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High-strength and high-conductivity Cu-Cr-Nb alloy with double-peak grain size and double-scale nano-phase reinforcing function

A cu-cr-nb, grain size technology, applied in metal processing equipment, additive manufacturing, transportation and packaging, etc. The effect of high electrical conductivity and high plastic electrical conductivity

Active Publication Date: 2021-02-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above work does not involve how to simultaneously improve the strength, plasticity, and electrical conductivity of Cu-Cr-Nb alloys

Method used

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  • High-strength and high-conductivity Cu-Cr-Nb alloy with double-peak grain size and double-scale nano-phase reinforcing function
  • High-strength and high-conductivity Cu-Cr-Nb alloy with double-peak grain size and double-scale nano-phase reinforcing function
  • High-strength and high-conductivity Cu-Cr-Nb alloy with double-peak grain size and double-scale nano-phase reinforcing function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Preparation of copper alloy powder suitable for SLM

[0046] Put electrolytic pure copper and Cr-Nb intermediate alloy raw materials into a vacuum induction melting furnace for melting; when the raw materials are melted and completely alloyed, vacuum degassing is carried out at 1580 ° C for 10 minutes, and then the fully alloyed melt is melted at 3.5kg / The flow rate of min is introduced into the close-coupled gas atomization furnace through the guide tube, the atomization temperature is controlled at 1600°C, the atomization medium pressure is 3.5MPa, and high-purity argon (purity 99.99wt%) is used as the atomization medium to spray The liquid flow is crushed into fine droplets, and after cooling and rapid solidification, Cu-Cr-Nb alloy powder is formed; finally, the required Cu-Cr- Nb alloy powder, packaged in a reducing atmosphere with a hydrogen content of 3v% and an argon content of 97v%. The content of Cr in the alloy powder is 2.3 at%, the content of Nb is 1 a...

Embodiment 2

[0056] (1) Preparation of copper alloy powder suitable for SLM

[0057] Put the electrolytic pure copper and Cr-Nb intermediate alloy into the vacuum induction melting furnace for melting; when the raw materials are melted and completely alloyed, carry out vacuum degassing at 1590°C for 10 minutes, and then melt the fully alloyed melt at 3.5kg / min The flow rate is introduced into the close-coupled gas atomization furnace through the guide tube, the atomization temperature is controlled at 1600°C, the atomization medium pressure is 3.5MPa, and high-purity argon (purity 99.99wt%) is used as the atomization medium to spray the metal liquid The flow breaks into fine droplets, and after cooling and rapid solidification, Cu-Cr-Nb alloy powder is formed; finally, the required Cu-Cr-Nb is screened out by using a nitrogen screening device and ultrasonic vibration screening at low temperature. The alloy powder is packaged in a reducing atmosphere with a hydrogen content of 2v% and an ar...

Embodiment 3

[0067] (1) Preparation of copper alloy powder suitable for SLM

[0068] Put the electrolytic pure copper and Cr-Nb intermediate alloy into the vacuum induction melting furnace for melting; when the raw materials are melted and completely alloyed, carry out vacuum degassing at 1580°C for 10 minutes, and then melt the fully alloyed melt at 3.5kg / min The flow rate is introduced into the close-coupled gas atomization furnace through the guide tube, the atomization temperature is controlled at 1600°C, the atomization medium pressure is 3.5MPa, and high-purity argon (purity 99.99wt%) is used as the atomization medium to spray the metal liquid The flow breaks into fine droplets, and after cooling and rapid solidification, Cu-Cr-Nb alloy powder is formed; finally, the required Cu-Cr-Nb is screened out by using a nitrogen screening device and ultrasonic vibration screening at low temperature. The alloy powder is packaged in a reducing atmosphere with a hydrogen content of 2v% and an ar...

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Abstract

The invention provides a high-strength and high-conductivity Cu-Cr-Nb alloy with a double-peak grain size and a double-scale nano-phase reinforcing function, and belongs to the field of additive manufacturing and high-strength and high-conductivity copper alloys. In the designed alloy, the contents of Cr and Nb are 2.0-2.8 at% and 1-1.3 at% correspondingly, the atomic ratio of Cr to Nb is controlled to be slightly greater than 2:1, and a copper matrix is reinforced by nanophases such as a Cr2Nb phase and a Cr phase. According to the alloy, the high-performance Cu-Cr-Nb alloy with the double-peak grain size and the double-scale nano-phase reinforcing function is prepared through the cooperation of selective laser melting and a special heat treatment process. The tensile strength of the prepared Cu-Cr-Nb alloy at room temperature is larger than 800 MPa, the yield strength of the Cu-Cr-Nb alloy is larger than 710 MPa, the microhardness of the Cu-Cr-Nb alloy is not lower than 256 HV, the elongation of the Cu-Cr-Nb alloy is not lower than 25%, and the conductivity of the Cu-Cr-Nb alloy is not lower than 70% IACS. The tensile strength at 700 DEG C is 145-155 MPa.

Description

technical field [0001] The invention provides a high-strength and high-conductivity Cu-Cr-Nb alloy with bimodal grain size and dual-scale nanophase strengthening, which belongs to the field of additive manufacturing and copper alloys. Background technique [0002] Copper alloys are widely used in aerospace, electronics, transportation and other fields due to their excellent comprehensive physical and mechanical properties. Through alloying, heat treatment, deformation processing, etc., Cu-Fe-P system, Cu-Cr-Zr system, Cu-Ni-Si system, Cu-Ag-Zr system, Cu-Cr-Nb system and copper matrix composite materials, etc. A variety of copper alloys have been successfully developed. Among them, Cu-Cr-Nb alloy has become an important structural functional material in the field of aerospace and nuclear energy due to its good strength, creep performance, high thermal conductivity, low cycle fatigue performance and high temperature stability. With the continuous development of the industri...

Claims

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Application Information

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IPC IPC(8): C22C9/00C22C1/04C22F1/02C22F1/08B22F9/08B22F1/00B22F10/28B22F3/24B33Y10/00B33Y70/00B33Y40/20B33Y40/10
CPCC22C9/00C22C1/0425C22F1/02C22F1/08B22F9/082B22F3/24B33Y10/00B33Y70/00B33Y40/20B33Y40/10B22F2003/248B22F1/14
Inventor 刘祖铭任亚科吕学谦魏冰周旭农必重卢思哲艾永康曹镔
Owner CENT SOUTH UNIV
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