Mechanical properties
Table 2 lists the strength and elongation of the specimens.
The data show that, after rolling, the tensile strength increases
obviously, while the elongation slightly decreases. Fig. 4 shows
the tensile strength and yield strength variations of as-rolled
Mg-5Li-1Al-0.5Y with three different rolling directions. Along
RD, sheet 1 and sheet 2 possess the similar values of σb and σ0.2,
somewhat higher than that of sheet 3. Along TD, the three
sheets possess the similar σ0.2 values, while sheet 3 possesses a
higher σb than the others. Fig. 5 shows the elongation variation
of the as-rolled alloys along RD and TD, respectively. With the
changing of rolling directions, the elongation of the sheet
slightly decreases. The three sheets all show an inconspicuous
plastic anisotropy along TD and RD.
Combined with Table 2, Fig. 4 and Fig. 5, it can be concluded
that the strength along RD is higher than that along TD.
The tensile strength along RD of the three as-rolled sheets
shows little difference. Along TD, the tensile strength value of
the three specimens are lower than that along RD. The tensile strength of sheet 3 is higher than that of sheet 1 and sheet 2,
almost the same as that along RD. The elongation value of the
three sheets all keeps a high level, and changing rolling directions
shows no significant impact on it. Sheet 3 possesses
almost no anisotropy.