Rare earth aluminum-titanium-boron grain refiner and preparation method thereof

Abstract

The invention discloses a rare earth aluminum-titanium-boron grain refiner and a preparation method thereof. The preparation method comprises the steps that raw materials are weighed, and the raw materials comprise aluminum ingots, potassium fluotitanate, potassium fluoborate, sodium chloride, potassium chloride, cryolite, rare earth oxide or rare earth fluoride and calcium metal; after the raw materials are heated to melt the aluminum ingots, mixed salt of the potassium fluotitanate and the potassium fluoborate is added for reaction; stirring is performed until a melt completely reacts, thenslagging-off is performed after heat preservation, and the sodium chloride, the potassium chloride, the cryolite, the rare earth oxide or rare earth fluoride and the calcium metal are added to react;stirring is performed until the melt completely reacts, then refining is performed, slagging-off is performed after heat preservation, and the rare earth aluminum-titanium-boron grain refiner is obtained after casting, wherein the rare earth aluminum-titanium-boron grain refiner is prepared from the following components in percentage by weight: 1.0% to 10.0% of titanium, 0.5% to 5.0% of boron, 0.1% to 5.0% of rare earth and the balance of aluminum. According to the rare earth aluminum-titanium-boron grain refiner and the preparation method thereof, energy consumption in the preparation processof a rare earth aluminum-titanium-boron alloy can be reduced, the cost is reduced, meanwhile, the sizes, shapes and distribution of TiAl3 and TiB2 particles in the refiner are improved, and the grainrefiner with higher refinement performance is obtained.

Description

technical field [0001] The invention belongs to the application technology of aluminum alloys, and in particular relates to a rare earth aluminum titanium boron grain refiner and a preparation method thereof. Background technique [0002] Due to its light weight, excellent cost performance and good comprehensive performance, aluminum alloys have been widely used in the fields of machinery, automobiles, aviation and military industries. To obtain aluminum alloys with excellent comprehensive properties, grain refinement is one of the most important means. The yield strength of the material will increase as the grain size decreases. In addition, the fine equiaxed grain structure can improve the toughness of the material and ensure its good casting performance, surface finish, and excellent processing performance. Therefore, the fine and uniform equiaxed grain structure is the ideal as-cast structure. [0003] The methods to obtain the ideal as-cast structure are divided into ...

AI Technical Summary

Problems solved by technology

However, the most commonly used grain refiner is Al-Ti-B refiner, which has some problems: TiB 2 Particles are easy to aggregate and precipitate and lose the ability to refine; B is prone to poisoning reactions with Cr and Zr and loses the ability to refine; TiB in commonly used refiners 2 Particles, TiAl 3 phase, less than 1% can become effective heterogeneous nucleation cores, and the refinement ability needs to be improved

The first method has severe rare earth metal burning loss and low rare earth yield. The second method has high process energy consumption and high cost due to the long process, and the above two methods are harmful to TiAl in aluminum titanium boron. 3 、TiB 2 The improvement effect of particle shape and size is not obvious