Composite grain finer for Mg-Al alloy and preparation method thereof

A compound refiner and grain technology, applied in the field of grain compound refiner and its preparation, can solve the problems of difficult to accurately control the composition of the refiner, limited refinement effect, easy oxidation, etc., and achieve a significant refinement effect , the composition is easy to control, and the preparation method is simple
CN101774013AInactive Publication Date: 2010-07-14SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2010-07-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a composite grain finer for Mg-Al alloy and a preparation method thereof. The composite finer comprises the following components: 50-60 percent of Al, 1-5 percent of C, 5-10.5 percent of Ca or 5-10.5 percent of Sr, and the balance of Mg. The preparation method comprises the following steps of: melting pure Al under 700-800 DEG C, adding Mg-CA or Mg-Sr intermediate alloy according to the formula, and compensating the insufficient Mg with pure Mg to obtain Al-Mg-Ca or Al-Mg-Sr intermediate alloy melt, cooling the melt to 600-650 DEG C, uniformly dispersing graphite powder into the melt by using a semi-solid stirring method, and casting to obtain the composite grain finer. The finer has the advantages of simple preparation method, easy batch production, easy control of the addition amount, no discharge of pollutant and particularly remarkable fining effect for the Mg-Al alloy with low Al content.
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Description

technical field

[0001] The present invention relates to a grain composite refiner for Mg-Al alloy and a preparation method thereof, in particular to a high-efficiency composite refiner containing graphite and alkaline earth metal (Ca or Sr) for Mg-Al alloy and its preparation method Preparation. Background technique

[0002] Magnesium alloy is the lightest metal structure material. It has the advantages of light specific gravity, high specific strength, good vibration damping, strong electromagnetic shielding, and easy recycling. It is considered to be the most potential development and application in the 21st century. "Material. However, compared with iron and steel materials, the mechanical properties of magnesium alloy materials are still low, and further improving its strength, plasticity and toughness is very important for the promotion and application of magnesium alloys. It is well known that grain refinement is an important way to improve the strength and toughness...

Claims

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