论文部分内容阅读
本文研究了真空加热除气处理对快速凝固Al—Li合金粉末表面氧化层厚度和组成,以及对合金力学性能、断口形貌的影响。试验结果表明,由于Li的存在,除气过程中,Li不断向表面迁移,形成Li_2O,还原Al_2O_3,使表面氧化层厚度增加,组成和性质发生变化。除气处理后,虽然粉末颗粒界面结合状况有较大改善,但拉伸性能变化不大,延伸率略有提高,却很不明显。界面析出相Al_3Zr影响粉末界面结合强度。
In this paper, the effects of vacuum degassing on the thickness and composition of the oxide layer on the rapidly solidified Al-Li alloy surface, as well as the mechanical properties and fracture morphology of the alloy were investigated. The experimental results show that due to the presence of Li, Li continuously migrates to the surface during the outgassing, forms Li_2O, and reduces Al_2O_3 to increase the thickness of the surface oxide layer and change its composition and properties. After degassing treatment, although the interface condition of powder particles has been greatly improved, the tensile properties have little change, while the elongation has slightly increased, but it is not obvious. Interfacial precipitation Al_3Zr influence the bonding strength of powder interface.