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

A technology of intermetallic compounds and eutectic metals, which is applied in the field of NiAl-Cr dual-phase eutectic intermetallic compounds, can solve the problems that the high-temperature strength of dual-phase eutectic intermetallic compounds is not greatly improved, and cannot meet the requirements of gas turbine engines. , to achieve good overall performance and improve the effect of 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 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 in an environment of 1150 °C.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation of 33Ni-28Al-30Cr-4Mo-5Hf intermetallic compound

[0034] The ingredients are 33Ni-28Al-30Cr-4Mo-5Hf (atomic percentage), and the purity of the raw materials is 99.999%.

[0035] Melting 33Ni-28Al-30Cr-4Mo-5Hf alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 3×10 -3 Pa, smelting temperature 3000°C, smelting 4 times, the raw materials are smelted evenly.

[0036] 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.

[0037] 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-28Al-30Cr-4Mo-5Hf ingot by wire cutting method for mechanical performance testing.

[0038] Accurate to 10 with Model 1111 -4 The mass M of the sample is measured by an electronic balance of g with an accuracy of 10 -2 mm...

Embodiment 2

[0040] Example 2: Preparation of 33Ni-30Al-30Cr-4Mo-3Hf intermetallic compound

[0041] The ingredients are formulated according to the composition of 33Ni-30Al-30Cr-4Mo-3Hf (atomic percentage), and the purity of the raw materials is 99.999%.

[0042] Melting 33Ni-30Al-30Cr-4Mo-3Hf alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 5×10 -3 Pa, smelting temperature 2700°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 testing conditions of 33Ni-30Al-30Cr-4Mo-3Hf intermetallic compound are the same as in Example 1, and its density is 6.11g / cm 3 See Figure 2, in the figure, the yield strength at room temperature (25°C) is 2000MPa, and the compressive plasticity is greater than 17%; the yield strength at 800°C is 1300MPa,...

Embodiment 3

[0045] Example 3: Preparation of 33Ni-32Al-30Cr-4Mo-1Hf intermetallic compound

[0046] The ingredients are formulated according to the composition of 33Ni-32Al-30Cr-4Mo-1Hf (atomic percentage), and the purity of the raw materials is 99.999%.

[0047] Melting 33Ni-32Al-30Cr-4Mo-1Hf alloy ingots in a non-consumable vacuum electric arc furnace with a vacuum degree of 5×10 -3 Pa, the melting temperature is 2700°C, smelting 6 times, and the raw materials are smelted evenly.

[0048] 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.

[0049] The mechanical property test condition of 33Ni-32Al-30Cr-4Mo-1Hf intermetallic compound is identical with embodiment 1, and its density is 6.03g / cm 3 ; See shown in Figure 3, in the figure, the room temperature (25 ℃) yield strength is 1900MPa, compression plasticity is greater than 21%; 800 ℃ yield strength is 1150MPa...

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Abstract

The present invention discloses one kind of Hf modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound comprising Ni in 33 at.%, Cr in 30 at.%, Mo in 4 at.%, Hf in 0.1-11 at.% and Al for the rest. By means of lowering Al content in the two-phase eutectic intermetallic NiAl-Cr(Mo) alloy, and adding Hf element to modify and form one Heusler (L21-Ni2AlHf) phase with NiAl, the Hf modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound has high room temperature toughness and plasticity and further raised high temperature strength. The Hf modified two-phase eutectic intermetallic NiAl-Cr(Mo) compound has yield strength at 1150 deg.c of 300-420 MPa and density of 6.02-7.66 g / cu cm.

Description

technical field [0001] The invention relates to a Hf-modified NiAl-Cr(Mo) dual-phase eutectic intermetallic compound. 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 point. Even for the third-generation superalloy single crystal with...

Claims

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Application Information

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