Microstructures and mechanical properties of AEZ611 magnesium alloy extruded during of aging is investigated.The results show that grain size becomes coarse with uneven distribution in the alloy after aged in box-type resistance furnace

while it is refined in oil bathing

which is beneficial for improving the mechanical properties.In addition

mechanical properties and microstructure of the alloy are closely related with temperature.With aging temperature increased to 200 ℃

precipitation velocity of secondary phase is aclelarated with more homogeneous distribution

and fine black pit-shape phase is dispersedly distributed into grain bonundary.With increasing in holding time

precipitates of Al4Ce is increased with unform distribution

which further improves the mechanical properties of the alloy.Mechnical properties of the alloy are related with precipitates

size and morphology of RE phase.With aging at 390 ℃ for 1 h in oil bathing and at 200 ℃ for 20 h

tensile strength

yield strength and elongation of the alloy reach 311 MPa

232 MPa and 11%

respectively.