A kind of short-process preparation method of high-strength and high-conductivity cu-cr-ag alloy

Abstract

The invention provides a non-solid-solution treatment short-process preparing method for a high-performance Cu-Cr-Ag alloy. A Cu-Cr-Ag alloy rod billet is prepared and obtained through up-drawing continuous casting, and the up-drawing temperature is 1200-1250 DEG C; multi-pass drawing is conducted; aging is conducted; and final drawing is conducted. The supersaturated solute atomic concentration is obtained through the fast-cooling process of up-drawing continuous casting, solid solution treatment is not conducted, solute atoms are promoted to precipitate directly through matching of subsequent drawing and the aging technology, the recrystallization degree is controlled synchronously to retain a certain machining hardening effect, and through strengthening mechanisms of solid-solution strengthening, aging precipitation phase strengthening and cold work hardening, and the purpose of preparing the high-strength and high-conduction softening-resisting Cu-Cr-Ag alloy can be achieved without solid solution treatment. The tensile strength of materials can reach 500-755 MPa, the conductivity is 70-85% IACS, the elongation is 1-14%, and the softening temperature can reach 550-600 DEG C. The short-process preparing method has the characteristics of the short process, high efficiency and low energy consumption, and the prepared Cu-Cr-Ag alloy can meet the practical application demand ofthe fields such as semiconductors and rail traffic.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal processing, and in particular relates to a method for preparing high-performance Cu-Cr-Ag alloy wires in a short process. Background technique [0002] Because of its excellent electrical and thermal conductivity, copper and its alloys are widely used in rail transit, aerospace, energy and power, electronic appliances and other fields, such as contact wires for high-speed rail and lead frame materials for semiconductors. The mechanical properties of pure copper are low, and it is difficult to meet the requirements for the mechanical properties of materials in the above fields. The study found that the alloy strength can be significantly improved by adding alloying elements, heat treatment and plastic deformation. However, in most cases, as the strength increases, the conductivity of the material decreases with an inverse strength-conductivity relationship. Therefore, it is difficult to achieve t...

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Problems solved by technology

In the production process, the solution treatment operation is complicated, which not only consumes a lot of energy and increases the production cost, but also, the solution treatment under high temperature conditions can easily cause severe oxidation of the alloy surface, resulting in material loss and affecting the properties of the alloy. In addition, the quenching process The alloy is required to be cooled rapidly in a short period of time, otherwise it will be difficult to obtain effective supersaturated solid solubility. However, copper alloy products produced on a large scale, such as long-length wires, heavy coils and strips, are limited by their own shape and size. It is difficult to obtain the same cooling rate in each part of the alloy, especially there is a significant difference in cooling rate between the head and the tail, the surface and the core, which causes the difficulty of controlling the stability of the alloy structure and properties, and severely limits the aging strengthening of Cu-Cr. -Scale production and application of Ag alloy

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