A kind of high-strength aluminum alloy material and preparation method thereof

Abstract

The invention provides a high-strength aluminum alloy material and a preparing method thereof. An Al-Mn intermediate alloy and an Al-Cr intermediate alloy jointly act on refined alpha-Al crystal blanks, eutectic silicon clusters and an iron-rich phase, and the problem that an iron phase is rough and in a strip shape in an aluminum alloy, too many eutectic silicon clusters exist, the total crystalgrains rough, and aluminum alloy performance is poor can be solved. On the other hand, the forming temperature of the iron-rich phase can be improved, the solidifying sequence of the iron-rich phase can be changed, the forming temperature of the iron-rich phase is increased to be slightly higher than an alpha-Al matrix from the temperature betweeny alpha-Al and eutectic silicon, a large amount ofAl(MnFe)Si four-element high-temperature mass points can be formed to serve as heterogeneous nucleation cores of the alpha-Al, two intermediate alloys jointly act, components of eutectic points can bereduced, heat stability is higher, and minimum aggregation tendency is achieved. In addition, an aluminum alloy prepared by the method can meet the aluminum alloy lightweight and high strength needsof a vehicle manufacturer.

Description

technical field [0001] The invention relates to the field of aluminum alloy preparation, in particular to a high-strength aluminum alloy material and a preparation method thereof. Background technique [0002] In the automotive field, vehicle designers and manufacturers are constantly striving to improve overall fuel efficiency, and one of the most direct ways to improve fuel efficiency is to reduce the vehicle's structural weight. According to statistics, if the weight of the car is reduced by 35%, the fuel can be saved by more than 30%, the engine output power can be increased by more than 30%, and the carbon dioxide emission can be reduced at the same time, which can save energy and reduce environmental pollution. If the weight of the car is reduced by 25%, the time to accelerate the car to 100KM / hour can be reduced from 10 seconds to 8 seconds; the use of aluminum wheels can reduce the vibration and allow the use of a lighter rebound buffer; Aluminum is to reduce the we...

AI Technical Summary

Problems solved by technology

6XXX alloys have good formability and weldability, and are widely used because of their good corrosion resistance and surface treatment capabilities. However, the extrusion speed of this type of alloy is very slow when extruding thin-walled profiles, which will cause extrusion The production efficiency is significantly reduced. In addition, the refinement and deterioration of the structure in the process of preparing aluminum alloys, the degree of refinement of the grains in the structure will directly affect the yield strength, brittleness, and plasticity of the aluminum alloy. Therefore,

[0003] For example, the patent No. CN106414782A discloses a new type of 6xxx aluminum alloy with an improved combination of properties; another example is U.S. Patent No. 7,182,825, U.S. Patent Application Publication No. 2014 / 0000768 and U.S. Patent Application Publication No. 2014 Continuous casting of 6XXX alloys is described in / 036998, but these prepared 6XXX alloys do not have more detailed treatment for α-Al embryos, eutectic silicon clusters, and iron-rich phases

[0004] In summary, in the field of preparing aluminum alloys, there are still many practical problems that need to be dealt with in practical applications, and no specific solutions have been proposed.

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