Fine-grain high-strength TiAl alloy including nano Y2O3 and preparation method thereof

A Y2O3 and nanotechnology, applied in the field of alloy material preparation, can solve the problems of large size difference and uneven distribution of Y-rich phase, etc., and achieve the effect of fine grain, good comprehensive mechanical properties and high temperature deformation ability, and reasonable design

Active Publication Date: 2017-03-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the uneven distribution of the Y-rich phase and the large size difference caused by the addition of the existing aluminum-yttrium master alloy, and the anisotropy of the microstructure and mechanical properties caused by the existing mechanical heat treatment technology, and provides a nano Y-containing 2 o 3 Fine-grained high-strength TiAl alloy and preparation method thereof

Method used

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  • Fine-grain high-strength TiAl alloy including nano Y2O3 and preparation method thereof
  • Fine-grain high-strength TiAl alloy including nano Y2O3 and preparation method thereof
  • Fine-grain high-strength TiAl alloy including nano Y2O3 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Ti-45Al-3Mo-2V-0.2Y 2 o 3 The preparation method of fine-grained high-strength alloy is as follows:

[0043] (1) Weighing raw materials: 45% Al, 3% Mo, 2% V, 0.2% Y according to the atomic percentage of each element 2 o 3 , the balance being Ti and unavoidable impurities. Sponge titanium, pure aluminum, aluminum molybdenum alloy (Mo content is 52.21%), aluminum vanadium alloy (V content is 53.25%), nano Y 2 o 3 Powder (purity 99.99, particle size 100nm, such as figure 1 Shown) a total of 10000g as raw material.

[0044] (2) Melting ingots: Sponge titanium, high-purity aluminum, aluminum-molybdenum alloys, aluminum-vanadium alloys and nano-Y 2 o 3 The powder is added to the water-cooled copper crucible induction shell melting furnace for melting, and then poured into the ZrO preheated at 600 °C 2 In the ceramic mold, a rectangular ingot is obtained.

[0045] (3), billet pretreatment:

[0046] a. Remove the riser from the TiAl alloy ingot and perform hot isosta...

Embodiment 2

[0061] Ti-43Al-4Mo-2V-0.3Y 2 o 3 The preparation method of fine-grained high-strength TiAl alloy is as follows:

[0062] (1) Weighing raw materials: 43% Al, 4% Mo, 2% V, 0.3% Y according to the atomic percentage of each element 2 o 3 , the balance being Ti and unavoidable impurities. Sponge titanium, pure aluminum, aluminum molybdenum alloy (Mo content is 52.21%), aluminum vanadium alloy (V content is 53.25%), nano Y 2 o 3 Powder (purity 99.99, particle size 100nm) total 10000g as raw material;

[0063] (2) Melting ingots: Sponge titanium, high-purity aluminum, aluminum-molybdenum alloys, aluminum-vanadium alloys and nano-Y 2 o 3 The powder is added to the water-cooled copper crucible induction shell melting furnace for melting, and then poured into the ZrO preheated at 500 °C 2 In the ceramic mold, a rectangular ingot is obtained.

[0064] (3), billet pretreatment:

[0065] a. Remove the riser from the TiAl alloy ingot and perform hot isostatic pressing treatment. T...

Embodiment 3

[0080] Ti-44Al-1Mo-1V-0.1Y 2 o 3 The preparation method of fine-grained high-strength TiAl alloy is as follows:

[0081] (1) Weighing raw materials: 44% Al, 1% Mo, 1% V, 0.1% Y according to the atomic percentage of each element 2 o 3 , the balance being Ti and unavoidable impurities. Sponge titanium, pure aluminum, aluminum molybdenum alloy (Mo content is 52.21%), aluminum vanadium alloy (V content is 53.25%), nano Y 2 o 3 Powder (purity 99.99, particle size 100nm) total 10000g as raw material;

[0082] (2) Melting ingots: Sponge titanium, high-purity aluminum, aluminum-molybdenum alloys, aluminum-vanadium alloys and nano-Y 2 o 3 The powder is added to the water-cooled copper crucible induction shell melting furnace for melting, and then poured into the preheated Al 2 o 3 In the ceramic mold, a rectangular ingot is obtained.

[0083] (3), billet pretreatment:

[0084] a. Remove the riser from the TiAl alloy ingot and perform hot isostatic pressing treatment. The tre...

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Abstract

The invention discloses fine-grain high-strength TiAl alloy including nano Y2O3 and a preparation method thereof. In order to solve the problems that existing aluminum-yttrium intermediate alloy is added to cause Y-phase-rich uneven distribution, the dimensions differ greatly, and microscopic structure and mechanical property anisotropism is caused by an existing mechanical heat treatment technology, the method includes the specific steps that first, all the raw material components are weighed; second, an ingot casting is prepared by means of water-cooling copper crucible reaction kish smelting and fired mold precision casting; third, a blank is pretreated; and fourth, multi-directional forging is performed, and accordingly the fine-grain high-strength TiAl alloy can be obtained. The forging stock structure obtained through the method is uniform, crystal grains are small, and the excellent mechanical property can be achieved in three directions.

Description

technical field [0001] The invention relates to the field of preparation of alloy materials, in particular to a nano-Y containing 2 o 3 A fine-grained high-strength TiAl alloy and a preparation method thereof. Background technique [0002] TiAl alloy has low density, high specific strength, and excellent high-temperature oxidation resistance. It has become one of the excellent candidate high-temperature structural materials in the fields of contemporary aviation, aerospace, and civil industries, and has broad application prospects. [0003] However, TiAl alloys have coarse microstructure, low room temperature plasticity, low strength-plasticity matching, and poor high-temperature deformation ability, which limit the preparation and engineering application of TiAl alloys. [0004] The existing TiAl alloy strengthening technology mainly includes alloying and thermomechanical treatment processes. It has been proved that the alloying of Nb and Mo elements is beneficial to impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C30/00C22C32/00C22C1/03C22F1/18
CPCC22C1/03C22C14/00C22C30/00C22C32/0031C22F1/183
Inventor 韩建超王文波李林峰刘邱祖蔚晓嘉张长江张树志肖树龙陈玉勇
Owner TAIYUAN UNIV OF TECH
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