it is seen that according to a particular specialization of the process for manufacturing an aluminum alloy of the present invention it is desirable to adjust the amount of the added material such as al 2 o 3 powder according to the silicon content of the aluminum alloy utilized the required minimum quantities of admixtured al 2 o 3 powder which were just sufficient for providing complete alloying without any portions of the nio oxide particles remaining in the finished product and which are presented in table 4 are in fact precisely the quantities of al 2 o 3 powder which are necessary to bring about a complete reaction of the nio powder however even if the quantity of al 2 o 3 powder actually utilized is below the required minimum value for complete alloying without any portions of the nio oxide particles remaining in the finished product nevertheless it is clear that the admixture of such an inadequate amount of al 2 o 3 powder will still have the beneficial effect of promoting the reaction the present inventors also verified that when the quantity of admixtured al 2 o 3 powder was increased the quantity of nio powder that was reacted also increased particularly in cases wherein the quantity of nio powder utilized and also the silicon content of the aluminum alloy utilized are both relatively small the present inventors verified the fact that even if the quantity of al sub 2 o.