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Method for fabricating gradient ultra-fine metal grains

A production method and ultra-fine grain technology, which are applied in the field of material processing, can solve the problems of ultra-fine grain materials such as elasticity, low toughness, no work hardening performance, and low shear band height.

Inactive Publication Date: 2014-07-09
SUZHOU VOCATIONAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the elasticity and toughness of ultra-fine-grained materials are too low, and most ultra-fine-grained materials do not have work hardening properties, thus limiting the large-scale application of such materials in industry
The reason for the low toughness of ultrafine-grained materials is that such materials are highly sensitive to shear bands during deformation, making the elastic properties of the material unstable during deformation

Method used

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  • Method for fabricating gradient ultra-fine metal grains
  • Method for fabricating gradient ultra-fine metal grains
  • Method for fabricating gradient ultra-fine metal grains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for producing graded ultra-fine grained titanium metal is disclosed, including the following steps:

[0038] A. Immerse a 36mm secondary commercial pure Ti plate in liquid nitrogen and cool it to -170°C~-90°C. The purpose of cooling the metal plate to this temperature is to reduce the increase in material temperature during the subsequent rolling process. Prevent heat from recrystallizing and growing the refined grains;

[0039] B. Roll the Ti plate with a compression amount of 2mm each time, and cool the rolled Ti plate to -170°C~-90°C. Gradually rolling can make the stress distributed along the material surface to the internal gradient. Continuing to cool afterwards can keep the surface metal crystal grains in a nano-sized state;

[0040] C. Repeat step B until the thickness of the Ti plate is 5mm, and the weak gradient ultra-fine processing stage is completed. At this time, the grain size of the Ti plate decreases gradually from the surface to the inside, and the ...

Embodiment 2

[0045] A. Immerse a 30mm secondary commercial pure Mg plate in liquid nitrogen and cool it to -170°C~-90°C. The purpose of cooling the metal plate to this temperature is to reduce the increase in material temperature during the subsequent rolling process. Prevent heat from recrystallizing and growing the refined grains;

[0046] B. Roll the Mg plate with a compression of 2mm each time, and cool the rolled Mg plate to -170°C~-90°C. Gradually rolling can make the stress distributed along the material surface to the internal gradient. Continuing to cool afterwards can keep the surface metal crystal grains in a nano-sized state;

[0047] C. Repeat step B until the thickness of the Mg board is 4mm, and the weak gradient ultra-fine processing stage is completed. At this time, the grain size of the Mg board decreases gradually from the surface to the inside, ranging from 50 to 250 nm;

[0048] D. After the completion of step C, proceed to the strong gradient ultra-fine processing stage, cu...

Embodiment 3

[0052] A. Immerse a 40mm secondary commercial pure Al plate in liquid nitrogen and cool it to -170°C~-90°C. The purpose of cooling the metal plate to this temperature is to reduce the increase in material temperature during the subsequent rolling process. Prevent heat from recrystallizing and growing the refined grains;

[0053] B. Roll the Al plate with a compression of 2mm each time, and cool the rolled Al plate to -170°C~-90°C. Gradually rolling can make the stress distribution along the material surface to the internal gradient. Continuing to cool afterwards can keep the surface metal crystal grains in a nano-sized state;

[0054] C. Repeat step B until the thickness of the Al plate is 6mm, and the weak gradient ultra-fine processing stage is completed. At this time, the grain size of the Al plate decreases gradually from the surface to the inside, and the range is 50~250nm;

[0055] D. After the completion of step C, perform a strong gradient ultra-fine processing stage, cut th...

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Abstract

The invention discloses a method for fabricating gradient ultra-fine metal grains. The ultra-fine metal grains in weak gradient distribution from the surface to the heart part are obtained in manners of liquid nitrogen cooling and gradually rolling, and then surface mechanical attrition treatment is carried out; the grains are further increased from the metal surface to the internal part in a gradient manner; and the ultra-fine metal grains in strong gradient distribution are finally obtained, so that the metal has high strength, high toughness and corrosion resistance, and excellent work hardening properties. The grains fabricated by the fabrication method are stable in quality, and simultaneously low in cost.

Description

Technical field [0001] The invention relates to a material processing method, in particular to a production method of graded ultrafine grained metal. Background technique [0002] High-strength, high-toughness lightweight structural materials have a wide range of uses and huge needs in the fields of aerospace, construction, transportation, and weaponry. Ultra-fine grain materials (grain size less than 300 nanometers) have many excellent properties, such as high strength, high hardness, and high corrosion resistance due to their unique microstructure, and are one of the hot materials recently studied at home and abroad. However, the elasticity and toughness of ultra-fine-grained materials are too low, and most ultra-fine-grained materials do not have work hardening properties, thus limiting the large-scale application of such materials in industry. The reason for the low toughness of ultra-fine-grained materials is that such materials are highly sensitive to shear bands during th...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D6/04C22F1/18
Inventor 周正存杨登科杜洁严勇健杨洪顾苏怡
Owner SUZHOU VOCATIONAL UNIV
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