Semi-solidified slurry production method, molded body production method, and molded body

Abstract

Provided are: a semi-solidified slurry production method capable of obtaining a semi-solidified slurry having small variation of the solid phase ratio at each part, a molded body production method capable of reducing the variation of the size of crystal grains, and a molded body. The semi-solidified slurry production method comprises: a preparation step of placing a molten metal into a bottomed container; and a stirring step of stirring the molten metal by performing reciprocating movement of a rod placed in the molten metal in a length direction of the rod until a solid phase ratio at any portion of the molten metal in the container reaches 80% or more.

1 . A production method for a semi-solidified slurry including a solid phase and a liquid phase, the production method comprising:
 a preparation step of placing a molten metal into a bottomed container; and   a stirring step of stirring the molten metal by performing reciprocating movement of a rod placed in the molten metal in a length direction of the rod until a solid phase ratio at any portion of the molten metal in the container reaches 80% or more.   
     
     
         2 . The production method for the semi-solidified slurry according to  claim 1 , wherein a position, orthogonal to the length direction of the rod, of the reciprocating movement in the stirring step is different from that of the immediately previous reciprocating movement. 
     
     
         3 . The production method for the semi-solidified slurry according to  claim 1 , wherein
 on a cross-section orthogonal to the length direction of the rod,   a plurality of the rods exist so as to be spaced apart from each other, and   the two adjacent rods are located such that a center of one of the rods is positioned in a circle centered on a center of the other of the rods and having a radius equal to a length which is seven times a thickness of the other of the rods.   
     
     
         4 . The production method for the semi-solidified slurry according to  claim 1 , further comprising an electromagnetic stirring step of stirring the molten metal in the container by electromagnetic stirring after the preparation step and prior to or simultaneously with the stirring step. 
     
     
         5 . A production method for a molded body, comprising a molding step of pressurizing the semi-solidified slurry to deform the semi-solidified slurry to mold the semi-solidified slurry after the semi-solidified slurry is obtained by the production method for the semi-solidified slurry according to  claim 1 . 
     
     
         6 . A molded body which includes primary crystals and eutectic crystals, in which a fiber flow continuously exists, and which is made of a metal, wherein
 when a plurality of eutectic area ratios each of which is a ratio of an area of the eutectic crystals appearing in a field of view on a predetermined cross-section to an area of the field of view are measured for each field of view, a variation coefficient obtained by dividing a standard deviation of the eutectic area ratios by an average value of the eutectic area ratios is 0.15 or less.