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

An intermetallic compound and eutectic metal technology, which is applied in the field of NiAl-Cr dual-phase eutectic intermetallic compounds, can solve the problems that the gas turbine engine cannot be used, and the high-temperature strength of the dual-phase eutectic intermetallic compound is not improved. , to achieve the effect of improving high temperature strength and good comprehensive performance

Inactive Publication Date: 2009-08-05
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 m...

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 As shown 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...

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 image 3 As shown in the figure, the yield strength at room temperature (25°C) is 1900MPa, and the compression plasticity is greater than 21%; the yield strength a...

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Abstract

The invention discloses a Hf-modified NiAl-Cr(Mo) dual-phase eutectic intermetallic compound, the composition range of which is 33at% Ni, 30at% Cr, 4at% Mo, 0.1-11at% Hf and The balance of Al. The NiAl-Cr(Mo) dual-phase eutectic alloy is modified by reducing the content of Al element and adding Hf element in the composition range near the eutectic point of NiAl-Cr(Mo) dual-phase eutectic alloy. Hf element and NiAl The Heusler (L21-Ni2AlHf) phase is formed, and the Heusler phase is introduced on the basis of the Ni-rich NiAl-Cr (Mo) two-phase structure with good room temperature plasticity and toughness to further improve the high-temperature strength of the eutectic intermetallic compound. The yield strength of the Hf-modified NiAl-Cr(Mo) dual-phase eutectic intermetallic compound at 1150 DEG C is 300-420MPa and the density is 6.02-7.66g / cm3.

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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Patent Type & Authority Patents(China)
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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