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Preparation method of ultrahigh-strength pure aluminum

An ultra-high-strength, pure aluminum technology, applied in the direction of metal extrusion control equipment, metal rolling, manufacturing tools, etc., can solve the problem of sacrificing the plasticity of aluminum alloys, so as to improve the strength, the plasticity will not be significantly weakened, and the strength will be improved. Effect

Inactive Publication Date: 2020-08-18
南通南京大学材料工程技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method often significantly sacrifices the plasticity of aluminum alloy while improving the strength.

Method used

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  • Preparation method of ultrahigh-strength pure aluminum
  • Preparation method of ultrahigh-strength pure aluminum
  • Preparation method of ultrahigh-strength pure aluminum

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preparation example Construction

[0022] The invention provides a method for preparing ultra-high-strength pure aluminum, comprising the following steps:

[0023] placing as-cast pure aluminum in an equal-channel corner mold for equal-channel corner extrusion deformation to obtain an extruded billet; the corner angle of the equal-channel corner mold is 90°;

[0024] immersing the extruded billet in liquid nitrogen for cooling, and rolling the cooled billet to obtain a rolled billet;

[0025] The process of cooling and rolling is repeated until the billet is thinned to the target thickness after the last rolling pass to obtain ultra-high-strength pure aluminum.

[0026] In the invention, cast pure aluminum is placed in an equal-channel corner mold for equal-channel corner extrusion deformation to obtain an extruded billet.

[0027] The present invention has no special requirements on the source of the as-cast pure aluminum, which can be cast by casting methods known in the art or commercially available product...

Embodiment 1

[0040] The cast industrial pure aluminum (purity is 99.97%) is processed into a columnar specimen of 19.5×19.5×40mm by wire cutting, and the cut specimen is subjected to surface pretreatment to obtain a clean surface. The clean surface of the specimen and etc. The inner surface of the channel corner mold is coated with lubricant, and then the cut specimen is placed in the equal channel corner mold, and pressure is applied at room temperature for 16 consecutive passes of ECAP extrusion, and the sample is rotated between adjacent extrusion passes 90°.

[0041] Cut the test piece after ECAP into a 40×19.5×4mm plate by wire, soak the plate in liquid nitrogen for 5 minutes to ensure that the sample reaches -160°C, and then pass it through a roll (diameter 150mm) at room temperature at 10r min -1 The speed of rolling is fast, and the thickness of the plate is reduced by about 5% after each pass of rolling. Immediately after rolling, the sample is cooled again in liquid nitrogen. Af...

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Abstract

The invention relates to the technical field of alloy machining, in particular to a preparation method of ultrahigh-strength pure aluminum. The preparation method includes the following steps of putting as-cast pure aluminum into an equal-channel-angle die for equal-channel-angle extrusion deformation to obtain an extrusion-state billet, wherein the angle of the equal-channel-angle die is 90 degrees; and soaking the extrusion-state billet in liquid nitrogen for cooling, rolling the cooled billet to obtain a rolled billet, and repeatedly executing the cooling and rolling process until the billet subjected to the last time of rolling is thinned to reach a target thickness to obtain the ultrahigh-strength pure aluminum. By means of the preparation method, the strength of the pure aluminum isgreatly improved, and plasticity cannot be obviously weakened.

Description

technical field [0001] The invention relates to the technical field of alloy processing, in particular to a method for preparing ultrahigh-strength pure aluminum. Background technique [0002] Industrial pure aluminum is a silver-white light metal. Because of its low density and good plasticity, it can be processed into various daily necessities; aluminum has good electrical and thermal conductivity, and can replace copper to make wires in industry, and aluminum can also be used Do heat dissipation materials, etc. However, the absolute strength of industrial pure aluminum is low, which limits its wide application as a structural material. Alloying methods are used to add different elements to pure aluminum, such as adding silicon to form an aluminum-silicon alloy; adding copper to form an aluminum-copper alloy; adding manganese to form an aluminum-manganese alloy, etc., which can significantly improve the pure aluminum. strength. However, this method often significantly s...

Claims

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Application Information

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IPC IPC(8): B21C23/00B21C31/00B21C25/02B21C29/00B21B3/00B21B37/74B21B37/46B21B37/00
CPCB21C23/00B21C31/00B21C25/02B21C29/003B21B3/00B21B37/74B21B37/46B21B37/00B21B2003/001
Inventor 宋丹周芝凯王国威禚孝儒邱超李玉华
Owner 南通南京大学材料工程技术研究院
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