Casting of modified al base-si-cu-ni-mg-mn-zr hypereutectic alloys

Abstract From the Canadian patent

An aluminium base-silicon hypereutectic casting alloy with Si 12-15 wt.% has (a) elements A in wt.%, Cu 1.5-5.5 Ni 1.0-3.0, Mg, Fe each 0.1-1.0, Mn 0.1-0.8 Zr 0.01-0.10, Zn 0-3.0, Sn, Pb each, 0-0.2 Cr 0-0.1, Si modifiers Na 0.001-0.01 and/or Sr 0.01-0.10 B(elem.) 0.05x, Ca 0.03x, P 0.05x, others 0.05x each (x = max.); (b) at least one of elements X namely, Cr, Mo, Nb, Ta, Ti, Zr, V and combinations thereof with-without Al, each of, which form stable nucleants such as carbides borides, nitrides, phosphides and combinations thereof subject to the exclusion of AlB , in the presence of modifier Sr (with which it reacts, with, detriment to Al-Si eutectic modification). Each element X is …