2024alloy was prepared by powder thixo-forming

and effects of solution treatment on its microstructure and mechanical properties were investigated

and the permanent mold cast alloy was analyzed comparatively.The results indicate that microstructure of the powder thixoformed alloy is changed obviously while the microstructural evolution of the permanent mold cast alloy is slower than that of the powder thixoforming due to the large interdendritic eutectic phase during solutionizing at 485 ℃.The tensile strength

yield strength and elongation of the powder thixoformed alloy are increased by 18.6%

20.9% and 287.1%

respectively

compared with those of the permanent mold cast alloy.With solutionizing at 485 ℃for 4h

the tensile strength

yield strength and elongation of the powder thixformed alloy reach 333 MPa

278 MPa and 16.5%

respectively.