Fe-modified NiAl-Cr(Mo) polyphase eutectic intermetallic compound

An intermetallic compound and new crystal technology, which is applied in the field of Fe-modified NiAl-Cr heterogeneous eutectic new structure intermetallic compound to achieve the effect of improving high temperature strength and good mechanical properties

Inactive Publication Date: 2007-05-30
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the room temperature plasticity of these two alloys is almost 0, and the fracture toughness is only 4-5 MPa m 1 / 2

Method used

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  • Fe-modified NiAl-Cr(Mo) polyphase eutectic intermetallic compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Preparation of Ni-25Al-30Cr-4Mo-8Fe intermetallic compound

[0028] According to the nominal composition of Ni-25Al-30Cr-4Mo-8Fe (atomic percentage), the raw materials are all 99.999% pure.

[0029] Use non-consumable vacuum arc furnace to smelt Ni-25Al-30Cr-4Mo-8Fe alloy ingots with a vacuum degree greater than 5×10 -3 Pa, smelting temperature 3000 ℃, refining 4 times, the raw materials can be smelted uniformly.

[0030] The prepared intermetallic compound rods are kept in a high temperature heat treatment furnace at 1200° C. for 12 hours and then cooled to room temperature along with the furnace.

[0031] The wire cutting method was used to cut a cylindrical sample with a diameter of 6mm and a height of 9mm from the heat-treated Ni-25Al-30Cr-4Mo-8Fe ingot and a square cylinder with a size of 6mm×6mm×30mm for mechanical performance testing.

[0032] Using 1111 type accuracy is 10 -4 The g electronic balance measures the mass M of the sample with an accuracy of...

Embodiment 2

[0034] Example 2: Preparation of Ni-16Al-30Cr-4Mo-17Fe intermetallic compound

[0035] According to the nominal composition of Ni-16Al-30Cr-4Mo-17Fe (atomic percentage), the raw materials are all 99.999% pure.

[0036] Use non-consumable vacuum electric arc furnace to smelt Ni-16Al-30Cr-4Mo-17Fe alloy ingots with a vacuum degree greater than 5×10 -3 pa, smelting temperature 2700℃, smelting 6 times, and the raw materials can be smelted uniformly.

[0037] The prepared intermetallic compound rods are kept in a high temperature heat treatment furnace at 1200° C. for 12 hours and then cooled to room temperature along with the furnace.

[0038] The test conditions of the mechanical properties of the Ni-16Al-30Cr-4Mo-17Fe intermetallic compound are the same as those in Example 1, and the density is 6.99g / cm 3 The yield strength at room temperature is 2100MPa, and the compressive plasticity is greater than 32%; the yield strength at 600°C is 900MPa, and the compressive plasticity is gre...

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Abstract

The invention discloses a new-typed structure metal compound of Fe modified NiAl-Cr (Mo) polyphase eutectic crystal, which comprises the following parts: 33at% Ni,30at% Cr,4at% Mo,1-17at% Fe and Al, wherein the NiAl-Cr (Mo) polyphase alloy is modified by Fe, which induces plastic third phase gamma-phase and gamma'-phase to improve high-temperature strength and indoor temperature flexibility and plasticity.

Description

Technical field [0001] The invention relates to an Fe-modified NiAl-Cr(Mo) multiphase eutectic new structure 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 the structural weight, improve efficiency, and reduce energy consumption, it is necessary to develop new low-density, high-strength high-temperature alloys to meet the needs of future development in related industrial fields. What is more urgent is that the current high temperature alloys represented by Ni and Co bases are close to the limit temperature of their use due to the limitation of melting point. Even the third-generation superalloy single crystal with a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00
Inventor 徐惠彬张志刚宫声凯汤林志刘先斌
Owner BEIHANG UNIV
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