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

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...

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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 engineering application of ultrafine-grained materials

[0003] The main reason for the low plasticity is that the grain size is small and the dislocation density has reached saturation, which makes the ultra-fine grained material lack of work hardening ability and fractures prematurely