Superplasticity Study of 1420 and 1421 Al-Li Alloys

摘要

A comparative study of superplasticity was performed on two Al-Li alloys, 1420(Al-Li-Mg-Zr), and 1421 (Al-Li-Mg-Zr-Sc). For the as-recieved 1421, superplastic elongations were attained with a maximum elongation of 675 percent. However, less that 170 percent elongation was observed for the alloy 1420. The addition of Sc (.16 to .21 percent) in the alloy 1421 appears to be responsible for the superplastic elongation. Microstructural analysis was performed to find the pertinent mechanisms.