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

An intermetallic compound and crystal structure technology, applied in the field of Ti-modified NiAl-Cr heterogeneous eutectic new structure intermetallic compound, can solve the problems of low high temperature strength and achieve the effect of good mechanical properties

Inactive Publication Date: 2008-10-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The current research shows that in the state of multi-phase alloy, compared with the NiAl alloy with equiatomic ratio, the Ni-rich NiAl alloy has good room temperature plasticity, such as: foreign Ishida et al. added the third element Co to Ni-rich NiAl , Cu, its composition is Ni-26Al-50Co, Ni-24Al-30Cu, its tensile plasticity at room temperature reaches 10.2%, 2.5% respectively, but the high temperature strength is low

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Preparation of Ni-28Al-30Cr-4Mo-5Ti intermetallic compound

[0028] The ingredients are prepared according to the nominal composition of Ni-28Al-30Cr-4Mo-5Ti (atomic percentage), and the purity of the raw materials is 99.999%.

[0029] Use non-consumable vacuum electric arc furnace to melt Ni-28Al-30Cr-4Mo-5Ti alloy ingot, and the vacuum degree is greater than 5×10 -3 Pa, smelting temperature 3000°C, smelting 4 times, the raw materials are smelted evenly.

[0030] 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.

[0031] A cylindrical sample with a diameter of 6mm and a height of 9mm and a square column with a diameter of 6mm×6mm×30mm were cut from the heat-treated Ni-28Al-30Cr-4Mo-5Ti ingot by wire cutting method for mechanical performance testing.

[0032] Accurate to 10 with Model 1111 -4 The mass M of the sample is measured by ...

Embodiment 2

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

[0035] The ingredients are formulated according to the nominal composition of Ni-16Al-30Cr-4Mo-17Ti (atomic percentage), and the purity of the raw materials is 99.999%.

[0036] Use non-consumable vacuum electric arc furnace to melt Ni-16Al-30Cr-4Mo-17Ti alloy ingot, and the vacuum degree is greater than 5×10 -3 Pa, the melting temperature is 2700°C, smelting 6 times, and the raw materials are smelted evenly.

[0037] 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.

[0038] The mechanical property test condition of Ni-16Al-30Cr-4Mo-17Ti intermetallic compound is identical with embodiment 1, and its density is 6.32g / cm 3 The compression yield strength at room temperature is 2200MPa, and the compression plasticity is greater than 35%; the compression yield strength at 600°...

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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,3-17at% 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 a Ti-modified NiAl-Cr(Mo) multi-phase eutectic novel 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 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 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 ...

Claims

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Application Information

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