Method for simultaneously improving strength and electric conductivity of Cu-Cr-Nb alloy

A cu-cr-nb, alloy strength technology, applied in the field of copper alloy and powder metallurgy materials, can solve the problems of no obvious change in conductivity, no reported strength data, etc., achieve size reduction, optimize alloy composition, and simple process method Effect

Active Publication Date: 2021-03-26
CENT SOUTH UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Chinese patents 201710736572.X and 201710737221.0 disclose a Cu-Cr-Nb alloy melting casting / heat treatment preparation method, the percentage content of Cr in the prepared alloy is ≤1.5wt.%, and the percentage content of Nb is ≤0.5wt.%. , conductivity about 82.5% IACS, hardness about 135HB, no strength data reported
Loewenthal et al. studied the effect of deformation processing on the properties of Cu-8Cr-4Nb alloy, and found that after deformation processing, the strength of Cu-8Cr-4Nb alloy increased, but the electrical conductivity did not change significantly [Loewenthal WS, NASA / TM—2008-215213; Ellis D L, NASA / CR-2012-217128; Shukla A K, et al. Materials Science and Engineering: A, 577 (2013) 36]

Method used

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  • Method for simultaneously improving strength and electric conductivity of Cu-Cr-Nb alloy
  • Method for simultaneously improving strength and electric conductivity of Cu-Cr-Nb alloy
  • Method for simultaneously improving strength and electric conductivity of Cu-Cr-Nb alloy

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Experimental program
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Effect test

Embodiment 1

[0060] Embodiment 1: the preparation of alloy A-1 (composition is shown in A in table 1)

[0061] Step 1, using water-cooled copper crucible magnetic levitation smelting, gas atomization method to prepare alloy powder A (the composition of the powder is shown in A-1 in the table, wherein M is a mixture of RE, B, Ti, wherein RE is Ce, La, Sc , Y, the mass is 12.5%, the mass percentage of B is 17%, and the balance is Ti), the melting temperature is 1650±30°C, the median diameter of the prepared powder is 33.7 μm, and the particle size of the powder is less than 75 μm The proportion is 86%.

[0062] Step 2. Preparation of alloy by spark plasma sintering

[0063] Put the alloy powder into the graphite mold, and then place the graphite mold with the alloy powder in the spark plasma sintering equipment; turn on the equipment, vacuumize to the set value, load the pressure and heat up, according to the set sintering temperature, pressure, time The powder is sintered and shaped under...

Embodiment 2

[0068] Embodiment 2: the preparation of alloy A-2 (composition is shown in A in table 1)

[0069] Step 1, powder preparation, with embodiment 1;

[0070] Step 2, powder forming, with embodiment 1;

[0071] Step three, deformation heat treatment

[0072]The deformation heat treatment method is thermal deformation / heat treatment / thermal deformation / secondary heat treatment, the deformation method is rolling, the deformation temperature is 600°C, the total deformation amount of the initial deformation is 40%, the single deformation amount is 2.5%, and the heat treatment temperature is 475 ℃, the time is 120min, the total deformation of the secondary deformation is 40%, the single deformation is 2.5%, the secondary heat treatment temperature is 350 ℃, and the time is 60min.

[0073] The microstructure of the as-prepared alloy is as Figure 5-7 , it can be seen from the figure that the multiscale second phase in the alloy is small in size and evenly distributed, and the matrix f...

Embodiment 3

[0075] Embodiment 3: the preparation of alloy A-3 (composition is shown in A in table 1)

[0076] Step 1, powder preparation, with embodiment 1;

[0077] Step 2, powder forming, with embodiment 1;

[0078] Step three, deformation heat treatment

[0079] The deformation heat treatment method is thermal deformation / heat treatment / cold deformation / secondary heat treatment, the deformation method is rolling, the deformation temperature of hot deformation is 600°C, the deformation temperature of cold deformation is room temperature, the total deformation of the initial deformation is 40%, and the single deformation The amount is 2.5%, the heat treatment temperature is 475°C, the time is 120min, the total deformation amount of the secondary deformation is 40%, the single deformation amount is 2.5%, the secondary heat treatment temperature is 350°C, and the time is 60min.

[0080] The microstructure of the as-prepared alloy is as Figure 7-11 , it can be seen from the figure that ...

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Abstract

The invention relates to a method for simultaneously improving the strength and electric conductivity of a Cu-Cr-Nb alloy. The alloy comprises the components with percent by weight: 0.5-5.0% of Cr, 0.5-5.0% of Nb, 0.01-1.00% of M and the balance copper, wherein M is at least three components selected from RE, B, P, Si, Ca, Zr, Li, Mg, Ti, Ni, Fe, Sn and Mn; and RE is at least one component selected from Ce, La, Y, Pr, Nd, Sm and Sc. The Cu-Cr-Nb-M alloy is prepared through powder formation and thermo-mechanical treatment. Under the combined action of microalloying, rapid solidification, rapiddensification and the thermo-mechanical treatment, the microscopic structure of the alloy is regulated; and under the synergistic action of various strengthening mechanisms, the strength of the alloyis improved, and the comprehensive performance of the alloy is improved. The size of the second phase in the alloy prepared by using the method is smaller than or equal to 0.50 micrometer; the secondphase is uniformly distributed; the room-temperature tensile strength of the alloy is equal to or higher than 450 Mpa; and the electric conductivity is equal to or higher than 80% IACS. The tensile strength is equal to or higher than 95 MPa at the high temperature of 700 DEG C; and it is achieved that the electric conductivity and the strength of the Cu-Cr-Nb alloy are simultaneously improved andwell matched.

Description

technical field [0001] The invention relates to a method for simultaneously improving the strength and electrical conductivity of Cu-Cr-Nb, which belongs to the field of copper alloy and powder metallurgy materials. Background technique [0002] Cu-Cr-Nb alloy has excellent mechanical properties, electrical and thermal conductivity and thermal stability. It is an ideal high temperature resistant structural / functional material and has good application prospects in the fields of aviation, aerospace and nuclear energy. The development of aerospace, nuclear energy and other technologies has put forward higher requirements for the comprehensive performance of high-temperature-resistant copper-based structural / functional materials. In addition to strength and thermal stability, higher electrical conductivity and thermal conductivity of materials are also required. Require. However, during the solidification process of the alloy melt, Cr reacts with Nb to form a high melting point...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/04C22F1/08B22F9/08
CPCC22C9/00C22C1/0425C22F1/08B22F9/082B22F2998/00B22F2009/0824B22F2201/11
Inventor 刘祖铭吕学谦艾永康李全任亚科周旭卢思哲曹镔
Owner CENT SOUTH UNIV
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