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Deformation-induced laves phase dispersion toughening titanium alloy and preparation method thereof

A titanium alloy, strengthening and toughening technology is applied in the field of deformation-induced laves phase dispersion strengthening and toughening titanium alloy and its preparation, which can solve the problems of large pollution, high cost, complicated production and preparation process, etc., and achieves excellent alloy performance and convenient operation. Effect

Active Publication Date: 2018-01-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, common high-strength and tough titanium alloys are mainly produced by casting and subsequent heat treatment. The production and preparation process is not only complicated and costly, but also high energy consumption and pollution.
At the same time, since most of the microstructures of these titanium alloys are mechanically combined by a variety of complex phases, it is difficult to precisely control their microstructures by multi-component alloying and post-heat treatment alone, resulting in the improvement of their mechanical properties. appear blind

Method used

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  • Deformation-induced laves phase dispersion toughening titanium alloy and preparation method thereof
  • Deformation-induced laves phase dispersion toughening titanium alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Powder mixing: According to the material design principle that the ternary alloy system has multiple crystalline phases, and two phases can preferentially undergo eutectic transformation, the designed alloy system is Ti 62.5 Fe 25.5 co 12 (atomic percent), which includes bccβ-Ti, bccTiFe, and fcc CoTi 2 and other three crystalline phases, among which bccβ-Ti and bcc TiFe can preferentially undergo eutectic transformation to form a liquid phase. The elemental powders of Ti, Fe, and Co elements with a particle size of 75 μm prepared by the atomization method are dosed according to atomic percentages. Mix the elemental powders evenly in a powder mixer.

[0035](2) Preparation of alloy powder by high-energy ball milling: Place the uniformly mixed alloy powder in a planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling medium such as the tank body and ball material of the ball mill are all stainless steel, and the diameters of the balls are respe...

Embodiment 2

[0042] (1) Powder mixing: According to the material design principle that the ternary alloy system has multiple crystalline phases, and two phases can preferentially undergo eutectic transformation, the designed alloy system is Ti 65 Fe 27.5 co 7.5 (atomic percent), which includes bccβ-Ti, bccTiFe, and fcc CoTi 2 and other three crystalline phases, among which bccβ-Ti and bcc TiFe can preferentially undergo eutectic transformation to form a liquid phase. The elemental powders of Ti, Fe, and Co elements with a particle size of 75 μm prepared by the atomization method are dosed according to atomic percentages. Mix the elemental powders evenly in a powder mixer.

[0043] (2) Preparation of alloy powder by high-energy ball milling: Place the uniformly mixed alloy powder in a planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling medium such as the tank body and ball material of the ball mill are all stainless steel, and the diameters of the balls are respe...

Embodiment 3

[0050] (1) Powder mixing: According to the material design principle that the ternary alloy system has multiple crystalline phases, and two phases can preferentially undergo eutectic transformation, the designed alloy system is Ti 62.5 Fe 25.5 co 12 (atomic percent), which includes bccβ-Ti, bccTiFe, and fcc CoTi 2 and other three crystalline phases, among which bccβ-Ti and bcc TiFe can preferentially undergo eutectic transformation to form a liquid phase. The elemental powders of Ti, Fe, and Co elements with a particle size of 75 μm prepared by the atomization method are dosed according to atomic percentages. Mix the elemental powders evenly in a powder mixer.

[0051] (2) Preparation of alloy powder by high-energy ball milling: Place the uniformly mixed alloy powder in a planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling medium such as the tank body and ball material of the ball mill are all stainless steel, and the diameters of the balls are resp...

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Abstract

The invention belongs to the technical field of alloy processing and discloses a deformation-induced laves phase dispersion toughening titanium alloy and a preparation method thereof. Materials comprising, by atom, 62.5-65% of Ti, 25.5-27.5% of Fe and 7.5-12% of Co are mixed evenly and then sequentially subjected to high energy ball milling and semi-solid sintering, and thus a sintered titanium alloy is obtained; the yield strain capacity of the sintered titanium alloy is tested; and then the obtained sintered titanium alloy is highly deformed by 3.5%-5.5% at a certain strain speed rate, it isguaranteed that the deformation quantity is larger than or equal to the yield strain capacity, and the deformation-induced laves phase dispersion toughening titanium alloy is obtained. By controllingthe strain speed rate and the total strain capacity of alloy loading, precise adjustment and control of the precipitation quantity and the grain size of Laves are achieved, so that the alloy has thenanometer and ultrafine-scale strip-shaped and isometric crystal coexisting multi-scale dual-state structure, and the alloy performance is better.

Description

technical field [0001] The invention belongs to the technical field of alloy processing, and in particular relates to a deformation-induced laves phase dispersion strengthening and toughening titanium alloy and a preparation method thereof. Background technique [0002] As a new type of advanced lightweight metal structure material, titanium alloy has excellent properties such as low density, high strength, high plasticity and high fracture toughness, good corrosion resistance and biocompatibility, and is widely used in aviation, aerospace, Machinery, national defense equipment, chemical industry, shipbuilding, medical treatment, energy and other fields. With the rapid development of modern industry, the use conditions and strength requirements of titanium alloy materials continue to increase. It is possible to design and prepare high-performance titanium alloys with higher strength, toughness, simple process, and lower production costs to meet applications under harsher con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/04C22F1/18
Inventor 杨超康利梅李鑫鑫屈盛官李小强张卫文
Owner SOUTH CHINA UNIV OF TECH
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