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High Nb-TiAl alloy added with nano yttrium oxide and preparation method of high Nb-TiAl alloy

A nano-yttrium oxide and alloy technology, which is applied in the field of intermetallic compounds and their preparation processes, can solve the problems of poor high temperature mechanical properties and weak creep resistance of TiAl alloys, and achieves improved nucleation rate, improved mechanical properties, and refined Effect of grain size

Active Publication Date: 2020-02-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention solves the technical problems of poor high-temperature mechanical properties and weak creep resistance of existing TiAl alloys, and provides a high-Nb-TiAl alloy with nano-yttrium oxide added and a preparation method thereof

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  • High Nb-TiAl alloy added with nano yttrium oxide and preparation method of high Nb-TiAl alloy
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  • High Nb-TiAl alloy added with nano yttrium oxide and preparation method of high Nb-TiAl alloy

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specific Embodiment approach 1

[0028] Specific Embodiment 1: In this embodiment, a high Nb-TiAl alloy added with nanometer yttrium oxide, the molar percentage of the alloy composition is: 45% to 48% for Al, 6% to 10% for Nb, and 2.5% for V %~3.5%, Nano Y 2 o 3 0.05% to 3% and the rest of Ti.

specific Embodiment approach 2

[0029] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the mole percentage of the alloy composition is: 45% for Al, 6% for Nb, 2.5% for V, nanometer Y 2 o 3 Ti is 0.15% and the balance. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Specific embodiment three: a kind of preparation method of adding the high Nb-TiAl alloy of nanometer yttrium oxide described in specific embodiment one, specifically carry out according to the following steps:

[0031] 1. Cleaning: remove the scale of titanium rod, titanium sponge, high-purity aluminum, aluminum-niobium master alloy and aluminum-vanadium master alloy, perform ultrasonic cleaning in alcohol, and blow dry;

[0032] 2. Weighing: Weighing nanometer Y 2 o 3 Powder, titanium rod after step 1 treatment, titanium sponge, high-purity aluminum, aluminum-niobium master alloy and aluminum-vanadium master alloy, nano Y 2 o 3 The powder is pressed into multiple yttrium oxide prefabricated blocks;

[0033] Or weigh nano Y 2 o 3 Powder, dispersed metal powder, titanium rod after step 1 treatment, titanium sponge, high-purity aluminum, aluminum-niobium master alloy and aluminum-vanadium master alloy, nanometer Y 2 o 3 The powder and dispersed metal powder are unif...

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Abstract

The invention discloses a high Nb-TiAl alloy added with nano yttrium oxide and a preparation method of the high Nb-TiAl alloy, relates to the field of intermetallic compounds and preparation processesthereof, and aims to solve the technical problems of poor high-temperature mechanical property and weak creep resistance of an existing TiAl alloy. The alloy comprises, by mole: Al: 45-48%, Nb: 6-10%, V: 2.5-3.5%, nano yttrium oxide: 0.05-3%, and the balance Ti. The preparation method comprises the steps of briquetting and shaping raw materials; melting alloy block materials, and adding an yttrium oxide prefabricated block for smelting to obtain an alloy ingot; and then carrying out homogenization annealing treatment to finish the preparation. According to the high Nb-TiAl alloy added with the nano yttrium oxide and the preparation method of the high Nb-TiAl alloy, the high-temperature mechanical property and high-temperature creep resistance of the high Nb-TiAl alloy are improved; and the high Nb-TiAl alloy added with the nano yttrium oxide is applied to the field of high-temperature structural materials.

Description

technical field [0001] The invention relates to the field of intermetallic compounds and their preparation technology. Background technique [0002] Studies have shown that TiAl alloy, as an intermetallic compound, has a lower density (3.85-4.2g / cm 3 ), which is lower than the density of titanium alloys, and less than 50% of the density of nickel-based superalloys. At the same time, TiAl alloys are corrosion-resistant, wear-resistant, and have high specific strength and specific stiffness. At the same time, they have good oxidation resistance and excellent fatigue resistance. Performance, the use temperature can reach 700-1000 ℃. Therefore, TiAl alloy is an important material to replace nickel-based superalloys and become the next generation of high-temperature structural materials. [0003] In recent years, research on TiAl alloys at home and abroad has mainly focused on the development of alloys used at higher temperatures. Since Nb can hinder the movement of atoms at hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/03C22C14/00C22C21/00C22F1/04C22F1/18
CPCC22C1/026C22C1/03C22C14/00C22C21/003C22C30/00C22F1/04C22F1/183
Inventor 肖树龙徐丽娟王鑫邵意田竟陈玉勇
Owner HARBIN INST OF TECH
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