A method for obtaining ultra-fine grains and surface micro-nano-scale twinning in tc4 titanium alloy
An ultra-fine-grain, micro-nano-scale technology, applied in the field of material surface treatment and modification, can solve problems such as not being widely used, and achieve suppression of dislocation generation and proliferation, improvement of mechanical properties, and high deformation storage energy Effect
Active Publication Date: 2020-09-15
GUIZHOU UNIV
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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 metal materials, it is easier to form twins. How to introduce micro-nano scale twin structure in high fault energy metals to further improve the mechanical properties of materials will be a major technical problem , there is no literature report on obtaining micro-nano scale twin structure in high-level fault energy TC4 titanium alloy to achieve strengthening and plasticization
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Embodiment 1
[0023] The process of preparing the micro-nano-scale twin structure on the surface of the TC4 titanium alloy plate includes the following steps:
[0024] (1) The diameter of the original hot-rolled bar is 54mm and the height is 40mm.
[0025] (2) Heat the original hot-rolled bar to the heat-treated dual-phase (α+β) zone of the titanium alloy at a temperature of 920°C, keep it warm for 60 minutes, and perform rapid plastic deformation by pier pulling until the thickness is 30mm, and then water quench immediately Maintain the formed tissue at high temperature while preserving the driving force for recrystallization.
[0026] (3) Heat the water-quenched plate to 800°C for 20 minutes, and then air-cool to form an equiaxed ultrafine grain structure, with an average grain size ranging from 1 μm to 2 μm.
[0027] (4) The plate is ground and polished with water sandpaper with a particle size of 200#, 500#, 800#, 1000#, 2000#, 3000#, and 5000# to ensure that the sample roughness is wi...
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Abstract
The invention provides a method for obtaining ultra-fine grains and surface micro-nano-scale twin crystals from a TC4 titanium alloy and belongs to the technical field of material surface treatment and modification. The method comprises the steps of conducting large deformation and rapid cooling treatment through a two-phase region and then conducting reheating control to form ultra-fine recrystallized grains; conducing modified treatment on the titanium alloy surfaces of the ultra-fine grains through a high-pressure water jet shot blasting method on this basis. Through surface deformation atthe high-strain rate, plastic deformation is conducted more easily in a twinned mode. Thus, after the material is subjected to surface layer modification, a surface layer gradient micro-nano-scale twin crystal structure is formed in the ultra-fine grains. The method makes great contribution to hardness and strength improvement on the micro-nano-scale twin crystals formed in the ultra-fine grains,and the maximum hardness of sub-surfaces can reach up to 396 HV.
Description
technical field [0001] The invention relates to a method for obtaining ultrafine grains and surface micro-nano scale twins in TC4 titanium alloy, and 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 is str...
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IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 梁益龙孙皓曹洪川
Owner GUIZHOU UNIV