Preparation method of superfine crystal inoculating agent for aluminum alloy grain refinement

Abstract

The invention provides a preparation method of a superfine crystal inoculating agent for aluminum alloy grain refinement and relates to aluminum-based alloy and is a method for preparing nano-crystalline Al-Ti-B-Re thin-strip intermediate alloy by a rapid solidification technology of metal, wherein the method comprises steps as follows: proportioning 5-5.4% of Ti, 1-1.04% of B, 1-1.2% of Ce, 0.05-0.2% of La and the balance of Al according to determined ingredients; weighing raw materials Al-5Ti-1B intermediate alloy and lanthanum cerium alloy to proportion the materials; melting in vacuum to obtain blocky Al-5Ti-1B-1Re intermediate alloy; carrying out rapid solidification to obtain the superfine crystal inoculating agent for the aluminum alloy grain refinement, wherein the superfine crystal inoculating agent is the nano-crystalline Al-5Ti-1B-1Re intermediate alloy. With the adoption of the method provided by the invention, adverse impact of needlelike TiAl3 on the matrix structure is eliminated, nucleating particles TiAl3 with thinner size and more dispersed distribution are obtained, and superfine nucleating particles are realized.

Description

technical field [0001] The technical solution of the invention relates to an aluminum-based alloy, in particular to a method for preparing an ultra-fine grain inoculant used for grain refinement of an aluminum alloy. Background technique [0002] At present, grain refinement is one of the important means to obtain aluminum alloys with excellent properties. Among all grain refinement means, adding grain refiner to aluminum melt is recognized as the simplest and most effective. Al-5Ti-1B master alloy has been widely used as a refiner in the aluminum industry. This refiner has a good refinement effect, but it also has many defects: first, TiB 2 Particles are easy to aggregate and precipitate in the aluminum melt, so that the refining effect gradually declines over time (Limmaneevichitr C, Eidhed W. Mater Sci Eng A 2003; A349:197-206; Whitehead AJ, Danilak SA, Granger DA, Huglen R (Ed.), Light Metals, The Minerals, Metals & Materials Society, Warrendale, PA, 1997). In additio...

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Problems solved by technology

Al-5Ti-1B master alloy has been widely used as a refiner in the aluminum industry. This refiner has a good refinement effect, but it also has many defects: first, TiB 2 Particles are easy to aggregate and precipitate in the aluminum melt, so that the refining effect gradually declines over time (Limmaneevichitr C, Eidhed W. Mater Sci Eng A 2003; A349:197-206; Whitehead AJ, Danilak SA, Granger DA, Huglen R (Ed.), Light Metals, The Minerals, Metals & Materials Society, Warrendale, PA, 1997)

However, in the master alloys prepared by the above-mentioned processes, the nucleation particles TiAl 3 The size is about ten to tens of microns, and TiAl 3 It is mainly distributed on the aluminum substrate in the form of irregular blocks and needles

For acicular TiAl 3 As far as it is concerned, once it precipitates on the grain boundary, the matrix will be severely split, resulting in a sharp deterioration of the mechanical properties of the aluminum alloy.

In addition, TiAl 3 Belongs to the brittle phase, a large amount of massive TiAl 3 Distributed on the substrate, it will make the material brittle, which is also not conducive to the improvement of mechanical properties

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