Effects of heat treatment

such as artificial aging（T1）

T5

T6

on microstructure and mechanical properties of high vacuum die casting AlSi10MnMgFe alloy plates were investigated.The results indicate that high vacuum die casting specimens exhibit sound structure and a better mechanical properties compared with conventional die castings.After artificial aging at 170℃for 8hours

the tensile strength and the elongation of the high vacuum die casting specimens reach 351.3MPa and 3.5%

respectively

which is the higher and lower those of the as-cast specimens

respectively.In addition

mechanical properties of the specimens produced are improved after T5and T6heat treatment.After T5 heat treatment

the elongation of the high vacuum die casting specimens is increased to 8.3%

obviously superior to that of as-cast ones.The tensile strength

yield strength

elongation and hardness of the T6 specimens reach 358.4MPa、286.6MPa、6.1%and 110.4

respectively.