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Method for improving high-temperature mechanical property of Ni3Al alloy

A high-temperature mechanics and alloy technology, applied in the field of alloy material processing, can solve problems such as industrial application limitations and brittle fracture of alloys

Active Publication Date: 2021-08-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although increasing the Al content and introducing the β(NiAl) phase can gain advantages in melting point and density, the brittle and hard β phase and the intrinsically brittle β / γ′ two-phase interface easily lead to brittle fracture of the alloy, making Al-rich Ni 3 The industrial application of Al-based alloys is greatly limited

Method used

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  • Method for improving high-temperature mechanical property of Ni3Al alloy
  • Method for improving high-temperature mechanical property of Ni3Al alloy
  • Method for improving high-temperature mechanical property of Ni3Al alloy

Examples

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Effect test

Embodiment 1

[0042] The improvement Ni provided by this embodiment 3 The method for high temperature mechanical properties of Al alloy, the steps are as follows:

[0043] Ni with a diameter of 10 mm and a length of 120 mm 3 The Al alloy rod was ground to remove the oxide film, and then placed in a corundum tube in a Bridgman directional solidification device of the corresponding size, and the temperature was raised to 1550 °C at a heating rate of 7.5 °C / min. 3 Al alloy rods were smelted for 45min to obtain Ni 3 Al alloy melt; wherein, the Ni 3 The composition of the Al alloy rod is: Ni, Al, Zr and B, and the ratio of the amount of the substances is 73:26.5:0.4:0.1.

[0044] The Ni obtained by the above steps 3 The Al alloy melt is pulled into the Ga-In-Sn liquid alloy at a pulling rate of 10μm / s under the condition of applying a steady magnetic field of 0.5T intensity parallel to the direction of directional solidification to control the solid / liquid interface of directional solidifica...

Embodiment 2

[0046] The treatment was carried out according to the method of Example 1, except that the strength of the steady magnetic field was 0.7T.

Embodiment 3

[0048] The treatment was carried out according to the method of Example 1, except that the pulling rate was 15 μm / s.

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Abstract

The invention provides a method for improving the high-temperature mechanical property of a Ni3Al alloy, and belongs to the technical field of alloy material processing. According to the method, a stable magnetic field parallel to the directional solidification direction is applied in the directional solidification process, the strength of the stable magnetic field and the pulling rate of directional solidification are readjusted, the magnetic field effect is changed by utilizing the thermoelectric magnetic effect caused by the interaction of the magnetic field and the thermocurrent and controlling the pulling rate, that is to say, under the synergistic effect of the magnetic field intensity and the pulling rate, the morphology, orientation and distribution of NiAl dendritic crystals in a melt are improved, the columnar dendritic crystals which are regularly arranged originally exist in the form of particles, meanwhile, the particles retain certain preferred orientation, Ni3Al among the dendritic crystals always keeps a single-crystal matrix, therefore, a composite structure composed of the oriented NiAl particles and the single-crystal Ni3Al matrix is generated, and the high-temperature mechanical property of the Ni3Al alloy is effectively improved.

Description

technical field [0001] The invention relates to the technical field of alloy material processing, in particular to a method for improving Ni 3 A method for the high temperature mechanical properties of Al alloys. Background technique [0002] Ni 3 Because the main metallographic structure of Al alloy is the intermetallic compound Ni 3 Al phase is a hard and brittle phase, so it is difficult to show better performance in high temperature environment. After years of research, a batch of Ni-based 3 A series of alloys that use Al as the matrix and strengthen alloying elements by adding B, Cr, Hf, Zr, etc., but currently only Ni-rich Ni 3 Al-based alloys (γ / γ′) are put into industrial applications, and their melting point and density are still not much improved compared with traditional nickel-based superalloys. Although increasing the Al content and introducing the β(NiAl) phase can gain advantages in melting point and density, the brittle and hard β phase and the intrinsic...

Claims

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Application Information

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IPC IPC(8): C22F3/02
CPCC22F3/02
Inventor 帅三三王江任忠鸣刘鑫尹莉吴士俊
Owner SHANGHAI UNIV