Preparation method of carbon nanotube reinforced aluminum alloy semi-solid slurry

Abstract

The invention provides a preparation method of carbon nanotube reinforced aluminum alloy semi-solid slurry, and belongs to the technical field of metal material manufacturing. The preparation method of the carbon nanotube reinforced aluminum alloy semi-solid slurry comprises the following steps of under the casting condition, enabling Al-Mg-Si alloy to be refined and subjected to slag removal, pressing an Al-CNTs-KAlF4 intermediate precast block into an alloy melt through a bell jar in the argon protection state, applying 2.1-3.2 kW high-energy ultrasound in the adding process, then rapidly reducing the temperature to 610-650 DEG C, performing heat preservation, performing short-time secondary high-energy ultrasonic treatment, then performing rapid water quenching, and finally preparing a semi-solid structure which is uniformly spheroidized under an optimal process condition. The preparation method is safe to operate and stable in process, the structure of the prepared semi-solid slurry is obviously refined compared with the structure of a matrix without an intermediate precast block under the original same condition, the interface bonding of the carbon nanotubes and the alloy matrix is good, and the distribution of a secondary phase is more uniform.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacture, and in particular relates to a preparation method of carbon nanotube reinforced aluminum alloy semi-solid slurry. Background technique [0002] In recent years, a green and low-carbon lifestyle has been vigorously advocated, and scientific exploration is also trying to find a breakthrough in green development. At present, cars are becoming more and more personalized, and additional devices further increase the weight of the car body. Therefore, lightweight parts are an inevitable choice for car companies to achieve the goals of reducing body weight and exhaust emissions. For this reason, more and more body parts are gradually replaced by aluminum alloy parts, such as cylinder blocks, cylinder heads, wheels, transmission housings and other shell parts, as well as body panels such as doors, engine covers, and roof covers. However, pure aluminum alloy sometimes cannot fully meet ...

AI Technical Summary

Problems solved by technology

Among them, the mechanical stirring method has the following disadvantages: the molten metal is easily polluted and corroded by the stirrer, and there is a blind zone of stirring, resulting in insufficient uniformity of the slurry, and the stirring process is easy to get involved in gas and inclusions, which in turn affects the quality of the semi-solid billet

Among them, the electromagnetic stirring method has the following disadvantages: the stirring equipment is relatively expensive, the electromagnetic gap of the device is large, and the magnetic flux leakage is serious, and part of the energy cannot be used for stirring the metal melt, which greatly increases the production cost.

Among them, the strain-induced melt activation method has the following disadvantages: an additional pre-deformation process is required, the cost is increased, and the size of the prepared semi-solid green body is small

The near-liquidus method has the following disadvantages: the preparation cycle is long, and it is difficult to accurately control the pouring temperature of the melt