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

A technology of intermetallic compounds and eutectic metals, which is applied in the field of Ta-modified NiAl-Cr(Mo) double-phase eutectic intermetallic compounds, which can solve the problems of little improvement in high temperature strength and failure to meet the use requirements.

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 NiAl-Cr(Mo) dual-phase eutectic intermetallic compounds has not been greatly improved, and it still cannot meet the requirements of the new generation of gas turbine engines at 1150 °C. An effective approach to the comprehensive properties of NiAl intermetallic compounds

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Preparation of 33Ni-28Al-30Cr-4Mo-5Ta intermetallic compound

[0031] The ingredients are formulated according to the composition of 33Ni-28Al-30Cr-4Mo-5Ta (atomic percentage), and the purity of the raw materials is 99.999%.

[0032] Melting 33Ni-28Al-30Cr-4Mo-5Ta 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 cylindrical 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-28Al-30Cr-4Mo-5Ta ingot by the 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 ele...

Embodiment 2

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

[0038] The ingredients are 33Ni-30Al-30Cr-4Mo-3Ta (atomic percentage), and the purity of the raw materials is 99.999%.

[0039] Melting 33Ni-30Al-30Cr-4Mo-3Ta 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.

[0040] 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.

[0041] The mechanical property test condition of 33Ni-30Al-30Cr-4Mo-3Ta intermetallic compound is identical with embodiment 1, and its density is 6.28g / cm 3 See Figure 2. In the figure, the yield strength at 25°C is 1380MPa, and the compression plasticity is greater than 20%; the yield strength at 800°C is 450MPa, and the compression plasticity is greater than 35%; th...

Embodiment 3

[0042] Example 3: Preparation of 33Ni-25Al-30Cr-4Mo-8Ta intermetallic compound

[0043] The ingredients are formulated according to the composition of 33Ni-25Al-30Cr-4Mo-8Ta (atomic percentage), and the purity of the raw materials is 99.999%.

[0044] Melting 33Ni-25Al-30Cr-4Mo-8Ta alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 4×10 -3 Pa, smelting temperature 3000°C, smelting 4 times, the raw materials are smelted evenly.

[0045] 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.

[0046] The mechanical property test condition of 33Ni-25Al-30Cr-4Mo-8Ta intermetallic compound is identical with embodiment 1, and its density is 6.51g / cm 3 See Figure 3. In the figure, the yield strength at 25°C is 1880MPa, and the compression plasticity is greater than 15%; the yield strength at 800°C is 720MPa, and the compression p...

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Abstract

The present invention discloses one kind of Ta modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound comprising Ni in 33 at.%, Cr in 30 at.%, Mo in 4 at.%, Ta in 1-13 at.% and Al for the rest. By means of lowering Al content in the two-phase eutectic intermetallic NiAl-Cr(Mo) alloy, and adding Ta element to modify and form one Laves(Cr2Ta) phase with Cr, the Ta modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound has high room temperature toughness and plasticity and further raised high temperature strength. The Ta modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound has yield strength at 1150 deg.c of 120-400 MPa and density of 6.1-6.9 g / cu cm.

Description

technical field [0001] The invention relates to a Ta-modified NiAl-Cr(Mo) dual-phase eutectic novel structure intermetallic compound, wherein NiAl phase, Cr(Mo) phase and Cr phase exist in the intermetallic compound 2 Ta 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 ...

Claims

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Application Information

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