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A powder metallurgy method for preparing ultrafine-grained alloys from micro-nano laminations

A powder metallurgy, micro-nano technology, applied in the field of powder metallurgy preparation, can solve the problems of restricting grain dislocation movement, sacrificial material plasticity, large particle size, etc., to achieve high plastic deformation ability, uniform and fine alloy strengthening phase, and diffusion The effect of shortening the distance

Active Publication Date: 2015-10-14
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method achieves the preparation of ultra-fine-grained nickel-aluminum alloys, it has the following disadvantages: (1) The element powder is usually spherical, and the initial particle size is relatively large. It must undergo repeated cold welding and crushing to be fully refined and uniform. Mix and achieve alloying, so long-term high-energy ball milling process is required, which is time-consuming and laborious; (2) The final alloy structure is close to equiaxed ultra-fine grains, which limits the dislocation movement inside the grains and sacrifices to a large extent plasticity of material

Method used

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  • A powder metallurgy method for preparing ultrafine-grained alloys from micro-nano laminations
  • A powder metallurgy method for preparing ultrafine-grained alloys from micro-nano laminations
  • A powder metallurgy method for preparing ultrafine-grained alloys from micro-nano laminations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take 100g of 10μm pure aluminum powder in a stirring ball mill, use absolute ethanol as a solvent, add 4g of titanate as a ball milling control agent, the ratio of ball to material is 20:1, and ball mill for 4 hours at a speed of 352 rpm to obtain flakes Aluminum powder, the sheet diameter is about 25μm, the sheet thickness is about 500nm, and the diameter-to-thickness ratio is about 50; take 50g of 40μm pure copper powder and place it in a planetary ball mill, use water as a solvent, add 4g of imidazoline as a ball mill control agent, ball The material ratio is 20:1, ball milled at 426 rpm for 10 hours to obtain flake copper powder with a diameter of about 5 μm, a thickness of about 500 nm, and an aspect ratio of about 10.

[0044] Put 96g of the above-mentioned flaky aluminum powder and 4g of flaky copper powder in absolute ethanol, stir and mix for 1h, filter and vacuum-dry to obtain mixed element powder, and finally press the mixed element powder under a pressure of ...

Embodiment 2

[0052] Take 100g of 10μm pure aluminum powder and place it in a stirring ball mill, use argon as a protective atmosphere, add 3g of stearic acid as a ball milling control agent, the ball-to-material ratio is 20:1, and ball mill for 6 hours at a speed of 423 rpm to obtain flakes The aluminum powder has a flake diameter of about 50 μm, a flake thickness of about 150 nm, and an aspect ratio greater than 300; the flake copper powder is prepared according to the method in Example 1.

[0053] Put 96g of the above-mentioned flake aluminum powder and 4g of copper powder flakes into a drum mixer and mix for 4 hours to obtain mixed element powder, and finally press the mixed element powder into a green body with a diameter of 40mm under a pressure of 100MPa. Next, the green body was sintered in an argon atmosphere at 580°C for 3h, and then kept in a vacuum extrusion furnace at 460°C for 1h, and then extruded into a 10mm-diameter tube with an extrusion ratio of 16:1 and an extrusion rate ...

Embodiment 3

[0058] Prepare flake aluminum powder according to the method for embodiment 1; Get 50g50 μm titanium powder and add 1g stearic acid and place in planetary ball mill as ball mill control agent, under the protection of argon, take stainless steel ball as ball mill medium, ball-to-material ratio is 20: 1. Ball mill at a speed of 426 rpm for 12 hours to obtain flake titanium powder with a diameter of about 10 μm, a thickness of about 300 nm, and an aspect ratio greater than 30.

[0059] Take 90g of the above-mentioned flake aluminum powder and 10g of flake titanium powder, mix them according to Example 2, then sinter the powder under vacuum hot pressing at 600°C and 100MPa for 5h to make a green body with a diameter of 40mm, and then put the sintered green body in the Hot forged at 400°C to about 10mm round cake, hot rolled at 350°C into a 3mm thick plate to obtain the final bulk Al-10Ti ultrafine grain alloy material. The mechanical properties of the material at room temperature ...

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Abstract

The invention provides a powder metallurgy method for preparing superfine crystalline alloy by use of a micro-nano laminated sheet. The method comprises the steps of pre-preparing a micro-nano laminated matrix with preferred orientation and alloying element powder, mixing, and carrying out densification and sintering to form an ingot blank with a laminated structure, wherein the thickness of the alloying element powder is hundreds of nanometers, interlaminated interdiffusion is facilitated, alloying uniformity is realized, a texture formed by laminated superfine crystalline grains is obtained through further deformation processing, dislocation movement inside the crystalline grains is facilitated, and good plasticity is kept under a condition that the superfine crystalline strengthening and alloying strengthening mechanisms are brought into full play. The method saves time and energy, has low cost and wide application range, can be used for preparing bulked alloy material and has large-scale application potential, and the performances of the prepared alloy material are remarkably improved compared with the alloy material prepared by the conventional mechanical alloying method.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy preparation, in particular to a powder metallurgy method for preparing ultrafine-grained alloys by micro-nano laminations. Background technique [0002] The development of human civilization and the progress of society are closely related to metal materials. The Bronze Age and Iron Age, which appeared after the Stone Age, were marked by the application of metal materials. In modern times, a wide variety of metal materials have become an important material basis for the development of human society. Alloy materials usually have better mechanical properties than pure metals. In pursuit of alloy materials with higher strength, material scientists have proposed the concept of ultrafine grain or nanocrystalline strengthening. [0003] At present, the main technical means that can realize ultrafine crystals or nanocrystals can be divided into two categories. The first type is to apply larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04
Inventor 李志强秦臻范根莲谭占秋张荻
Owner SHANGHAI JIAOTONG UNIV
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