Nickel-based alloy with high-strength block nanostructure and preparation method thereof

Abstract

The invention provides a nickel-based alloy with a high-strength block nanostructure and a preparation method thereof, and relates to the technical field of nanostructure metal materials. According to the nickel-based alloy with the high-strength block nanostructure and the preparation method thereof provided by the invention, a traditional double-roller rolling mill is used for carrying out pass-by-pass rolling treatment on the low-layer fault energy face-centered cubic nickel-based alloy, the rolling deformation amount is accurately controlled by regulating and controlling the rolling pass and the pressing amount of each pass, and along with increase of the rolling deformation amount, in-place faults, layer faults, nano twin crystals and nano crystals are observed in a microstructure of the treated nickel-based alloy. When the rolling deformation amount exceeds 40 percent, the size of the microstructure in the treated nickel-based alloy reaches the nanometer level, the nickel-based alloy is mainly composed of the nano twin crystals and the nano crystals, dislocation and stacking faults are distributed in the nickel-based alloy, and the yield strength of the treated nickel-based alloy reaches 1000 to 1500 MPa and is 3.2 to 4.8 times of the yield strength of an untreated nickel-based alloy. The method is easy to operate, low in equipment requirement, low in cost and high in production efficiency, industrial production is easy to achieve, and the treated nickel-based alloy is of the high-strength block nanostructure.

Description

Technical field [0001] The present invention relates to the field of nanostructured metal materials, and more particularly to a nickel-based alloy of a high strength block nanostructure and a preparation method thereof. Background technique [0002] Nickel-based high-temperature alloys are extremely important high temperature structural materials, which have good high temperature strength, excellent antioxidant and corrosion resistance, and better thermal stability, which are applied to many areas including aeroengine blades. However, its intensity is relatively low, so that its anti-initial collision ability is weakened, reducing protection capabilities, which constrains its wide application. Moreover, with the rapid development of aerospace and power generation industry, new, higher requirements are proposed for the strength of nickel-based alloy materials. Optimizing its structure and improve performance has been widely concerned, in which refining grains are one of the effect...

AI Technical Summary

Problems solved by technology

Judging from the current research situation, there are mainly the following deficiencies: 1. The preparation technology or preparation process is complicated and the cost is relatively high

2. Most technologies focus on powder / surface / film samples, and the size of the samples greatly limits research and application

3. Defects such as pores are often introduced during the preparation process, which seriously reduces the material performance

4. The effect of deformation-induced grain refinement is closely related to the deformation mode and material properties. In the system of high dislocation energy metal materials (such as Ni, Fe, Al and their alloys) whose deformation mechanism is dominated by dislocation slip, due to the microscopic The stability of the structure decreases with the decrease of the structure size, and it tends to be saturated when the grains are refined to the submicron scale (100~300nm). Further increasing the strain, the grains are no longer refined, and there is a grain size limit

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