A kind of high-strength bulk nanostructure nickel-based alloy and its preparation method

Abstract

The invention provides a high-strength block nano-structured nickel-based alloy and a preparation method thereof, and relates to the technical field of nano-structured metal materials. In the present invention, the low-stacking-fault-energy face-centered cubic nickel-based alloy is rolled pass by pass by using a traditional twin-roll mill, and the rolling deformation is precisely controlled by regulating the rolling pass and each pass's downforce. As the amount increases, dislocations, stacking faults, nanotwins and nanocrystals are observed in the microstructure of the treated nickel-based alloys. When the rolling deformation exceeds 40%, the microstructure size of the treated nickel-based alloy reaches the nanometer level, mainly nano-twins or nanocrystals, and it is full of dislocations and stacking faults. The yield strength of the alloy reaches 1000~1500MPa, which is 3.2~4.8 times that of the untreated nickel-based alloy. The method is simple in operation, low in equipment requirements, low in cost, high in production efficiency, easy to realize industrial production, and the processed nickel-based alloy is a high-strength block nanostructure.

Description

technical field [0001] The invention relates to the technical field of nanostructured metal materials, in particular to a high-strength block nanostructured nickel-based alloy and a preparation method thereof. Background technique [0002] Nickel-based superalloy is an extremely important high-temperature structural material. The alloy has good high-temperature strength, excellent oxidation and corrosion resistance, and good thermal stability. It is used in many fields including aeroengine blades. However, its strength is relatively low, which weakens its ability to resist the first collision, reduces its protection ability, and restricts its wide application. Moreover, with the rapid development of the aerospace and power generation industries, new and higher requirements are placed on the strength of nickel-based alloy materials. Optimizing its structure to improve performance has received extensive attention, and refining grains is one of the effective ways to improve pe...

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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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