K2 ZrF6 was used as modifiers for the modification treatment of ZL114 Aalloy

and influences of varied modification temperature on the microstructures and tensile properties of ZL114 Aalloy were investigated.The results show that

with the increase of modification temperature

the modification effect is increased firstly and then decreased

and the optimized modification temperature of ZL114 Aalloy is 725 ℃.Under the conditions

theα-Al phase exhibits the euiaxed structure with small grain size

and eutectic silicon phase presents mainly thin fibrous or short-rod.Meanwhile

the yield strength

tensile strength and elongation of as-cast ZL114 Aalloy reach 151 MPa

176 MPa and 4.3%

which are increased to 251 MPa

300 MPa and 5.0% after T6 heat treatment

respectively.