A kind of preparation method of carbon nanotube reinforced aluminum alloy semi-solid slurry

Abstract

The invention provides a method for preparing carbon nanotube reinforced aluminum alloy semi-solid slurry, which belongs to the technical field of metal material manufacturing. A method for preparing carbon nanotube reinforced aluminum alloy semi-solid slurry, comprising the following steps: under the condition of melting and casting, after refining Al-Mg-Si alloy to remove slag, under argon protection state, use a bell jar to place Al-CNTs ‑KAlF 4 The intermediate prefabricated block is pressed into the alloy melt, and 2.1-3.2kW high-energy ultrasound is applied during the addition process, and then the temperature is quickly lowered to 610-650°C for heat preservation, and a second high-energy ultrasound is performed for a short time, followed by rapid water quenching. A semi-solid structure with uniform spheroidization is obtained under the process conditions. The invention is safe in operation and stable in process. The structure of the prepared semi-solid slurry is obviously finer than that of the matrix structure without adding the intermediate prefabricated block under the same conditions. The interface between the carbon nanotube and the alloy matrix is ​​well combined, and the distribution of the secondary phase is also 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