For the low pressure casting integrated ZL101 Aaluminum alloy rear subframe

microstructure and mechanical properties of the aluminum alloy sub-frame were investigated by metallographic observation

scanning electron microscopy and tensile test.The results show that absence of casting surface defects can be observed with the internal dense structure.The gray-elliptical eutectic Si is distributed in theα-Al matrix

and a small amount of bright white iron-based compounds are distributed in the skeleton at the grain boundary.The tensile strength

yield strength

elongation and hardness of the T6 state aluminum alloy rear subframe reach 304 MPa

245 MPa

8.2% and 99 HB.Durability bench test and vehicle road durability test confirm that the performance of the lowpressure integrated casting rear sub-frame can meet the requirements for the use.