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A method for obtaining gradient micro-nano-scale twins on the surface of tc21 titanium alloy

A micro-nano-scale, titanium alloy technology, applied in the field of material surface treatment and modification, can solve the problem of not being widely used, and achieve the effects of inhibiting the generation and proliferation of dislocations, improving mechanical properties, and high deformation storage energy.

Active Publication Date: 2020-09-15
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the successful technology for preparing nano-twins in scientific research is mainly nano-twinned pure copper materials prepared by pulse electrodeposition and magnetron sputtering, which have excellent performance, but nano-twinned pure copper samples prepared by the above methods It is generally thin, and the thickness of the prepared plate-shaped tensile specimen is only 40 μm, which cannot be widely used.
Twins are more common in metal materials, especially in low-fault-energy metals, it is easier to form twins. How to introduce micro-nano-scale twin structures in high-fault energy metals to further improve the mechanical properties of materials will be a major scientific research problem. , there is no literature report on obtaining micro-nano scale twin structure in high-level fault energy TC21 titanium alloy to achieve strengthening and plasticization

Method used

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  • A method for obtaining gradient micro-nano-scale twins on the surface of tc21 titanium alloy
  • A method for obtaining gradient micro-nano-scale twins on the surface of tc21 titanium alloy
  • A method for obtaining gradient micro-nano-scale twins on the surface of tc21 titanium alloy

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Experimental program
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Effect test

Embodiment 1

[0019] The process of preparing the micro-nano-scale twin structure on the surface of the TC21 titanium alloy plate includes the following steps:

[0020] (1) The length of the original plate is 55mm, the width is 40mm, and the thickness is 8mm.

[0021] (2) Heat the plate to the high-temperature β-phase region, the temperature is 1050 ° C, and immediately perform water quenching after holding for 60 minutes to form a supersaturated martensite phase.

[0022] (3) Reheat the plate to 830°C, keep it warm for 30 minutes, and then hot-roll the plate to a thickness of 2 mm by repeated hot rolling. The plate has a high deformation storage energy after undergoing large plastic deformation in the dual-phase region, which is the final dual-phase Zone insulation provides the driving force for recrystallization.

[0023] (4) Finally, the plate is heated to 800°C for 20 minutes, and then air-cooled to form an equiaxed ultrafine grain structure, with an average grain size ranging from 1 μ...

Embodiment 2

[0029] The process of preparing the micro-nano-scale twin structure on the surface of TC21 titanium alloy rod includes the following steps:

[0030] (1) The length of the original plate is 80mm, the height is 60mm, and the thickness is 36mm.

[0031] (2) Heat the plate to the β-phase region of the titanium alloy heat treatment, the temperature is 1100 ° C, and quench after holding for 90 minutes.

[0032] (3) Reheat the plate to 850°C, keep it warm for 60 minutes, and carry out plastic deformation by rolling until the thickness is 12mm.

[0033] (4) Finally, the plate is heated to 830°C for 60 minutes, and then air-cooled to form an equiaxed ultrafine grain structure, with an average grain size ranging from 1 μm to 3 μm.

[0034] (5) The bar is taken from a plate with a thickness of 12 mm and a diameter of 10 mm.

[0035] (6) The surface of the bar is ground and polished with water sandpaper with a particle size of 200#, 500#, 800#, 1000#, 2000#, 3000#, and 5000# to ensure t...

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Abstract

The invention provides a method for obtaining gradient micro-nano scale twin crystals on a surface layer of TC21 titanium alloy. The method includes, firstly, obtaining supersaturated phase after solid solution in a high-temperature beta phase region; secondly, carrying out repeated thermal deformation in a dual-phase region; and thirdly, heating and controlling to form ultra-fine recrystallized crystal grains. On this basis, high pressure water jet peening is adopted to modify the surface of titanium alloy with ultra-fine grains, through surface deformation with high strain rate, plastic deformation is easier to be carried out in twinning mode, therefore, the surface gradient micro-nano twin crystal structure can be formed in the ultra-fine grains after surface modification of the material. The micro-nano twin crystals formed in the ultra-fine crystal grains has great contribution to the improvement of hardness and strength, and the highest hardness of a subsurface layer can reach 412HV. The method belongs to the technical field of material surface treatment and modification.

Description

technical field [0001] The invention relates to a method for obtaining gradient micro-nano-scale twinning on the surface layer of TC21 titanium alloy, which belongs to the technical field of material surface treatment and modification. Background technique [0002] Nano-twinned metal materials have attracted extensive attention due to their excellent properties, such as strength and hardness that cannot be achieved by general materials, and at the same time have high plasticity, fracture toughness, high electrical conductivity, and high strain rate sensitivity. , Anti-fatigue crack initiation performance and so on. Its excellent mechanical properties are attributed to its large number of low-energy coherent twin boundaries. The crystals on both sides of the coherent twin boundaries are in a symmetrical relationship. The coherent twin boundaries are similar to ordinary high-angle grain boundaries and can effectively hinder the movement of dislocations. , so that the material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22F1/002C22F1/183
Inventor 梁益龙孙皓徐玉友
Owner GUIZHOU UNIV