Method for preparing semi-solid aluminum alloy slurry at high efficiency and low cost

Abstract

The invention discloses a method for preparing semi-solid aluminum alloy slurry at high efficiency and low cost. The method comprises the following steps: (1) heating an aluminum alloy ingot by adopting various heating methods in the prior art to prepare a low super-heat melt body; keeping the temperature of 36-42DEG C over a liquid phase line to prepare the low super-eat melt body which is uniform and constant in chemical components and has less or no segregation; (2) transferring the low super-heat melt body prepared in the step (1) to a low-temperature resistance furnace, and preserving temperature to ensure that the temperature of the melt body is uniform; (3) pouring the low super-heat melt body which is subjected to heat preservation in the low-temperature resistance furnace in the step (2) to a stirring crucible, putting the stirring crucible to an inner cavity of an electromagnetic stirrer, and beginning to carry out electromagnetic stirring by adopting a bidirectional electromagnetic stirring method to prepare semi-solid slurry. According to the method disclosed by the invention, a novel electromagnetic stirring technology, namely the bidirectional electromagnetic stirring method, for preparing a semi-solid alloy is developed, and large speed difference and inertial impact generated by the movement inertia of the melt body are sufficiently utilized, so that the stirring efficiency is greatly improved, and uniform distribution of a solid phase in the semi-solid aluminum alloy is facilitated.

Description

technical field [0001] The invention relates to the fields of material technology and the like, in particular to a high-efficiency and low-cost method for preparing semi-solid aluminum alloy slurry. Background technique [0002] Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. With the rapid development of industrial economy, the demand for welded structural parts of aluminum alloy is increasing day by day, so that the research on weldability of aluminum alloy is also in-depth. [0003] Aluminum alloy has low density, but relatively high strength, which is close to or exceeds high-quality steel. It has good plasticity and can be processed into various profiles. It has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and its usage is second only to ...

AI Technical Summary

Problems solved by technology

This method has relatively large limitations, one is that the suitable grain refiner is extremely limited, and the other is that the preparation process is long and the efficiency is low

[0010] Low superheat casting, also known as (near) liquidus casting, is through low superheat pouring and overall pressurization effect, so that the entire alloy liquid enters a supercooled state at the same time, and realizes simultaneous nucleation and simultaneous growth, but it can only be used For the forming of simple structural parts, and the production efficiency is low

[0011] In addition, the preparation methods of semi-solid slurry include spray deposition method, deformation mutagenesis activation method, turbulent flow effect method and various powder metallurgy methods (including single and double air flow atomization, high-speed rotary cylinder atomization, electro-hydrodynamic atomization, etc.), etc., but are all limited by the preparation efficiency and preparation cost, and cannot be used in large-scale production