Effects of hydrogen on the microstructure and mechanical properties of TiAl alloy hydrogenated by plasma were investiagted. The actual hydrogen content measured by the LECO ROH600 hydrogen and oxygen analyzer reach 0.060%. The XRD

SEM

microhardness

room temperature and high temperature mechanical properties

and high temperature deformed microstructures were analyzed for hydrogenated and unhydrogenated TiAl alloys. The results reveal that the phase composition of TiAl alloy with hydrogen is absent change

and it is still γ-TiAl and α

2

-Ti

3

Al. Hydrogen exists in solid solution in the TiAl alloy. After the TiAl alloy is hydrogenated by plasma

the hardness and compressive strength at room temperature are improved. The flow stress during high temperature deformation is decreased

and the degree of material recrystallization is improved

so the deformation presents more uniform.