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A preparation method of in-situ mgo dispersion strengthened ultrafine-grained al-mg alloy

A technology of dispersion strengthening and in-situ generation, which is applied in the field of powder metallurgy, can solve the problems of low material strength and elastic modulus, easy agglomeration of second phase particles, etc., and achieve simple equipment, easy realization of parameters, and high elastic modulus. Effect

Active Publication Date: 2019-09-27
NORTHEASTERN UNIV LIAONING
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  • Description
  • Claims
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Problems solved by technology

[0007] 3) The second phase particles are easy to agglomerate and form particle clusters
[0009] 5) Material strength and elastic modulus are still low

Method used

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  • A preparation method of in-situ mgo dispersion strengthened ultrafine-grained al-mg alloy
  • A preparation method of in-situ mgo dispersion strengthened ultrafine-grained al-mg alloy

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Embodiment Construction

[0030] A method for preparing an in-situ MgO dispersion-strengthened ultrafine-grained Al-Mg alloy, comprising the steps of:

[0031] a. Weigh Al powder and Mg powder with a precision balance, wherein the atomic proportions of solute Mg atoms in the alloy are 0at.%, 2.5at.%, 5at.%, 7.5at.% respectively; select 1wt.% stearin Acid as a process control agent to prevent and avoid excessive cold welding of powder;

[0032] b. Put the weighed Al powder and Mg powder into the ball mill jar equipped with stainless steel grinding balls respectively, and the stainless steel grinding balls are 5 steel balls with a diameter of 20mm and 10 steel balls with a diameter of 16mm; wherein, the Al powder and the Mg powder The ratio of the total mass of the powder to the total mass of the stainless steel grinding balls is 5:1;

[0033] c. In a glove box full of argon, seal the ball mill tank with stainless steel balls and powder;

[0034] d. First use a planetary ball mill to fully mix the powd...

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Abstract

The invention belongs to the field of powder metallurgy, and specifically relates to a preparation method for in-situ generation of MgO dispersion-strengthened ultra-fine-grained Al-Mg alloy. The technical solution of the present invention is as follows: it includes the following steps: weighing Al powder and Mg powder, wherein the atomic ratio of solute Mg atoms in the alloy is 0-8at.%; ball milling, first using a planetary ball mill to fully mix at low operating speed powder for 6 hours, with a rotation speed of 180-220 rpm; then ball mill the mixed powder for 36 hours at a high operating speed, with a rotation speed of 480-520 rpm, with no interruption during high-energy ball milling; passivation treatment, and pressing into a powder body ; Heating to 500°C, and then holding at 500°C for 2 minutes. After the heat preservation is completed, immediately move the heated powder blank into the preheated extrusion die and hot-extrude the powder blank into a hot extrusion rod with a diameter of 6mm; heat treatment. The alloy prepared by the invention has the advantages of low density, high strength, high elastic modulus, ultra-fine microstructure and clean particle interface.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and in particular relates to a method for preparing an in-situ MgO dispersion-strengthened ultrafine-grained Al-Mg alloy. Background technique [0002] Al-Mg alloys are widely used in aerospace, marine ships and automobile industries because of their low density, excellent corrosion resistance, weldability and good comprehensive mechanical properties. However, since the strength of the alloy mainly comes from the solid solution strengthening of Mg element, the strength of the alloy is closely related to the concentration of solute Mg atoms dissolved in the Al matrix. However, the content of Mg element in the Al-Mg light alloy prepared by traditional ingot metallurgy is about 5-6wt.% (mass percentage), and this solid solution amount can only provide limited strength increase; The modulus of elasticity of Al is reduced. Therefore, in order to expand the application range of Al-Mg light alloys and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C21/06C22F1/047
Inventor 周登山张德良耿宏伟
Owner NORTHEASTERN UNIV LIAONING
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