2.2.1 Nano-indentation
Nano-indentation was applied to characterize the hardness values of the
α-Mg phase and β-Li phase. The nano-indentation test sample was cut by a
precision cutting machine, then it was mechanically ground. After that,
the electrolytic etching was employed to present the microstructure and
distinguish the α-Mg phase and β-Li phase of the material, and eliminate
the residual stress as well. The nano-indentation tests were performed
in KLA iNano, the maximum load and target depth were set as 20000 μN and
1000 nm to make indentations inner α-Mg phase and β-Li phase.