Method for preparing Al-5Ti-1B-1(La+Ce) intermediate alloy grain refiner having different content of lanthanum and cerium

The invention discloses a method for preparing an Al-5Ti-1B-1RE intermediate alloy grain refiner having different content of lanthanum and cerium. The Al-5Ti-1B-1RE intermediate alloy grain refiner is prepared by a fluorine salt reaction method. La and Ce are added into an Al-Ti-B intermediate alloy to generate compounds of Al, Ti, La and Ce, namely, Ti2Al20La and Ti2Al20Ce. By designing Al-Ti-B-(La+Ce) intermediate alloys having different percentage content of lanthanum and cerium, the Al-Ti-B-(La+Ce) intermediate alloy grain refiner having optimal percentage content of lanthanum and cerium is sought. The method has the beneficial effects that second phase particles TiB2, TiAl3, Ti2Al20La and Ti2Al20Ce in the Al-Ti-B-(La+Ce) intermediate alloy grain refiner having optimal percentage content of lanthanum and cerium are fine and uniformly dispersed and meet the usage requirements of sheets or foils; the Al-Ti-B-(La+Ce) intermediate alloy grain refiner having optimal percentage content of lanthanum and cerium, which is prepared by the method, has better grain refining capacity on industrial pure aluminum and alloys thereof than that of the Al-Ti-B intermediate alloy grain refiner at home and abroad under the same conditions.