The effect of zirconium on structure and mechanical properties of low alloys of the Al-Fe-Si system

摘要

Structure and mechanical properties of Al-Zr-Si system alloys containing 2 percent Si and 1,2 percent Zr have been studied. Solubility of zirconium in aluminum solid solution in the cast state is shown to be able to reach no less than 0,5 percent with silicon content as little as 2 percent inclusive. Little addition of silicon (beginning from 0,2 percent) significantly accelerates strengthening of Al-Zr-alloys because of formation of Al_3Zr metastable phase during annealing Rolling of cast ingots followed by annealing in alloys with 0,5 percent Zr is shown to allow us to reach significantly greater strength as compared with industrial alloys of AA8111 types on the basis of the Al-Fe-Si system, as stipulated by keeping the unrecrystallized structure.