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Fining agent used for magnesium alloy and its preparation method

A refiner and magnesium alloy technology, which is applied in the field of metal materials, can solve the problems of high processing temperature, inconvenient process, short duration of effect, etc., and achieve the effect of simple adding process, easy control of refining effect, and easy control of adding amount

Inactive Publication Date: 2003-04-16
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods have problems such as high treatment temperature, short duration of effect, and inconvenient process; in addition, zirconium reacts with alloy elements such as aluminum in magnesium alloys, which makes the refinement effect invalid. Therefore, it has no effect on Mg-Zn- Most magnesium alloys other than (Y) are not applicable; only when carbon-containing gas or carbon-containing substances are introduced into the magnesium alloy and the alloy contains more than 0.5% aluminum can it play an effective refining role

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take by weight 1kg of aluminum powder, graphite powder and magnesium powder in a mass ratio of 92:5:3;

[0016] (2) After drying at 80°C, mix with a ball mill for 40 minutes;

[0017] (3) Press into a cylinder with a diameter of 30 mm and a length of 50 mm with a press, and place it in an argon-protected resistance furnace, leaving a certain gap between the blocks;

[0018] (4) The temperature of the furnace is raised to 850° C. quickly, and after 150 minutes of heat preservation, the power is turned off, and it is naturally cooled with the furnace to obtain a magnesium alloy refiner having a carbon content of 5%.

Embodiment 2

[0020] Take aluminum powder and graphite powder by mass ratio 97: 3, mix according to the method of embodiment one, dry, block, insulate in the electric resistance furnace of argon gas protection, heat preservation temperature is 800 ℃, and heat preservation time is 180 minutes, like this A magnesium alloy refiner containing 3% carbon can be obtained.

Embodiment 3

[0022] Take aluminum powder, graphite powder and magnesium powder according to the mass ratio of 82.5: 12.5: 5, mix according to the method of the embodiment, dry, block, and keep warm in an argon-protected resistance furnace. For 180 minutes, the magnesium alloy refiner containing 12% carbon can be obtained like this.

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PUM

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Abstract

A crystal grain fining agent for Mg-alloy contains Al (72.5-99.8%), C (0.02-20%) and Mg (0-10 %), and is prepared through proportionally mixing aluminium powder, graphite powder and magnesium powder,baking, die pressing, and calcining at 700-1000 deg.C in vacuum or under inertial gas for at least 25 min.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a magnesium alloy refiner for refining magnesium alloy grains and a preparation method thereof. Background technique [0002] In recent years, the application of magnesium alloys in communications, electronics and transportation has developed rapidly, but the hexagonal close-packed crystal structure of magnesium alloys determines its poor plastic deformation ability, and it is extremely important to improve the processing properties of magnesium alloys. Practice has proved that the fine equiaxed grain structure can improve the plastic deformation ability of magnesium alloy. Therefore, refining the grains of magnesium alloys is the key to improving its processing performance and improving its quality. The literature "Metallurgical and Materials Transactions (Metallurgical and Materials Transactions, 2000, 31A: 2895)" studies and summarizes the grain refinement methods o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/20C22C1/06C22C21/00C22C23/00
Inventor 刘相法王振卿边秀房
Owner SHANDONG UNIV
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