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Preparation method for in-situ generation of MgO dispersion strengthened ultra-fine grain Al-Mg alloy

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

Active Publication Date: 2018-08-03
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method for in-situ generation of MgO dispersion strengthened ultra-fine grain Al-Mg alloy
  • Preparation method for in-situ generation of MgO dispersion strengthened ultra-fine grain 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 particularly relates to a preparation method for in-situ generation of an MgO dispersion strengthened ultra-fine grain Al-Mg alloy. According to the technical scheme of the preparation method, the preparation method includes the following steps that Al powder and Mg powder are weighed, wherein solute Mg atoms account for 0-8 at.% of atoms of the alloy; ball-milling is performed, wherein firstly the powder is sufficiently mixed for 6 h through a planetary ball mill at a low running speed, and the rotating speed is 180-220 r / min; thenthe mixed powder is subjected to ball milling for 36 h at a high running speed, the rotating speed is 480-520 r / min, and no intermittence exists in the high-energy ball milling period; passivation treatment is performed, wherein pressing into powder blank is performed; heating to 500 DEG C is performed, then heat preserving under 500 DEG C is performed for 2 min, after heat preserving ends, the heated powder blank is immediately transferred into a preheated extruding die, and the powder blank is subjected to hot extruding to form a hot extruded rod with the diameter being 6 mm; and heat treatment is performed. The alloy prepared through the preparation method has the beneficial effects of being low in density, high in strength, high in elastic modulus, superfine in microscopic structure and clean in 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...

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Application Information

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