A high-density nano-twinned high-performance nickel-aluminum-bronze alloy plate and its preparation method

Abstract

The invention relates to a preparation method of nano-twinned high-performance nickel-aluminum bronze alloy. This method first carries out high-temperature solution treatment, and heat-preserves the original material of nickel-aluminum-bronze alloy at 920°C-950°C for 1-2h, and controls the high-temperature structure to be Cu 3 Al-based β phase solid solution and a small amount of fine k precipitated phase. Afterwards, carry out symmetrical continuous hot rolling with strong deformation, asymmetric medium temperature rolling with small deformation, and short-term heat treatment at 700°C to 800°C after deformation. After different heat treatment processes, the obtained structures are equiaxed face-centered cubic Cu-based solid solution α phase, Cu 3 Al-based martensite β'-phase dual-phase structure, and intermetallic compound k-phase dispersedly distributed. The ratio and grain size of each phase can be adjusted according to the rolling and heat treatment process to obtain mechanical properties and physical and chemical properties suitable for different working scenarios. The grain size of α phase and β' phase can be refined to about 300nm. In the α phase of the material, the annealed twin boundary accounts for 30% to 80% of the entire interface, and the width of the twin crystal layer is 30nm to 300nm. The material has a yield strength of not less than 800MPa, a tensile strength of up to 1150MPa, and an elongation at break of not less than 14%. Compared with the prior art, the method of the invention can greatly improve the comprehensive mechanical properties of the nickel-aluminum-bronze alloy, has simple process, is easy to implement, has low production cost, and can realize the preparation of bulk materials in large quantities.

Description

technical field [0001] The invention belongs to the technical field of copper alloy material processing, and in particular relates to a high-strength and high-plasticity nickel-aluminum bronze alloy plate and a preparation method thereof. Background technique [0002] Compared with the traditional binary aluminum bronze alloy, the strength, wear resistance and corrosion resistance of the nickel aluminum bronze alloy have been further improved due to the addition of alloying elements such as iron and nickel. As a copper-based alloy structural material, nickel-aluminum bronze has excellent performances that cannot be replaced by traditional steel materials in terms of electrical conductivity, thermal conductivity, and corrosion resistance. At present, nickel-aluminum-bronze alloys have been widely used in important parts such as propellers, propellers, and valves in the aviation industry and marine industry, and can also be used to make high-strength wear-resistant parts that ...

AI Technical Summary

Problems solved by technology

At present, relying on deformation heat treatment to introduce high-density ultra-fine annealing twins to improve the comprehensive mechanical properties of materials is rarely used in nickel-aluminum-bronze alloys.

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