A METHOD OF REDUCING THE FORMATION OF PRIMARY PLATLET-SHAPED BETA-PHASE IN IRON CONTAINING AlSi-ALLOYS, IN PARTICULAR IN Al-Si-Mn-Fe ALLOYS

摘要

The present invention is a method for producing an iron-containing hypoeutectic alloy free from primary platelet-shaped beta-phase of the Al5FeSi in the solidified structure by the steps (a) providing an iron-containing aluminum alloy having a composition within the following limits, in weight percent, 6-10% Si, 0.05-1.0% Mn, 0.4-2% Fe, at least one of 1) 0.01-0.8% Ti and/or Zr 2) 0.005-0.5% Sr and/or Na and/or Ba, 0-6.0% Cu, 0-2.0% Cr, 0-2.0% Mg, 0-6.0% Zn, 0-0.1 % B balance aluminum (b) controlling and regulating precipitation path during solidification such that the precipitation of Fe containing intermetallic phases starts with the precipitation of the hexagonal phase of the Al8Fe2Si by (b1) controlling the condition of crystallization by addition of one or more of Fe, Ti, Zr, Sr, Na and Ba within the limits specified in step (a) and (b2) identifying the phases or morphology of the phases that precipitates during the solidification and correct the addition one or more times in order to obtain desired precipitation path and (c) solidifying the alloy at the desired solidification rate.