High-performance copper alloy

A copper alloy, high-performance technology, applied in the field of high-performance copper alloys, can solve the problems that the alloy cannot meet high strength and high conductivity at the same time, the coarse primary second phase has no obvious improvement effect, and affects the conductivity of the alloy. The effect of preparing large-sized products, improving the success rate of milling, and inhibiting formation and growth

Active Publication Date: 2020-03-10
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The Cu-Cr-Zr alloy prepared by the casting forming method forms a coarse and hard second phase during the casting process, which is difficult to improve through deformation processing and affects the properties of the alloy
[0007] (2) Subsequent treatments such as solution treatment, deformation processing and aging can refine the structure, but have no obvious improvement effect on the coarse primary second phase formed by casting
[0008] (3) Mechanical ball milling can refine the structure, but the easily introduced impurities such as Fe, O, and C affect the conductivity of the alloy
[0009] The currently reported Cu-Cr-Zr alloys are easy to form a coarse hard second phase during solidification, which affects the properties of the alloy; through equal-diameter angular extrusion, multi-pass rolling, and aging treatment, the structure can be refined and the Cr Particle precipitation improves the performance of the alloy, but it is difficult to refine the primary phase; mechanical ball milling modification can increase the solid solubility of Cr and Zr and refine the second phase, but it will introduce a large amount of impurities and reduce the performance of the alloy
In short, the prepared alloy cannot meet the requirements of high strength and high electrical conductivity at the same time, especially the requirement that the electrical conductivity is greater than 75% and the strength is greater than 500MPa.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: Alloy powder preparation

[0057] Alloy raw materials are formulated according to the nominal composition of alloy A in Table 1, and pure metal Cu (purity is greater than or equal to 99.99%), Cr (purity is greater than or equal to 99.95%), Zr (purity is greater than or equal to 99.95%) and M (M is a mixture of RE (La: Ce: Yb = 1:3:1), Mg, Ag, B, the specific ratio is RE: Mg: Ag: B = 3:1:2:1) and other alloy raw materials Carry out vacuum melting, the vacuum degree is 5.0×10 -1 Pa, using argon protection; after the raw materials are melted and completely alloyed, adjust the melt temperature to about 1600°C, and then use argon to atomize to prepare powder, and the atomization pressure is 3.5MPa~3.6MPa.

[0058] The prepared powder chemical composition analysis results are shown in Table 1, and its particle size distribution is shown in Table 1. figure 1 , The median diameter of the powder is 28.2 μm (wherein the powder yield of the fine powder with a parti...

Embodiment 2

[0059] Embodiment 2: Alloy A1 and its preparation

[0060] The alloy powder prepared in Example 1 was subjected to sheath extrusion molding and post-treatment to prepare copper alloy material A1. The specific steps are as follows: (1) Put the powder into the copper sheath and vacuumize to 4×10 -1 Pa, and evacuate for 45 minutes in an environment of 80°C, and seal and weld; (2) Carry out hot extrusion molding of the enveloped powder, the extrusion temperature is 750°C, the extrusion ratio is 15:1, and the extrusion rate is 5mm / s; (3) Carry out forging deformation on the extruded sample, and the deformation amount is 10%; (4) Carry out aging heat treatment on the alloy ingot, the aging temperature is 450 ℃, and the aging time is 100 min; (5) The pre-deformed sample is subjected to 5 passes The second rolling, the rolling temperature is room temperature, and the total reduction is 70%; (6) The alloy ingot is subjected to aging heat treatment, the aging temperature is 300° C., an...

Embodiment 3

[0061] Embodiment 3: Alloy A2 and its preparation

[0062] The alloy powder prepared in Example 1 was subjected to sheath extrusion molding and post-treatment to prepare copper alloy material A2. The specific steps are as follows: (1) Put the powder into the copper sheath and vacuumize to 5×10 -1 Pa, and evacuated for 60 minutes in an environment of 70°C, and sealed and welded; (2) Hot-extruded the sheathed powder, the extrusion temperature was 850°C, the extrusion ratio was 20:1, and the extrusion rate was 10mm / s; (3) Carry out forging deformation on the extruded sample, and the deformation amount is 10%; (4) Carry out aging heat treatment on the alloy ingot, the aging temperature is 450 ℃, and the aging time is 100 min; (5) The pre-deformed sample is subjected to 5 passes The first rolling, the rolling temperature is room temperature, and the total reduction is 80%; (6) The alloy ingot is subjected to aging heat treatment, the aging temperature is 300 ° C, and the aging tim...

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Abstract

The invention relates to a high-performance copper alloy, and belongs to the field of copper alloy materials and powder metallurgy. The copper alloy comprises Cu, Cr, Zr and M according to the mass percentages of 0.1% to 5.0% of Cr, 0.1% to 5.0% of Zr, and 0.05% to 0.5% of M. M is composed of Re and at least two elements of Mg, Ag, B, Ga, Si, Li, Ti, Fe and Mn. RE is composed of at least three elements of Ce, La, Yb, Pr, Nd and Sm. According to the high-performance copper alloy, the Cu-Cr-Zr-M copper powder is prepared by adopting a gas atomization technology, a supersaturated solid solution with uniform ingredients and fine microstructures is obtained, then the powder is subjected to extrusion molding with a powder sheath and heat treatment, and the Cu-Cr-Zr-M copper powder with excellentperformance is prepared. The high-performance copper alloy is reasonable in component designing, and simple and controllable in preparation technology, a product is good in performance, and large-scale industrial application is facilitated.

Description

technical field [0001] The invention relates to a high-performance copper alloy, which belongs to the field of copper alloy materials and powder metallurgy. [0002] technical background [0003] Cu-Cr-Zr alloy has excellent electrical conductivity, thermal conductivity, corrosion resistance and high strength, and is widely used in electrical, electronic, transportation and machinery manufacturing fields. However, Cr and Zr elements are difficult to dissolve in the Cu matrix and have active chemical properties. It is easy to preferentially form a refractory hard second phase during the solidification process, resulting in uneven alloy composition and structure, and it is difficult to improve through subsequent treatment, thereby reducing Alloy comprehensive performance. [0004] In this regard, Mishnev et al [Mishnev R, Shakhova I, Belyakov A, et al. Materials Science and Engineering: A, 2015, 629: 29-40] improved Cu-0.87% Cr- The comprehensive properties of the 0.06% Zr al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/04C22F1/08
CPCC22C1/0425C22C9/00C22F1/08
Inventor 刘祖铭赵凡黄伯云吕学谦李全彭凯
Owner CENT SOUTH UNIV
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