Grain refiner suitable for magnesium alloys with different aluminum contents and preparation method of grain refiner

A technology of grain refiner and refiner, which is applied in the field of grain refinement of magnesium alloys, can solve the problems of unstable refinement effect and limited magnesium alloys, achieve remarkable grain refinement effect and promote the process Longer, more easily controlled effect

Active Publication Date: 2022-04-08
DALIAN UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is limited by the type of magnesium alloy, and the refining effect is not stable

Method used

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  • Grain refiner suitable for magnesium alloys with different aluminum contents and preparation method of grain refiner
  • Grain refiner suitable for magnesium alloys with different aluminum contents and preparation method of grain refiner
  • Grain refiner suitable for magnesium alloys with different aluminum contents and preparation method of grain refiner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Preparation of a grain refiner suitable for magnesium alloys with different aluminum contents

[0040] A preparation method for a grain refiner suitable for magnesium alloys with different aluminum contents, specifically comprising the following steps:

[0041] (1) Prepare 500 grams of refiner. Pure Al is used as the matrix; V powder is used as the V source; boric acid (H 3 BO 3 ) as B source and O source; pure Mg as Mg source. In order to compensate for element burning loss during the experiment, an additional 5 wt.% of V source, B source, and O source was weighed to supplement the design components. According to the mass percentage of the chemical composition of the alloy, weigh 450 grams of pure aluminum, 21 grams of V powder, and 57 grams of H 3 BO 3 powder and 15 grams of pure magnesium.

[0042] (2) Melting the Al in the step (1) at 750° C. to 850° C. to obtain an Al melt.

[0043] (3) Mix V powder and H in step (1) 3 BO 3 The powder is dried a...

Embodiment 2

[0045] Example 2: Preparation of a grain refiner suitable for magnesium alloys with different aluminum contents.

[0046] A preparation method for a grain refiner suitable for magnesium alloys with different aluminum contents, specifically comprising the following steps:

[0047] (1) Prepare 500 grams of refiner. Using pure Al and Al-V alloy as the matrix; boric acid (H 3 BO 3 ) as B source and O source; pure Mg as Mg source. In order to compensate for the element burning loss during the experiment, an additional 5wt.% B source and O source raw materials were weighed to supplement the design composition. According to the mass percentage of the chemical composition of the alloy, weigh 400 grams of Al-5V alloy, 50 grams of pure Al, and 57 grams of H 3 BO 3 powder and 15 grams of pure magnesium.

[0048] (2) Melting pure Al and Al-V alloy in step (1) at 750°C-850°C to obtain Al-V melt.

[0049] (3) According to the steps in Example 1, H 3 BO 3 Powder is added to the Al-V...

Embodiment 3

[0050] Example 3: Applying different contents of grain refiners to aluminum-containing magnesium alloys.

[0051] Evaluate the refinement effect of the refiner, the specific method includes the following steps:

[0052] (1) Put 300 grams of pure magnesium in a stainless steel crucible after removing the surface oil and scale, and melt it in a well-type resistance furnace at 730°C to obtain a magnesium melt. Then weigh pure aluminum to stabilize the alloy composition at Mg-3.0wt.%Al (because the subsequent added refiner contains Al, the Al in the refiner is also counted, and the aluminum content should be changed when weighing pure aluminum To stabilize the composition), added to the magnesium melt for 10 minutes, and then cleaned the surface of the melt oxide slag, Mg-3.0wt.%Al melt.

[0053] (2) Weigh 0.2wt.%, 0.5wt.%, 1.0wt.%, 1.5wt.% of the refining agent prepared in Example 2, and add it to the magnesium melt at 730 ° C, and keep it warm for 10 minutes Distribute the ref...

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Abstract

The invention discloses a grain refiner suitable for magnesium alloys with different aluminum contents and a preparation method thereof, and belongs to the technical field of magnesium and magnesium alloy modification. VB2 particle phases and MgAl2O4 particle phases with different particle sizes are dispersed and distributed in the prepared refiner, and can be used as heterogeneous nucleation sites of alpha-Mg in the magnesium alloy solidification process, so that the magnesium alloy is efficiently refined. The grain refiner for the aluminum-containing magnesium alloy has a good refining effect, has universality for magnesium alloys with different aluminum contents, and is high in refinement recession resistance. The prepared refiner has an obvious refining effect on magnesium alloys with different aluminum contents, and has good refinement recession resistance; the preparation method of the refiner is simple and convenient, raw materials are easy to obtain, and the refiner is suitable for large-scale industrial production and application.

Description

technical field [0001] The invention belongs to the field of modification of magnesium and magnesium alloys, and relates to a grain refinement method of magnesium alloys. Background technique [0002] The largest application field of magnesium alloy products is the die casting industry, mainly in the fields of automobile, aviation and 3C. At present, there are many brands of cast magnesium alloys, among which the alloy series used on a large scale in many fields is Mg-Al alloys. Due to its advantages of stable process, low cost, and small burning loss, it is widely used in automobiles, electronics, aerospace and national defense. And other fields have great application value and broad application prospects. Therefore, using economical and efficient means to improve the mechanical properties and casting properties of magnesium alloys is one of the necessary measures to meet industrial needs and broaden the application range of magnesium alloys, and it is also an urgent requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C23/02C22C1/03C22C1/10
Inventor 郝海范文学白玉张兴国
Owner DALIAN UNIV OF TECH
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