High-performance CuNiSiTiBMg-series elastic copper alloy and preparation method thereof

Abstract

The invention provides a high-performance CuNiSiTiBMg-series elastic copper alloy and a preparation method of the high-performance CuNiSiTiBMg-series elastic copper alloy. The high-performance CuNiSiTiBMg-series elastic copper alloy comprises the ingredients of, in percentage by weight, 8.0-12.0% of Ni, 2.0-3.0% of Si, 0.5-2.0% of Ti, 0.02-0.5% of B, 0.2-0.3% of Mg and the balance Cu and inevitable impurities. The elastic copper alloy is reasonable in ingredient, strengthening phases in the alloy are uniformly distributed, and the high-performance CuNiSiTiBMg-series elastic copper alloy has the characteristics of being high in strength, good in plasticity, high in specific conductance and excellent in stress relaxation resistance. The preparation method of the elastic copper alloy comprises the steps of continuous casting and rolling, hot rolling, solution treatment, cold rolling, aging treatment, multiple times of pack rolling, low tempering and the like. The preparation method has the characteristics that energy is saved, consumption is lowered, the production cost is lower, and the process is simpler, and the preparation method is more suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of elastic alloys and their preparation, in particular to a high-performance CuNiSiTiBMg-based elastic copper alloy and a preparation method thereof. Background technique [0002] Elastic copper alloy is the key material for conductive elastic devices. When it is used in ships, aerospace, electrical and electronics, machine instruments, automobile industry, rail transportation, ocean transportation and other fields, it requires high performance, including tensile strength. The strength is greater than 1100MPa, the elongation is greater than 8%, and the electrical conductivity is greater than 20% IACS, etc.; although the elastic copper alloy prepared by traditional process steps such as melting and casting, hot rolling, solid solution, and cold rolling has high strength and good electrical conductivity , but the plasticity is not enough to meet the needs of the current industry. [0003] In recent years, res...

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Problems solved by technology

[0002] Elastic copper alloy is the key material for conductive elastic devices. When it is used in ships, aerospace, electrical and electronics, machine instruments, automobile industry, rail transportation, ocean transportation and other fields, it requires high performance, including tensile strength. The strength is greater than 1100MPa, the elongation is greater than 8%, and the electrical conductivity is greater than 20% IACS, etc.; although the elastic copper alloy prepared by traditional process steps such as melting and casting, hot rolling, solid solution, and cold rolling has high strength and good electrical conductivity , but the plasticity is not enough to meet the needs of the current industry

[0003] In recent years, research on the performance improvement of elastic copper alloys has made some progress, but there are still some shortcomings, such as limited mechanical properties or deformable processing of the alloy, and there are problems of high cost pressure and low economic benefits in production. Meet the application requirements of industrial production:

[0004] (1) The published Chinese patent "Ultra-high-strength, high-conductivity CuNiSiSnMg-based elastic copper alloy and its preparation method" (200810032004.2) provides a CuNiSiSnMgZr alloy with ultra-high strength, good electrical conductivity and excellent resistance to stress relaxation performance, but there are some deficiencies in its preparation process, such as the serious segregation of the ingot due to the addition of Sn element, which requires a long time for homogenization treatment; it is difficult to control the heating rate in the two-stage solution treatment process, and it is difficult to realize large; and the non-vacuum secondary remelting process is difficult to produce on a large scale and industrially

[0005] (2) Chinese patent "Cu-Ni-Si-Mg alloy with improved electrical conductivity and bendability" (201080002157.8) discloses a Cu-Ni-Si-Mg alloy containing 1.0-4.5% Ni, 0.16-0.13% of Si and 0.05-0.3% of Mg, more preferably 0.01-2.0% by mass of Cr, P, Mn, Ag, Co, Mo, As, Sb, Al, Hf, Zr, C, Fe , At least one of In, Ta, Sn, Zn, the number of Ni-Si compounds contained in the alloy is small, and the precipitated phase is only Ni 2 Si is the main type, the volume fraction of the precipitated phase is limited and the size of the precipitated phase is easy to grow, some of the precipitated phases reach 0.05-3.0 microns, and the effect of Orowan strengthening on the precipitated phase particles above 0.05 microns is significantly reduced, so The strengthening ability of this alloy is limited, and the tensile strength of the alloy is only 760-801MPa, which is only a medium-strength copper alloy.

[0006] (3) The Chinese patent "A CuNiSi-based Elastic Copper Alloy and Its Preparation Method" (201310025570.1) discloses a Cu-Ni-Si-based elastic copper alloy in which the content of Ni and Si is low (Ni is 3.8-5.0 %, Si is 0.6-1.3%), the number of Ni-Si compounds formed is small, and the volume fraction of the precipitated phase is low so that the strengthening effect is limited

This process significantly shortens the traditional process flow, but the multi-pass cold rolling in this process is mainly to reduce the thickness of the sample, prepare the shape and size for the subsequent aging treatment of the strip, and has limited strengthening of the alloy; and the process is only It is suitable for the production of medium-strength conductive Cu-Ni-Si alloy (C70250) and Cu-Cr-Zr alloy (C70350) with low precipitate content and excellent cold rolling performance, or some require high strength but low plasticity requirements ( Generally less than 6%) copper alloy products

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