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Method for raising the strength and toughness of nickel-aluminium alloys by strong magnetic field

A strong magnetic field and alloy technology, which is applied in the field of material modification by strong magnetic field, can solve problems such as poor toughness, low strength and toughness, and alloys that do not meet the requirements for use.

Inactive Publication Date: 2007-01-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most NiAl series have poor toughness, especially at room temperature, with low strength and toughness.
Therefore, material scientists have adopted a variety of means to solve this problem, such as alloying, hot isostatic pressing, directional solidification, etc. to improve the strength and toughness of the alloy. However, the current improvement methods are limited, and the alloy has not yet reached Requirements

Method used

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  • Method for raising the strength and toughness of nickel-aluminium alloys by strong magnetic field
  • Method for raising the strength and toughness of nickel-aluminium alloys by strong magnetic field
  • Method for raising the strength and toughness of nickel-aluminium alloys by strong magnetic field

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Experimental program
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Effect test

Embodiment 1

[0025] The nominal composition of the alloy is (atomic percentage): Ni-33%Al-28%Cr-5.8%Mo-0.2%Hf, the raw materials are electrolytic nickel (99.9%), metal aluminum (99.9%), chromium (99.5%), Molybdenum (99.99%) and hafnium (73.5%); smelted in a vacuum induction furnace; after heat treatment process: 1 hour at 1050 ° C, cooling with the furnace.

[0026] Samples of various sizes are processed by wire cutting. The sample is heated to 900°C, treated with a 10T strong magnetic field for 45 minutes, removed from the magnetic field, and naturally cooled to room temperature.

[0027] The flexural strength of the sample is figure 1 As shown, the average flexural strength of the sample without magnetic field treatment is 245 MPa, while the average flexural strength of the sample treated with magnetic field is 430 MPa, an increase of 75%.

[0028] After the high magnetic field treatment, the fracture fracture morphology of the flexural strength test specimens changed significantly. T...

Embodiment 2

[0032] The nominal composition of the alloy is: Ni20Al30Fe, the raw materials are electrolytic nickel (99.9%), metal aluminum (99.9%), chromium (99.5%); smelted in a vacuum induction furnace; processed into samples of various sizes by wire cutting. The sample was heated to 700°C, treated with a 10T strong magnetic field for 35 minutes, removed the magnetic field, and cooled naturally to room temperature. At room temperature, the tensile yield strength is increased from about 600MPa to 720MPa, the tensile breaking strength is increased from about 800MPa to 900MPa, and the elongation at break is increased from 9% to 15%.

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Abstract

The present invention belongs to the field of strong magnetic field material modifying technology. Various NiAl alloy is limited in application owing to its low strength and toughness at room temperature. The present invention utilizes strong magnetic field to enhance the strength and toughness of NiAl alloy. For example, NiAlCr(Mo)Hf alloy after treatment in strong magnetic field has 100 % enhanced room temperature strength and 20 % raised room temperature elongation. By means of the modification of the present invention, various NiAl alloy may find its wide application in aeronautic engine, astronautic engine and other military and civil fields.

Description

technical field [0001] The invention belongs to the technical field of material modification with strong magnetic field. Background technique [0002] NiAl alloys have been one of the popular alloy materials researched at home and abroad in the past ten years. It has the characteristics of high high temperature strength and good oxidation resistance, and is expected to become a new type of high temperature structural material and be applied in the aerospace industry. However, most NiAl series have poor toughness, especially at room temperature, with low strength and toughness. Therefore, material scientists have adopted a variety of means to solve this problem, such as alloying, hot isostatic pressing, directional solidification, etc. to improve the strength and toughness of the alloy. However, the current improvement methods are limited, and the alloy has not yet reached Requirements. Contents of the invention [0003] The object of the present invention is to provide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F3/02C22C19/03C22C21/00
Inventor 吴承伟周文龙马国军郭杏林
Owner DALIAN UNIV OF TECH