显微组织和力学性能的影响
(中南大学 材料科学与工程学院， 长沙 410083)
摘 要: 采用拉伸试验机、光学金相显微镜、 透射电镜、 扫描电镜等设备研究了添加微量Sc对2195铝锂合金应变时效态的显微组织和拉伸性能的影响。结果表明： 微量Sc加入后能生成细小弥散Al3(Sc, Zr)质点，起到抑制再结晶的作用； 微量Sc的加入既促使合金晶内析出的T1相分布更弥散均匀，又能使亚晶界和晶界上析出的T1相变得细小， 几乎不出现明显的晶界无析出带， 因而可在不降低合金强度的前提下有效地改善其塑性。
关键字: 2195铝锂合金； Sc； 显微组织； 力学性能
（School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract:By using tensile tester, OM, TEM and SEM, the effect of trace Sc on microstructure and tensile strength of thermomechanically treated 2195 Al-Li alloy was studied. The results show that addition of trace Sc can make Al3(Sc, Zr) particles distribute dispersively and evenly, and it can strongly retard recrystallization of the alloys and encourage the homogeneous precipitation of T1 phase throughout the matrix without the grain precipitation free zone (PFZ). Therefore, the ductility of the alloys containing trace Sc is improved.
Key words: 2195 Al-Li alloy; Sc; microstructure; mechanical prop
