Ultrahigh-strength and ultrahigh-toughness high-density high-entropy alloy and preparation method thereof

A high-entropy alloy and high-density technology, applied in the field of alloys, can solve the problems of insufficient performance of high-strength, toughness and high-density alloy materials, refinement of alloy microstructure, and difficulty in thermal deformation, etc., to achieve strong toughness, improve alloy strength, and improve Effects of Stability and Strengthening Capabilities

Active Publication Date: 2021-11-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the various high-density and high-strength alloy materials that have been reported so far, their thermal deformation is still limited, which cannot fundamentally solve the problems of alloy microstructure refinement and performance improvement.
[0004] The existing high-strength toughness and high-density alloy materials still have technical problems such as insufficient performance, difficulty in thermal deformation, and easy forging and cracking.

Method used

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  • Ultrahigh-strength and ultrahigh-toughness high-density high-entropy alloy and preparation method thereof

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preparation example Construction

[0048] The application also provides a method for preparing the ultrahigh-strength toughness high-density high-entropy alloy, including:

[0049] The raw material of the ultra-high-strength toughness high-density high-entropy alloy is smelted to obtain an ingot, and then homogenization treatment, forging and heat treatment are sequentially performed.

[0050] Preferably, the melting temperature is 1550-2000°C.

[0051] The smelting process mentioned above means that the master alloy ingot is first smelted by vacuum induction smelting, vacuum induction smelting+vacuum consumable smelting, cold crucible vacuum electromagnetic levitation smelting or other smelting methods that can meet the smelting temperature requirements.

[0052] Optionally, the melting temperature can be 1550°C, 1600°C, 1650°C, 1700°C, 1750°C, 1800°C, 1850°C, 1900°C, 1950°C, 2000°C or any one between 1550-2000°C value.

[0053] Preferably, the homogenization treatment includes: keeping the ingot at 1150° C....

Embodiment 1

[0070] (1) Smelting and casting: using pure metal elements of tungsten, molybdenum, cobalt, niobium, nickel, and tantalum, and master alloys composed of two or more of the above elements as raw materials, according to the requirements of tungsten, molybdenum, and cobalt , niobium, nickel, and tantalum alloy elements mixed in proportion (the mass fractions of tungsten, molybdenum, cobalt, niobium, nickel, and tantalum are: 37.13wt%, 19.37wt%, 11.90wt%, 18.76wt%, 11.85wt%, 1.00wt% %), melted in a vacuum induction furnace and cast into ingots at a melting temperature of 1600°C.

[0071] (2) Homogenization treatment: heat the ingot obtained from the above smelting at 1150°C for 20 hours to make the various refractory elements contained in the alloy diffuse evenly.

[0072] (3) Forging: Firstly, the ingot after the above homogenization treatment is billeted into a cuboid forging billet with a square cross section. %. Then, the reverse forging process is used to thicken and elonga...

Embodiment 2

[0077] (1) Smelting and casting: use pure metal elements such as tungsten, molybdenum, cobalt, niobium, nickel, palladium, tantalum, and hafnium, and master alloys composed of two or more of the above elements as raw materials. , molybdenum, cobalt, niobium, nickel, palladium, tantalum, and hafnium alloy elements are mixed in proportion (the mass fractions of tungsten, molybdenum, cobalt, niobium, nickel, palladium, tantalum, and hafnium are: 36.36wt%, 19.92wt%, 11.66wt% %, 17.46wt%, 11.61wt%, 1.00wt%, 1.00wt%, 1.00wt%) were melted and cast into ingots in a vacuum induction furnace at a melting temperature of 1650°C.

[0078] (2) Homogenization treatment: heat the ingot obtained by the above-mentioned smelting at 1150°C for 10 hours to make the various refractory elements contained in the alloy diffuse evenly.

[0079] (3) Forging: Firstly, the ingot after the above homogenization treatment is billeted into a cuboid forging billet with a square cross section. %. Then, the reve...

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Abstract

The invention provides an ultrahigh-strength and ultrahigh-toughness high-density high-entropy alloy and a preparation method thereof. The ultrahigh-strength and ultrahigh-toughness high-density high-entropy alloy comprises main alloy elements and trace alloy elements; the main alloy elements comprise essential elements and adjustable elements, the essential elements comprise tungsten, molybdenum and nickel, and the adjustable elements comprise cobalt and/or niobium; and the trace alloy elements comprise one or more of palladium, tantalum and hafnium. The preparation method of the ultrahigh-strength and ultrahigh-toughness high-density high-entropy alloy comprises the steps that raw materials are smelted to obtain a cast ingot, and then homogenization treatment, forging and heat treatment are sequentially conducted. According to the ultrahigh-strength and ultrahigh-toughness high-density high-entropy alloy, the adoption of elements such as nickel and cobalt as a binary alloy matrix in the prior art is broken through, a high-density mono-stable face-centered cubic high-entropy alloy phase is constructed by adopting various high-density elements and strengthening elements, the stability and strengthening capacity of a solid solution are greatly improved by utilizing the high-entropy effect and the cocktail effect, and the deformability of the alloy is improved.

Description

technical field [0001] The present application relates to the field of alloys, in particular to an ultrahigh-strength toughness high-density high-entropy alloy and a preparation method thereof. Background technique [0002] High-density, high-strength and toughness alloys have very important uses in various military and civilian industries such as petroleum exploration, weaponry, large-scale machinery, energy electronics, etc. due to their unique comprehensive properties. The optimization of their composition design and the development of preparation technology have always been basic science It is one of the research frontiers and hot issues of applied technology. Due to the extremely high melting point and low plasticity of this type of alloy, it is very difficult to melt and thermoform it. In the past few decades, such alloys have been prepared and formed by powder metallurgy, which has technical problems such as long process flow, difficult forming, difficulty in mass pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22F1/00B21J5/00C22C1/02
Inventor 解国良杨树峰赵朋
Owner UNIV OF SCI & TECH BEIJING
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