Method for preparing nanocrystalline magnesium alloy powder

A magnesium alloy and nanocrystalline technology, which is applied in the field of magnesium alloy powder preparation, can solve the problems of easy oxidation of powder, low production efficiency, and long ball milling time, and achieve the effects of difficult oxidation of the tissue, energy saving, low cost, and good thermal stability

Inactive Publication Date: 2008-02-06
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0003] The present invention proposes a method for preparing nanocrystalline magnesium alloy powder, which solves the following problems: 1. The existing mechanical alloying method for preparing nanocrystalline magnesium alloy powder has long ball milling time, easy oxidation of powder, and low production efficiency; Nanocrystalline magnesium alloy powder is prepared by rapid solidification. Due to the limitation of thermodynamic conditions, only a few magnesium alloys with special alloy composition can obtain nanocrystalline structure. For most magnesium alloys, the rapid solidification method can only make the grain fine Thin to 1~3μm

Method used

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Experimental program
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specific Embodiment approach 1

[0010] Specific embodiment one: the steps of the method of this embodiment are as follows:

[0011] Step 1, crushing a magnesium alloy ingot with a weight Mg content of 90-99% and other metal elements of 1-10% into coarse powder, the particle size of which is 1-5mm;

[0012] Step 2, put the coarse powder material in step 1 into a ball mill tank, the ball-to-material ratio is 60:1-120:1, vacuumize, and fill with hydrogen gas of 0.2-1.0Mpa;

[0013] Step 3. Carry out mechanical ball milling under the condition of hydrogen filling, the speed of the ball mill is 250-400r / min, measure the hydrogen pressure in the ball mill tank every 1-3 hours, and ensure that the change of the hydrogen pressure in the ball mill tank is within the range of 0.2-1.0Mpa , the purity of the hydrogen gas filled in the ball mill tank is ≥99.9%. When the hydrogen pressure in the ball mill tank is less than 0.2Mpa, add hydrogen gas to the ball mill tank, and ball mill for 20 to 100 hours to obtain a hydrog...

specific Embodiment approach 2

[0016] Specific embodiment two: The difference between this embodiment and specific embodiment one is that the ball-to-material ratio in step two is 60:1, the pressure in the ball mill tank is 0.2Mpa, and the number of times of vacuumizing and filling hydrogen is 3 times; step three ball mill The rotation speed is 250r / min, the ball milling time is 100h; in step 4, the vacuum dehydrogenation pressure is less than 100Pa, the heating temperature is 280°C, and the heat preservation is 1h. Other steps are the same as those in Embodiment 1.

specific Embodiment approach 3

[0017] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the ball-to-material ratio in step two is 80:1, the pressure in the ball mill tank is 0.5Mpa, and the number of times of vacuumizing and filling hydrogen is 3 times; step three ball mill The rotation speed is 320r / min, the ball milling time is 60h, the vacuum dehydrogenation pressure in step 4 is less than 100Pa, the heating temperature is 310°C, and the heat preservation is 0.75h. Other steps are the same as those in Embodiment 1.

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Abstract

A method for preparing nanocrystalline magnesium alloy powder relates to the preparing method of magnesium alloy powder, which solves the problem that the machinery method prepares the powder with long time of ball milling, easy oxidation and low producing efficiency. In the fast solidify method for preparing the powder, only a very few magnesium alloy with exceptive alloy ingredient can obtain the nanocrystalline due to limit by thermodynamics condition. For most of magnesium alloy, crystal grain only can be refined to a range from 1 um to 3 um. The method of the invention is that magnesium alloy ingot is crushed to rough power, the rough power of the first step is put into a goal agate jar, the goal agate jar is vacuum and charged with hydrogen, the rough power is rub with machine in full hydrogen condition and the hydride state nanocrystalline magnesium alloy powder is dehydrogenated in vacuum by heating to get the nanocrystalline magnesium alloy powder material. The invention integrates the hydrogen processing and the machine goal agate method, therefore, the effect of crystal grain refinement is prominent and nanocrystalline is quickly obtained. The invention has the advantages of good thermal stability of hydride state powder, even organization and uneasy oxidation.

Description

technical field [0001] The invention relates to a preparation method of magnesium alloy powder. Background technique [0002] Magnesium alloy is the light-weight structural material with the lowest density among existing metal materials. It has extremely important application value and broad application prospects in major industrial fields of national defense and national economy such as aerospace, automobile, and communication. However, the existing magnesium alloy materials have low strength and poor plasticity, making it difficult to apply them as high-performance lightweight structural materials. Therefore, improving the strength and plasticity of magnesium alloy materials is the key to expanding the application field of magnesium alloy and promoting the development of magnesium alloy industry. At present, there are mainly alloying methods and fine-grain strengthening methods to improve the strength and plasticity of magnesium alloys. The alloying method of adding allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F9/22
Inventor 胡连喜袁媛武阳王珩王波房文斌李玉平
Owner HARBIN INST OF TECH
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