The compression deformation behavior of semi-solid Y112 aluminum alloy manufactured by semi-solid isothermal treatment has been examined by means of Gleeble-1500 thermal-mechanical simulator in the conditions of different deformation temperatures and different deformation rates. It is found that when the compression strain is less than 0.8

compression stress of semi-solid aluminum alloy is firstly rapidly increased then rapidly decreased with the increase of compression strain. The maximum compression stress of semi-solid aluminum alloy can be observed with the compression strain approximately 0.07 at both different deformation temperaturse and different deformation stresses. In addition

the compression stress can be increased with decreasing in deformation temperature or increasing in deformation rate.