A291D magnesium alloy semi-solid sizing agent near-liquidus preparation technology

Abstract

The invention discloses an A291D magnesium alloy semi-solid sizing agent near-liquidus preparation technology. The A291D magnesium alloy semi-solid sizing agent near-liquidus preparation technology comprises the following steps of firstly, heating a furnace until the temperature of the furnace reaches 400 DEG C; placing a certain amount of magnesium alloy ingots in a crucible; adding anti-oxidation fusing agents with 1% of magnesium ingots in percentage by weight in the crucible so as to prevent magnesium alloy from being oxidized and combusted; feeding argon gas in the furnace by using an argon gas tube; heating the furnace until the temperature of the furnace reaches 730 DEG C; standing for 30 minutes; cooling down the temperature of the furnace until the temperature of the furnace is equal to testing temperature; and performing casting after standing; accurately controlling the temperature of the inside of the resistance furnace by using a thermocouple and a temperature control cabinet; draining liquid magnesium alloy via a downward flowing tube by ascending and descending a rotary plug stick and molding the magnesium alloy; heating the furnace until the casting temperature reaches 600 DEG C, standing for 1 minute, casting the liquid magnesium alloy in dies at the temperature of 10 DEG C and molding the magnesium alloy; heating the furnace until the casting temperature reaches 594 DEG C, standing for 1 minute, casting the liquid magnesium alloy in the dies at the temperature of 10 DEG C and molding the magnesium alloy; heating the furnace until the casting temperature reaches 590 DEG C, standing for 1 minute, casting the liquid magnesium alloy in the dies at the temperature of 10 DEG C and molding the magnesium alloy; heating the furnace until the casting temperature reaches 585 DEG C, standing for 1 minute, casting the liquid magnesium alloy in the dies at the temperature of 10 DEG C and molding the magnesium alloy; and finally, heating the furnace until the casting temperature reaches 585 DEG C, standing for 10 minutes, 20 minutes, 40 minutes and 60 minutes respectively, casting the liquid magnesium alloy in the dies at the temperature of 10 DEG C and molding the magnesium alloy. The A291D magnesium alloy semi-solid sizing agent near-liquidus preparation technology has the advantages that the ultimate strength and the elongation percentage are greatly improved, and the mechanical property is qualitatively improved.

Description

[0001] technical field [0002] The invention belongs to the technical field of alloy cast iron casting, and in particular relates to a preparation process of an A291D magnesium alloy semi-solid slurry by a near-liquidus method. [0003] Background technique [0004] Compared with traditional forming methods, semi-solid processing technology has many significant advantages. It has been more than 30 years since researchers at the Massachusetts Institute of Technology discovered that metals have semi-solid properties in 1971. Semi-solid research is still a worldwide hotspot. , scholars at home and abroad have done a lot of work, but the development of semi-solid processing technology is not ideal, and it has not been widely used in industrial production. From the perspective of processing process, semi-solid processing increases the process of making various slurries compared with traditional forming. In terms of slurry preparation, a lot of achievements have been made. D...

AI Technical Summary

Problems solved by technology

The equipment of the mechanical stirring method is relatively complicated, the performance of the prepared slurry is unstable, and the structure is uneven, so it is not suitable for mass industrial production

The electromagnetic stirring method is the most widely used in processing, but there are disadvantages such as complicated equipment and high cost of five prepared slurries