مشخصه یابی ریزساختاری آلیاژ Al-8Fe-1.4V-8Si تحت ریخته گری

Microstructural characterization of squeeze-cast Al–8Fe–1.4V–8Si

مشخصه یابی ریزساختاری آلیاژ  Al-8Fe-1.4V-8Si تحت فرایند ریخته گری فشاری

 

ABSTRACT

This paper investigates the effect of vanadium on the composition and morphology of intermetallics formed during the squeeze casting of Mgmodified Al–8Fe–1.4V–8Si alloy in both monolithic form and as-reinforced with 7.58, 10.52 and 15.68 wt.% SiC particles (SiCp). Iron intermetallics of -Al7(Fe,V)3Si and -Al18Fe11Si phases were predominantly observed in the alloy and composite. SEM studies and the EDX analyses revealed that refinement of Fe-intermetallics and modification of -phases to less deleterious morphologies of -phases has been achieved by vanadium addition of 1.4%. Also, heat treatment enhances V diffusion and SiC particles act as nucleation sites for the formation of finer -intermetallics. Fractographs exhibited cracking of long -phases and partial decohesion of SiCp from the matrix.