Aluminum-calcium-antimony intermediate alloy nucleating agent and preparation method thereof

Abstract

The invention relates to an intermediate alloy nucleating agent used for refining primary and eutectic Mg2Si grains in aluminum-magnesium-silicon alloy and a preparation method of the intermediate alloy nucleating agent. The chemical mass percent of elements of the aluminum-calcium-antimony intermediate alloy nucleating agent is that aluminum accounts for 60%, calcium accounts for 10-20% and antimony accounts for 20-30%. The preparation method comprises the steps that under the protection of carbon dioxide gas, a certain amount of pure aluminum is fused at the temperature of 700 DEG C, then analuminum-calcium alloy (Al-40Ca) and pure antimony are added into a melt simultaneously, stirring is conducted after complete fusion, and then the mixture is casted into an ingot or extruded into a wire. The intermediate alloy nucleating agent and the preparation method have the beneficial effects that the preparation method is simple, use convenience is realized, the metamorphism effect is stable, the longevity is achieved, and the like.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a method for refining primary and eutectic Mg in aluminum-magnesium-silicon alloys 2 A master alloy inoculant for Si crystal grains and a preparation method thereof. Background technique [0002] Intermetallic compound Mg 2 Si has the advantages of low density, high melting point, high elastic modulus and low thermal expansion coefficient, so it is generally used as a reinforcement of aluminum alloy materials. However, in conventionally cast Al-Mg-Si alloys, the primary Mg 2 Si usually presents as coarse dendrites, which split the matrix and generate stress concentration, which seriously damages the mechanical properties of the alloy and limits its wide application. Although the addition of master alloy modifier can refine the primary, eutectic Mg 2 Si grains, but its shortcomings such as large dosage and poor grain refinement effect limit the application of this technology in ...

AI Technical Summary

Problems solved by technology

However, in conventionally cast Al-Mg-Si alloys, the primary Mg 2 Si usually presents as coarse dendrites, which split the matrix and generate stress concentration, which seriously damages the mechanical properties of the alloy and limits its wide application.

Although the addition of master alloy modifier can refine the primary, eutectic Mg 2 Si grains, but its shortcomings such as large amount and poor grain refinement effect limit the application of this technology in industrial production

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