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Method for preparing magnesium and magnesium alloy composite grain refiner

A compound crystal and refiner technology, applied in the field of metal materials, can solve the problems of difficult control of process operation, incapable of quantitative analysis, high equipment requirements, etc., achieve good anti-fading ability, improve corrosion resistance and plastic deformation ability, and prepare process easy effect

Inactive Publication Date: 2009-07-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A certain amount of Al can be obtained by melt contact reaction method, mechanical alloying and self-propagating high-temperature synthesis 4 C 3 , but these process operations are not easy to control, and cannot quantitatively analyze Al 4 C 3 Content
Synthesis of Al by Controlled Atmosphere Isothermal Heat Treatment 4 C 3 Particles have certain advantages, but require higher equipment

Method used

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  • Method for preparing magnesium and magnesium alloy composite grain refiner
  • Method for preparing magnesium and magnesium alloy composite grain refiner
  • Method for preparing magnesium and magnesium alloy composite grain refiner

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Example 1: Mg-20%Al 4 C 3 Preparation of -15%Ce Composite Grain Refiner

[0042] (1) 60% by weight of aluminum powder, 20% of carbon powder and 20% of magnesium powder were dry-mixed on a mixer for 12 hours, then cold-pressed into a prefabricated block with a relative density of 45%, wrapped with aluminum foil Dried and buried in a corundum crucible;

[0043] (2) Use a box-type resistance furnace for isothermal treatment at 900°C for 120 minutes;

[0044] (3) Take out the prefabricated block and make Mg-80%Al 4 C 3 master alloy;

[0045] (4) The Mg ingot of 15% by weight, the Mg-80%Al of 25% 4 C 3 Master alloy and 60% Mg-25% Ce master alloy are remelted to produce Mg-20% Al 4 C 3 -15% Ce composite grain refiner.

[0046] (5) After adding 1.5% of the composite grain refiner to the AZ91 magnesium alloy, the grain size of the alloy can be reduced from 96 μm to 53 μm.

example 2

[0047] Example 2: Mg-25%Al 4 C 3 Preparation of -12%Ce Composite Grain Refiner

[0048] (1) 37.5% by weight of aluminum powder, 12.5% ​​of carbon powder and 50% of magnesium powder were dry-mixed on a mixer for 6 hours, then cold-pressed into a prefabricated block with a relative density of 50%, wrapped with aluminum foil Dried and buried in a corundum crucible;

[0049] (2) Use a box-type resistance furnace for isothermal treatment, and hold at 700°C for 30 minutes;

[0050] (3) Take out the prefabricated block and make Mg-50%Al 4 C 3 master alloy;

[0051] (4) The Mg ingot of 2% by weight, the Mg-50%Al of 50% 4 C 3 Master alloy and 48% Mg-25% Ce master alloy are remelted to produce Mg-25% Al 4 C 3 -12% Ce composite grain refiner.

[0052] After adding 0.5% of the composite grain refiner to the AZ91 magnesium alloy, the grain size of the alloy can be reduced from 96 μm to 58 μm.

example 3

[0053] Example 3: Mg-40%Al 4 C 3 Preparation of -7%Ce Composite Grain Refiner

[0054] (1) The aluminum powder that is 48% by weight, the carbon powder of 16% and the magnesium powder of 36% are cold-pressed into the prefabricated block of relative density 48% after 8 hours on the mixer, dry after wrapping with aluminum foil processed and buried in corundum crucibles;

[0055] (2) Treat isothermally at 780°C for 60 minutes in a box-type resistance furnace;

[0056] (3) Take out the prefabricated block to make Mg-64%Al 4 C 3 master alloy;

[0057] (4) Mg ingot of 9.5% by weight, Mg-64%Al of 62.5% 4 C 3 Master alloy and 28% Mg-25% Ce master alloy are remelted to produce Mg-40% Al 4 C 3 -7% Ce composite grain refiner.

[0058] After adding 1.0% of the composite grain refiner to the AZ91 magnesium alloy, the grain size of the alloy can be reduced from 96 μm to 56 μm.

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Abstract

The invention provides a magnesium and magnesium alloy composite grain refiner and a preparation method thereof. The chemical composition of the refiner is (percentage by weight): 15-37.5% aluminum, 5-12.5% ​​carbon, 5-20% cerium, and the balance is magnesium. The preparation method of the refiner is as follows: dry-mix aluminum powder, carbon powder and magnesium powder, briquette and dry them, place them in a corundum crucible and fill them with refractory powder, and heat them in a box-type resistance furnace at 700-900°C Mg-Al4C3 is obtained by isothermal treatment for 30-120 minutes, and then remelted with magnesium ingot and Mg-25%Ce master alloy to finally prepare Mg-Al4C3-Ce composite grain refiner. The method is easy to operate and easy to industrialized production, and the prepared compound refiner is easy to control the content and easy to add, and can obviously refine the crystal grains of magnesium and magnesium alloys.

Description

technical field [0001] The invention relates to metal materials, in particular to a magnesium and magnesium alloy composite grain refiner and a preparation method thereof. The prepared composite grain refiner can effectively refine magnesium and magnesium alloy alloy crystal grains. Background technique [0002] The industrial application of magnesium alloys began in the 1930s. At present, magnesium alloys have been widely used in the transportation industry and 3C electronic products, and the global magnesium consumption is growing rapidly at a rate of 20% per year. This is an important aspect of modern engineering metal materials. It is unprecedented in application, therefore, magnesium alloy is known as the green engineering material with the most development and application potential in the 21st century. However, magnesium alloy has a close-packed hexagonal crystal structure with few slip systems, which makes it difficult to plastically deform. In addition, the surface ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C1/03
Inventor 刘生发康柳根刘林艳
Owner WUHAN UNIV OF TECH
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