An efficient method for grain refinement of aluminum and aluminum alloys

Abstract

The invention relates to the field of metal materials, in particular to an efficient method for refining grains of aluminum and aluminum alloys, by which the grains of aluminum and aluminum alloys can be efficiently refined. The method includes the following steps: 1) adding aluminum or aluminum alloy ingots into two crucibles respectively, heating and melting, and heating up to 680-850 ° C; 0.008% to 0.06% of B by body weight is added to the above two melts in the form of Al-Ti alloy (or pure Ti) and Al-B alloy respectively, stirred and kept for 10 to 30 minutes; The melt is poured into another crucible, and the two melts are fully mixed; 4) The temperature of the mixed melt is adjusted to 700°C ± 20°C, and the temperature is kept for 5-60 minutes; 5) The mixed melt is poured into the mold for cooling Solidifies to form an aluminum or aluminum alloy ingot with fine grain size. The grain refining method for aluminum and aluminum alloys of the present invention has the advantages of low cost, simple process, high grain refining efficiency, stable grain refining effect, and the like.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to an efficient aluminum and aluminum alloy grain refining method, which can efficiently refine the aluminum and aluminum alloy grains. Background technique [0002] Aluminum and aluminum alloys have the advantages of light weight, corrosion resistance, high specific strength, and excellent electrical conductivity, and have great application prospects in aerospace, transportation, and electric power transportation. Previous studies have shown that the grain refinement of the solidification structure is very important whether it is cast aluminum alloy or deformed aluminum alloy. From the perspective of alloy properties, aluminum alloy castings composed of fine and uniform equiaxed grains have high strength, high plasticity and excellent subsequent deformation processing performance; from the perspective of casting defects, grain refinement can greatly reduce element segregation , Redu...

AI Technical Summary

Problems solved by technology

However, at present, the fluorine salt reaction method is often used in the industry to prepare Al-Ti-B alloys. When using this method to prepare the refiner, the reaction time between the fluoride salt and the aluminum melt is relatively long, and the heterogeneous core particles TiB 2 Continuous nucleation and growth, TiB in the alloy 2 The particle size distribution is broad, which leads to TiB 2 The particle utilization rate is low, and the refinement effect is limited

In addition, Al-Ti-B alloys usually have some TiB with a size of several microns or more 2 Particles and larger TiB 2 Particle clusters, using such a refining agent to refine aluminum and aluminum alloy melts according to the traditional refining process, may bring serious harm to the subsequent processing of alloy ingots, such as causing aluminum and aluminum alloy thin plate structural parts Surface scratches, streak defects, etc.

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