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Abstract

A preparation method of an Al—Ti—Nb—B intermediate alloy includes following steps. KBF₄ powder, Nb powder, and Ti powder are ball milled to obtain mixed powder, the mixed powder is pressed to obtain a ball-milled block, an Al block is melted to obtain an Al melt, the ball-milled block is added to the Al melt followed by smelting to obtain alloy liquid, and the alloy liquid is cast to obtain the Al—Ti—Nb—B intermediate alloy as a refining agent. A high-energy ball milling process is introduced into the preparation method of the Al—Ti—Nb—B intermediate alloy, improving reaction activity and lowering a reaction threshold. An α-Al grain can be refined to be less than 90 μm due to uniform dispersion of refining nucleation particles of the refining agent, the refining agent has a great refining effect. The preparation method is simple with easy steps and operations, the Al—Ti—Nb—B intermediate alloy has high purity.

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First Claim