Aluminium calcium carbon grain refiner for Mg-Al series magnesium alloy and preparation method and application thereof

A technology of magnesium alloy and refining agent, applied in the field of metallurgy, can solve the problems of large difference, reduced corrosion resistance of magnesium alloy, limited refining effect, etc., and achieves the effect of simple preparation method and easy mass production.

Inactive Publication Date: 2012-07-04
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of impurity element Fe, the corrosion resistance of magnesium alloys is reduced
(3) Adding solute elements method: adding solute atoms (Zr, Ce, La, Sr, Ca) etc. into the melt; Zr element is a very good magnesium alloy refiner, but its application range is narrow and cannot be applied In Al-containing magnesium alloys, the reason is that Zr is easy to form a stable compound A13Zr with the Al element in the alloy, and the A13Zr crystal is the body center Square type, the lattice constant is quite different from that of magnesium, and the effect of effective grain refinement cannot be achieved
[0004] Among the open patents about grain refinement for Mg-Al series magnesium alloys, the Chinese patent with publication number CN1583327A ("grain refinement for magnesium or magnesium alloys Chemical agent and its preparation and use method") involves the technology of using carbon powder (graphite powder) alone as a carbon source and refining magnesium alloys; its technical feature is that after baking aluminum powder and carbon powder at 80-100°C It is an improved carbon powder addition technology; the main problem is that the problem of carbon segregation cannot be overcome in principle, and the refining effect is limited.
[0005] The Chinese patent with publication number CN1410566A ("a refiner for magnesium alloys and its preparation method") relates to the generation of A1 by using carbon powder (graphite powder) alone4C3The technology of crystal nucleus refining magnesium alloy; its technical feature is to mix aluminum powder, graphite powder and magnesium powder evenly, dry and briquette in vacuum or Under the protection of inert gas, heating to 700-1000 ℃ and keeping it warm for more than 25 minutes to prepare a magnesium alloy refiner containing A14C3 crystal nuclei; shortcomings It is the effect of a single refiner, compared with compound refinement, the refinement effect is limited
The main problem is that carbon is easy to segregate, and the particles of Al-Ca or Al-Sr compounds generated are coarse, which is easy to damage the effect of composite refinement

Method used

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  • Aluminium calcium carbon grain refiner for Mg-Al series magnesium alloy and preparation method and application thereof
  • Aluminium calcium carbon grain refiner for Mg-Al series magnesium alloy and preparation method and application thereof
  • Aluminium calcium carbon grain refiner for Mg-Al series magnesium alloy and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Example 1 Aluminum-calcium carbon (Al-Al 4 C 3 -CaAl 2 ) Preparation of grain refiner

[0035] (1) Adopt 70% aluminum powder, 30% calcium carbide powder as raw material powder, put into ball mill, under the protection of high-purity argon, ball mill mixed powder, ball milling speed 300r / min, ball milling time 4 hours;

[0036] (2) Compress the uniformly mixed powder into a mold to obtain a prefabricated block;

[0037] (3) Put the prefabricated block into a heating device protected by high-purity argon (≥99.99%), heat it to 900°C and keep it for 30 minutes, stop heating, and cool it to prepare the aluminum-calcium-carbon grain refiner (Al-Al 4 C 3 -CaAl 2 master alloy).

[0038] (4) After adding 1.0% Al-Ca-C grain refiner to AZ31 magnesium alloy, the grain size of magnesium alloy can be reduced from 150 μm to 60 μm.

Embodiment 2

[0039] Example 2 Preparation of Al-Mg-Ca-C grain refiner

[0040] (1) Use 70% aluminum powder, 20% calcium carbide, and 10% magnesium powder as raw material powder, put them into a ball mill, and ball mill the mixed powder under the protection of high-purity argon, the ball milling speed is 200r / min, and the ball milling time is 5 hours;

[0041] (2) Compress the uniformly mixed powder into a mold to obtain a prefabricated block;

[0042] (3) Put the prefabricated block into a heating device protected by high-purity argon (≥99.99%), heat it to 800°C and keep it for 30 minutes, stop heating, and cool it to prepare the aluminum-magnesium-calcium-carbon grain refiner (Al- Mg-CaAl 2 -Al 4 C 3 master alloy).

[0043] (4) After adding 1.5% Al-Ca-C grain refiner to AZ91 magnesium alloy, the second phase ?-Mg 17 al 12 Significant refinement, the grain size of the magnesium alloy is reduced from 120 μm to 55 μm.

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Abstract

The invention discloses an aluminium calcium carbon grain refiner for Mg-Al series magnesium alloy and a preparation method and application thereof. The grain refiner provided by the invention comprises aluminium, calcium, carbon and magnesium; and by adding the aluminium calcium carbon grain refiner to magnesium alloy melt, fine heterogeneous phase particles, i.e. Al4C3, supply a large number of effective heterogeneous nucleation cores, Ca solute released by dissolved CaA12 (or CaAl4) particles restrains the growth of magnesium alloy grains, and the casting-state magnesium alloy grains are obviously refined and increased in terms of strength and plasticity under the composite refining effect. The grain refiner provided by using the method is a metal block and is convenient to add in the magnesium alloy melt; the addition amount and the component content of the grain refiner are easily controlled; and the purpose of high efficiency refinement can be achieved by adding a trace of grain refiner.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an aluminum-calcium-carbon grain refiner for Mg-Al series magnesium alloys, which can effectively refine the cast magnesium alloy grains by utilizing the refinement effect of the refiner. Background technique [0002] Magnesium alloy is currently the lightest metal structure material, with many excellent unique properties, such as high specific strength, high specific stiffness, good electrical and thermal conductivity, good damping and shock absorption and electromagnetic shielding performance, easy to process and shape, good With the advantages of regeneration and reuse, it has good application prospects in the fields of aviation, automobiles, and communication equipment. Through grain refinement, the comprehensive properties of magnesium alloy strength, plasticity and toughness can be improved, the formability of magnesium alloy can be improved, high-performance magnesium a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/06C22C1/05C22C23/02B22D27/20
Inventor 刘英李卫
Owner JINAN UNIVERSITY
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