Method and device for preparing semi-solid slurry

A method for preparing semisolid slurry comprising:

• placing a molten alloy having a first preset temperature into a slurry vessel, the first preset temperature being 30-120 degrees centigrade higher than a liquidus temperature of the molten alloy;
• in response to the molten alloy having been cooled to a second preset temperature that is lower than the first preset temperature and 20-60 degrees centigrade higher than the liquidus temperature of the molten alloy, starting to perform a stirring process on the molten alloy, the stirring process including:
• stirring the molten alloy using a mechanical stirring rod containing a cooling medium under a first condition, until the molten alloy is cooled to a third preset temperature that is lower than the second preset temperature and 0-10 degrees centigrade lower than the liquidus temperature of the molten alloy, the first condition including:
• a stirring speed of the mechanical stirring rod being a first stirring speed that is in a range from 100 to 400 rpm, and
• a temperature of the cooling medium being a first medium temperature that is in a range from −10 to 48 degrees centigrade;
• and
• continuing to stir the molten alloy using the mechanical stirring rod containing the cooling medium under a second condition, until the molten alloy is cooled to a fourth preset temperature that is lower than the third preset temperature and 10-90 degrees centigrade lower than the liquidus temperature of the molten alloy, the second condition including:
• the stirring speed of the mechanical stirring rod being a second stirring speed that is in a range from 410 to 900 rpm, and
• the temperature of the cooling medium being a second medium temperature that is in a range from 50 to 80 degrees centigrade;
• and
• in response to the molten alloy having been cooled to the fourth preset temperature, stopping stirring and cooling to obtain the semisolid slurry.