Method for effectively improving strength and conductivity of alloy

A technology for alloy strength and electrical conductivity, applied in the field of alloys, can solve the problems of NiTi phase annealing twins, electrical conductivity improvement, strength reduction, etc., and achieve the effect of excellent comprehensive performance

Pending Publication Date: 2022-03-08
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ultimately, the formation of these phases reduces the solid solubility of Ti in the Cu matrix, resulting in enhanced electrical conductivity.
In addition, after adding a certain amount of Ni to Cu-3Ti alloy, in addition to transforming the microstructure of the as-cast alloy from dendrite to equiaxed, the aging process will also lead to the appearance of annealing twins in the residual NiTi phase.
Changes in the structure of the alloy will eventually lead to an increase in the electrical conductivity of the alloy, but the strength will decrease

Method used

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  • Method for effectively improving strength and conductivity of alloy
  • Method for effectively improving strength and conductivity of alloy
  • Method for effectively improving strength and conductivity of alloy

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preparation example Construction

[0034] like figure 1 As shown, the preparation method of the present invention includes the following steps: preparing alloy ingots by vacuum smelting→homogenizing heat treatment→low temperature hot rolling→multiple cycles of ultra-low temperature deep cold rolling deformation→short-time solution quenching treatment→low temperature short-time pre-aging treatment→ Multiple cycles of ultra-low temperature deep cold rolling deformation → isothermal aging treatment can not only control the grain structure of copper alloy, but also significantly induce the number and density of precipitates in the peak aging state of the alloy, and finally make the copper alloy have both high strength and high electrical conductivity.

[0035] The raw materials are 99.9wt% electrolytic high-purity Cu, sponge Ti and other intermediate alloys and pure metals. First, the alloy is smelted in a vacuum intermediate frequency induction furnace. The specific chemical compositions of the alloys used in the...

Embodiment 1

[0045] According to the design value of the composition of alloy 1#, the alloy is first smelted in a vacuum intermediate frequency induction furnace; then the ingot of the invented alloy is subjected to homogenization heat treatment (temperature: 750-850°C, time: 15-30h), and then multi-process thermal processing Coupling control, the specific treatment process is as follows: firstly, the homogenized ingot is subjected to low-temperature hot-rolling deformation, the rolling start temperature: 710-750°C, the holding time: 0.1-1h, the deformation amount: 45-80%, and the deformation method: Unidirectional rolling, pass reduction: 3-15%, final rolling temperature: greater than 500°C; and then carry out multiple cycles of ultra-low temperature deep cold rolling deformation treatment on the hot-rolled sheet, the number of low-temperature deformation cycles is greater than 10 times, first Place it in the liquid nitrogen tank for more than 30 minutes, and then carry out ultra-low tempe...

Embodiment 2

[0047] According to the composition design value of the inventive alloy 2#, the alloy is first smelted in a vacuum intermediate frequency induction furnace; then the ingot of the inventive alloy is subjected to a homogenization heat treatment (temperature: 750-850°C, time: 15-30h), and then heat processed for more Process coupling control, the specific treatment process is as follows: firstly, the ingot after homogenization treatment is subjected to low-temperature hot rolling deformation, rolling start temperature: 710-750°C, holding time: 0.1-1h, deformation amount: 45-80%, deformation method : Unidirectional rolling, pass reduction: 3-15%, final rolling temperature: greater than 500°C; then the hot-rolled sheet is subjected to multiple cycles of ultra-low temperature deep cold rolling deformation treatment, and the number of low-temperature deformation cycles is greater than 10 times. First place it in a liquid nitrogen tank for more than 30 minutes, and then carry out ultra...

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Abstract

The invention provides a preparation method for improving alloy strength and conductivity, which is particularly suitable for Cu-Ti alloy, and the Cu-Ti alloy strength and conductivity can be improved through multi-process integrated coupling regulation and control of component design, casting, homogenization, low-temperature hot rolling, multi-cycle ultralow-temperature cold rolling, short-time solid solution quenching, low-temperature short-time pre-aging treatment, multi-cycle ultralow-temperature deep cold rolling and isothermal aging. After short-time aging treatment, the hardness of the alloy is larger than 340 HV, the tensile strength can reach 1110.4 MPa, the conductivity is close to 14% IACS, and the elastic modulus reaches 127 GPa. After further aging, the hardness is reduced slowly, a secondary peak value appears, the peak hardness is close to 340 HV, the tensile strength can still reach 1091.3 MPa, the conductivity is larger than 15% IACS, and the elastic modulus is 114.2 GPa. The preparation method developed by the invention is very suitable for manufacturing high-strength elastic copper alloy materials for typical components in numerous high-tech fields such as electronic industry, aerospace, instruments and meters, household appliances and the like, and is particularly suitable for manufacturing complex-shaped parts with relatively good requirements on strength, elasticity, conductivity and the like.

Description

technical field [0001] The invention belongs to the technical field of alloys, and in particular relates to a method for effectively improving alloy strength and electrical conductivity. Background technique [0002] With the rapid development of modern electronic industry technology, electronic components are developing in the direction of high performance, precision and miniaturization, which puts forward higher requirements for the elasticity, strength, conductivity and reliability of the materials used. Although beryllium bronze has excellent elasticity, strength, wear resistance and electrical conductivity, etc., it also has low stress relaxation characteristics, and has been widely used in many high-tech fields such as electronics industry, aerospace, instrumentation and household appliances. But this series of alloys still has the following problems, such as the harmful effects of smoke, steam, and dust of beryllium and its compounds on human health, high production c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22F1/08C21D1/18C22C1/03B21B37/74B21B3/00C22C9/00
CPCC21D8/0226C21D8/0247C21D8/0221C22F1/08C22F1/002C22C1/03B21B37/74B21B3/00C22C9/00B21B2003/005
Inventor 莫永达王虎郭明星娄花芬刘宇宁祝儒飞陈忠平向朝建王苗苗
Owner KUNMING METALLURGY INST
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