Production method for aluminium alloys

Abstract

A production method for aluminium alloys includes an addition process of adding into a molten aluminium alloy a precipitation nucleus on which an intermetallic compound is capable of precipitating when the molten aluminium alloy is solidifying and a casting process of casting the molten aluminium alloy containing the precipitation nucleus into a metal mold. The molten aluminium alloy contains a high density of nuclei consisting of the precipitation nuclei separated from a liquid phase of the molten aluminium alloy and initially nucleated nuclei from the liquid phase of the molten aluminium alloy.

1 . A production method for aluminium alloys comprising;
 an addition process of adding into a molten aluminium alloy a precipitation nucleus on which an intermetallic compound is capable of precipitating when the molten aluminium alloy is solidifying and   a casting process of casting the molten aluminium alloy containing the precipitation nucleus into a metal mold.   
     
     
         2 . The production method for aluminium alloys as described in  claim 1  further comprising
 a temperature keeping process of keeping the molten aluminium alloy containing the precipitation nucleus at a predetermined temperature for a predetermined time, the temperature keeping process to be carried out between the addition process and the casting process. 
 
     
     
         3 . The production method for aluminium alloys as described in  claim 1  wherein adding Be and Mn in addition to the precipitation nucleus into the molten aluminium alloy containing Fe. 
     
     
         4 . The production method for aluminium alloys as described in  claim 1  wherein the precipitation nucleus has a disregistry factor δ defined by a following equation that is equal to or lower than 10%.
   δ (hkl)n   (hkl)s =1/3Σ i=1   3   |d [ uvw ] s   i  cos θ− d [ uvw ] n   i   |/d [ uvw ] n   i ×100 [%]
 
 where, (hkl) s  refers to a low-order index face of a different nucleus particle, [uvw] s  refers to a low-order index direction of the (hkl) s  face, (hkl) n  refers to a low-order degree index face of a metal whose nuclei are generated, [uvw] n  refers to a low-order index direction of the (hkl) n  face, d [uvw] s  refers to a distance between atoms in the [uvw]s direction, d [uvw] n  refers to a distance between atoms in the [uvw] n  direction, and θ refers to a angle between [uvw] s  and [uvw] n . 
 
     
     
         5 . The production method for aluminium alloys as described in  claim 1  wherein the precipitation nucleus is 
     
     
         6 . The production method for aluminium alloys as described in  claim 1  wherein the precipitation nucleus consists of an AlFeSi system intermetallic compound. 
     
     
         7 . The production method for aluminium alloys as described in  claim 1  wherein the precipitation nucleus consists of TiC.