Micro-alloying Effects of Mn in 2297 Al-Li Alloy

作者：Sang Fengjian^*; Zheng Ziqiao; Wang Haijin

来源：Rare Metal Materials and Engineering, 2018, 47(3): 871-877.

• 2297 Al-Li alloy
• Mn
• Al3Zr
• recrystallization

The effects of trace Mn addition on microstructure and mechanical properties of 2297 Al-Li alloy were investigated by optical microscopy, tensile test, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) fitted with high-angle annular dark field detector (HAADF). The results show that Mn exists in the form of AICuMn rod-like disperse particle and Al(CuMnFe) coarse phase in the 2297 alloy. In addition, the Al(CuMnFe) phases in 2297 alloy are uniformly distributed and the size of the coarse particles is smaller than that in Mn-free alloy. As a result, the ultimate tensile strength of 2297 alloy is enhanced. The addition of Mn has no influence on the precipitation behavior of Al3Zr particles. And although the AICuMn rod-like dispersed phases are precipitated, the level of recrystallization in 2297 alloy is not changed.

• 出版日期2018-3
• 单位中南大学