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NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by V

A technology of intermetallic compounds and eutectic metals, which is applied in the field of V-modified NiAl-Cr dual-phase eutectic intermetallic compounds, which can solve the problems of not being able to meet the requirements of use and little improvement in high-temperature strength

Inactive Publication Date: 2008-03-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature strength of the NiAl-Cr(Mo) dual-phase eutectic alloy has not been greatly improved, and it still cannot meet the requirements of the new generation of gas turbine engines in an environment of 1150 ° C. Further composition design and microstructure design are the key to improving the NiAl metal. An Effective Way to Comprehensive Properties of Intercompounds

Method used

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  • NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by V
  • NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by V
  • NiAl-Cr(Mo) biphase eutectic crystal intermetallic compound modified by V

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of 33Ni-22Al-30Cr-4Mo-11V intermetallic compound

[0032] The ingredients are formulated according to the composition of 33Ni-22Al-30Cr-4Mo-11V (atomic percentage), and the purity of the raw materials is 99.999%. Melting 33Ni-22Al-30Cr-4Mo-11V alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 5×10 -3 Pa, smelting temperature 3000°C, smelting 4 times, the raw materials are smelted evenly.

[0033] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.

[0034] A cylinder sample with a diameter of 6mm and a height of 9mm and a square cylinder with a diameter of 6mm×6mm×30mm were cut from the heat-treated 33Ni-22Al-30Cr-4Mo-11V ingot by wire cutting method for mechanical performance testing.

[0035] Accurate to 10 with Model 1111 -4 The mass M of the sample is measured by an electronic balance ...

Embodiment 2

[0037] Example 2: Preparation of 33Ni-30Al-30Cr-4Mo-3V intermetallic compound

[0038] The ingredients are formulated according to the composition of 33Ni-30Al-30Cr-4Mo-3V (atomic percentage), and the purity of the raw materials is 99.999%. Melting 33Ni-30Al-30Cr-4Mo-3V alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 3×10 -3 Pa, the melting temperature is 2700°C, smelting 6 times, and the raw materials are smelted evenly.

[0039] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.

[0040] The mechanical property test conditions of 33Ni-30Al-30Cr-4Mo-3V intermetallic compound are the same as in Example 1, and its density is 6.07g / cm 3 See Figure 2. In the figure, the yield strength at 25°C is 2100MPa, and the compressive plasticity is greater than 23%; the yield strength at 600°C is 1250MPa, and the compressive plas...

Embodiment 3

[0041] Example 3: Preparation of 33Ni-28Al-30Cr-4Mo-5V intermetallic compound

[0042] The ingredients are formulated according to the composition of 33Ni-28Al-30Cr-4Mo-5V (atomic percentage), and the purity of the raw materials is 99.999%. Melting 33Ni-28Al-30Cr-4Mo-5V alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 4×10 -3 Pa, smelting temperature 2800°C, smelting 5 times, the raw materials are smelted evenly.

[0043] The obtained intermetallic compound rod was kept at 1200° C. for 12 hours in a high-temperature heat treatment furnace, and then cooled to room temperature with the furnace.

[0044] The mechanical property test condition of 33Ni-28Al-30Cr-4Mo-5V intermetallic compound is identical with embodiment 1, and its density is 6.15g / cm 3 See Figure 3. In the figure, the yield strength at 25°C is 2150MPa, and the compressive plasticity is greater than 25%; the yield strength at 600°C is 1200MPa, and the compressive plasticity is...

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Abstract

The present invention discloses one kind of V modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound comprising Ni in 33 at.%, Cr in 30 at.%, Mo in 4 at.%, V in 1-16 at.% and Al for the rest. By means of lowering Al content in the two-phase eutectic intermetallic NiAl-Cr(Mo) alloy, and adding V element to modify and form one Heusler phase to reinforce the base and raise the high temperature performance, the V modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound has high room temperature toughness and plasticity and further raised high temperature strength. The V modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound has yield strength at 1150 deg.c of 120-150 MPa and density of 6.0-6.6 g / cu cm.

Description

technical field [0001] The invention relates to a V-modified NiAl-Cr(Mo) dual-phase eutectic intermetallic compound, in which there are NiAl phase, Cr(Mo) phase and Ni 2 AlV phase. Background technique [0002] At present, in the industrial fields of power, petrochemical, transportation, especially aviation and aerospace, the metal structural materials used above 600 °C are usually nickel-based, iron-based and cobalt-based superalloys. These materials have a higher density (generally at 8.0g / cm 3 Above), the components and equipment made are heavy. In order to reduce structural weight, improve efficiency, and reduce energy consumption, it is necessary to develop new high-temperature alloys with low density and high specific strength to meet the needs of future development in related industrial fields. What is more urgent is that currently the superalloys represented by Ni base and Co base are close to the limit temperature of their use due to the limitation of melting poin...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02
Inventor 宫声凯刘先斌张志刚汤林志徐惠彬
Owner BEIHANG UNIV
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