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Ultra-high-density twinned titanium and its preparation method

An ultra-high density, twinning technology, applied in the preparation of ultra-high-density twinned titanium, can solve problems such as the lack of nano-twinned strengthening and toughening effect, the unsatisfactory limit density, and the difficulty in obtaining high-density twinning.

Active Publication Date: 2021-07-06
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, only by reducing the deformation temperature, although the twin density of titanium has been greatly improved compared with room temperature deformation, its limit density is still not ideal, and it is difficult to obtain high-density twins uniformly distributed in the entire grain.
Moreover, the degree of improvement in mechanical properties does not reflect the strengthening and toughening effect that nano-twins should have.

Method used

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  • Ultra-high-density twinned titanium and its preparation method
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  • Ultra-high-density twinned titanium and its preparation method

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Embodiment Construction

[0021] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0022] like figure 1 As shown, the following examples involve a two-step process including: rotary rolling and annealing treatment to control the texture, and deep low temperature rolling to prepare ultra-high-density twinned titanium, wherein:

[0023] A sample of 15 mm x 60 mm x 100 mm was cut from the obtained plate, and the surface and corners were polished for treatment. like figure 1 Shown is the process flow chart for preparing ultra-high-density twinned titanium. The specific implementation steps are as follows: 1) along the plate RD 1 2) Rotate the plate 135° counterclockwise after rolling, at this tim...

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Abstract

The invention discloses an ultra-high-density twinned titanium and a preparation method thereof, comprising three steps of rotary rolling, annealing treatment, and cryogenic low-temperature cold rolling. The texture of the basal surface is controlled by rotary rolling to obtain a texture strength of 21.73 Ultra-high-strength textured titanium material; annealing treatment restores and eliminates microscopic defects and substructures, but retains a high-strength texture with a texture strength of 14.33 on the base surface; cryogenic and low-temperature cold-rolled deformation is based on the first two steps of the process, Introduce an ultra-high-density twin structure with a twin area fraction as high as 67.3%. The yield strength of the ultra-high-density twinned titanium prepared by the invention is above 850MPa, and the tensile strength is close to 1GP.

Description

technical field [0001] The invention relates to a method for preparing ultra-high-density twinned titanium, in particular to a material preparation method for controlling texture through rotary rolling and introducing ultra-high-density twins in combination with cryogenic rolling, and belongs to the field of material preparation. Background technique [0002] Due to its light weight, high specific strength, good corrosion resistance and excellent biocompatibility, titanium is being increasingly widely used in the fields of aerospace, automobiles and ships, and biomedicine. However, compared with general structural engineering materials, such as stainless steel and die steel, titanium has lower strength, which limits its further application in the industrial field. In order to improve the strength of titanium, it is an effective means to refine titanium grains by plastic deformation. The large plastic deformation technology has a remarkable ability to refine the grain, and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 曹阳黄照文李玉胜雍鹏凌聂金凤周浩
Owner NANJING UNIV OF SCI & TECH
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