铝合金 纳米晶 静液挤压 晶粒长大 组织性能
（School of Materials Science & Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China）
Abstract:Nanocrystalline 2024 aluminium alloy powders prepared by a unique technique which combines rapid solidification and mechanical alloying together were consolidated under various technical conditions by hot hydrostatic extrusion, and the microstructure and mechanical properties of the consolidated alloy were experimentally investigated. The influence of both the extrusion temperature and the extrusion ratio on the microstructure and mechanical properties of the as-extruded alloy was made clear, and the reasons why these two parameters so influenced the microstructure and mechanical properties of the alloy were also discussed. Furthermore, suggestions were given for rationalizing the extrusion temperature and the extrusion ratio for the consolidation of nanocrystalline 2024 aluminium alloy powders by hot hydrostatic extrusion.
Key words: 2024 aluminium alloy; nanocrystalline; hydrostatic extrusion; grain growth; microstructure and mechanical properties
