Effect of Eutectic Silicon Morphology on Tensile Fracture Mechanism of ZL114A Alloy
The effect of Al-10%Sr modification agent on the morphology of the eutectic Si in ZL114A alloy was investigated by using SEM.The cast ZL114A aluminum alloy was prepared using the metal mould casting,and then heat treatde by T6 procedure.The tensile properties,tensile fracture surface and tensile fracture surfaces along longitudinal direction of tested alloy samples were observed and analyzed.The results shown modification element Sr can significantly improve ZL114A-T6 aluminum alloy tensile strength and elongation.Using the 0.03%Sr,ultimate tensile strength and elongation of ZL114A-T6 can be improved from 230 MPa and 1% to the maximum value of 310Mpa and 8% respectively.Observation on tensile fracture surfaces along longitudinal direction of ZL114A-T6 alloy tensile test sampler it was revealed a transgranular fracture mode without Sr modification,but after Sr modification,tensile fracture presented along grain boundary fracture mode.