High strength superfine crystalloid copper-germanium alloy and preparation method thereof

A copper-germanium alloy and ultra-fine-grained technology, which is applied in the field of high-strength ultra-fine-grained copper-germanium alloy, ultra-fine-grained bulk metal material and its preparation, and the preparation of ultra-fine-grained copper-germanium alloy by low temperature and large plastic deformation, can solve the problem of low Plasticity, tensile plasticity is low, limit the engineering application of ultra-fine grain materials, etc., to achieve the effect of excellent mechanical properties and high strength

Inactive Publication Date: 2012-07-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that the grain size of metal materials prepared by large plastic deformation can be reduced to below 1 μm, and the strength can be greatly improved, but the tensile plasticity at room temperature is very low.
This greatly limits the engineerin...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A. After mixing pure copper with a purity of 99.95% and pure germanium with a purity of 99.99%, the mass percentage of copper is 99.89%, and the mass percentage of germanium is 0.11%. Melting is carried out in an intermediate frequency induction melting furnace and cast into a copper-germanium alloy bar;

[0021] B. Carrying out conventional vacuum annealing at 840° C. for 2 hours to the copper-germanium alloy rod obtained in step A;

[0022] C. At a temperature of 800°C and a deformation rate of 10 -4 / s~10 2 Under the condition of / s, conventional forging is carried out to the copper-germanium alloy bar gained in step B;

[0023] D, the copper-germanium alloy obtained in step C is subjected to conventional vacuum annealing at 840° C. for 2 hours to eliminate internal stress and obtain a uniform microstructure;

[0024] E. Immerse the copper-germanium alloy obtained in step D in liquid nitrogen and cool it until the temperature of the alloy itself reaches the liqu...

Embodiment 2

[0027] A. Pure copper with a purity of 99.99% and pure germanium with a purity of 99.95% are mixed according to a mass percentage of copper of 93.54% and a mass percentage of germanium of 6.46%, followed by melting and casting into copper-germanium alloy rods;

[0028] B. Carrying out conventional vacuum annealing at 840° C. for 2 hours to the copper-germanium alloy rod obtained in step A;

[0029] C. At a temperature of 800°C and a deformation rate of 10 -4 / s~10 2 Under the condition of / s, conventional forging is carried out to the copper-germanium alloy bar gained in step B;

[0030] D, the copper-germanium alloy obtained in step C is subjected to conventional vacuum annealing at 840° C. for 2 hours to eliminate internal stress and obtain a uniform microstructure;

[0031] E. Immerse the copper-germanium alloy obtained in step D in liquid nitrogen and cool it until the temperature of the alloy itself reaches the liquid nitrogen temperature and then take it out;

[003...

Embodiment 3

[0034] A. Pure copper with a purity of 99.96% and pure germanium with a purity of 99.98% are mixed according to a mass percentage of copper of 89.85% and a mass percentage of germanium of 10.15%, followed by melting and casting into copper-germanium alloy rods;

[0035] B. Carrying out conventional vacuum annealing at 840° C. for 2 hours to the copper-germanium alloy rod obtained in step A;

[0036] C. At a temperature of 800°C and a deformation rate of 10 -4 / s~10 2 Under the condition of / s, conventional forging is carried out to the copper-germanium alloy bar gained in step B;

[0037] D, the copper-germanium alloy obtained in step C is subjected to conventional vacuum annealing at 840° C. for 2 hours to eliminate internal stress and obtain a uniform microstructure;

[0038] E. Immerse the copper-germanium alloy obtained in step D in liquid nitrogen and cool it until the temperature of the alloy itself reaches the liquid nitrogen temperature and then take it out;

[00...

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Abstract

The invention provides a high strength superfine crystalloid copper-germanium alloy and a preparation method thereof. The high strength superfine crystalloid copper-germanium alloy consists of the following components in percentage by mass: 99.89 to 89.85 percent of copper, and 0.11 to 10.15 percent of germanium. The preparation method comprises the following steps of: mixing pure copper and pure germanium in the proportion, smelting, and casting into a copper-germanium alloy bar; performing vacuum annealing, and forging; performing vacuum annealing again to obtain a homogenous microstructure; and immersing in liquid nitrogen for cooling, and forging to obtain the deformation twins-containing high-strength superfine crystalloid copper-germanium alloy. The stacking fault energy of the copper is reduced by adding the germanium element, and a large quantity of deformation twins are introduced, so that the copper-germanium alloy has high strength and excellent mechanical properties. Through the simple preparation process, the copper-germanium alloy with the tensile strength at room temperature of 467-802MPa can be obtained.

Description

technical field [0001] The invention relates to an ultrafine-grain bulk metal material and a preparation method thereof, in particular to a high-strength ultrafine-grain copper-germanium alloy and a method for preparing an ultrafine-grain copper-germanium alloy by using low-temperature large plastic deformation, which belongs to the ultrafine-grain The field of metal material processing technology. Background technique [0002] Usually, methods for strengthening metals include solid solution strengthening, dispersion strengthening, work hardening, and fine-grain strengthening, among which fine-grain strengthening reflects the relationship between grain size and material strength (Hall-Petch relationship), and is the only method that can simultaneously increase strength and improve Effective means of plasticity and toughness. At present, the Severe Plastic Deformation (SPD) method is usually used to prepare bulk ultrafine-grained materials with clean and dense interfaces. H...

Claims

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Application Information

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IPC IPC(8): C22C9/00C22C1/02C22F1/08
Inventor 龚玉兰朱心昆伞星源龙燕程莲萍吴小香
Owner KUNMING UNIV OF SCI & TECH
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