INFLUENCE OF HIGH-PRESSURE TORSION ON MECHANICAL PROPERTIES AND MICROSTRUCTURAL EVOLUTION IN 2197 Al-Li ALLOY

2197 (Al-Li-Cu-Zr-Mn) alloy has been processed by High-pressure torsion (HPT) at applied pressure P of 2GPa and different shear strain gamma in the range of 3 turns and 10 turns. Optical microscope (OM) and transmission electron microscope (TEM) provided the detail information of grain size and microstructure of the alloys. Vickers indentation analysis was used to evaluate the micro-hardness of deformed samples. Tension test was employed to obtain the strength ob and elongation delta at room temperature. The result show that nice microstructure and properties are achieved when the pressure is 2GPa and the shear strain gamma is 10 turns, for the grain sizes in the range of 0.1 similar to 0.4 mu m, micro-hardness up to 163HV0.2, and ab at 591.005 MPa and elongation delta of 8.52%, higher than the peak aging treatment (T8) state of 474.7MPa.