Effect of Hot Extrusion on Microstructure and Properties of Rapidly Solidified Al-Si-Fe-Cu-Mg Alloy
In this paper,rapid solidification Al-20Si-5Fe-Cu-Mg alloy is prepared by single roll spinning quenching method,and observed and analyzed by SEM.The results indicate that rapid solidification can greatly refine the microstructure of Al-20Si-5Fe-Cu-Mg alloy,suppress the precipitation and growth of Si phase and β-Fe phase,and the refinement degree of the microstructure is gradient distribution.Hot extrusion experiments are conducted on rapidly solidified Al-20Si-5Fe-Cu-Mg alloy with different process parameters.The results show that the powder encapsulated hot extrusion process can densify the rapidly solidified Al-20Si-5Fe-Cu-Mg strip alloy.When the extrusion temperature is 400℃and the extrusion ratio is 1∶16,the alloy obtains excellent mechanical properties,with yield strength and compressive strength reaching 456MPa and 805MPa,respectively,and a compression rate of 9.3%.
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