Al and Ti microalloyed high-strength, high-toughness and medium-entropy alloy and preparation method thereof

A technology of micro-alloying and entropy alloying, which is applied in the field of material processing, can solve the problems of less influence of plastic deformation on the structure and properties of medium-entropy alloys, poor mechanical properties of the workpiece, and high hardness, so as to improve the structure and performance, and improve the strength and toughness , the effect of excellent comprehensive performance

Inactive Publication Date: 2020-07-14
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical properties of the workpiece prepared by rolling are relatively poor, and the hardness is too high, so it must be annealed to restore its mechanical properties
[0006] As a new alloy system, medium-entropy alloys have not received widespread attention, and there are relatively few reports on the influence of corresponding plastic deformation on the microstructure and properties of medium-entropy alloys.

Method used

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  • Al and Ti microalloyed high-strength, high-toughness and medium-entropy alloy and preparation method thereof
  • Al and Ti microalloyed high-strength, high-toughness and medium-entropy alloy and preparation method thereof
  • Al and Ti microalloyed high-strength, high-toughness and medium-entropy alloy and preparation method thereof

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preparation example Construction

[0028] The preparation method comprises the following steps:

[0029] 1) Put Co, Ni, Fe, Al and Ti pellets / blocks in a proportioned proportion and place them in a vacuum electric arc furnace, and evacuate to 1×10 -2 ~1×10 -3 Pa, the protective gas is argon, and the pressure in the furnace is 0.05-0.06MPa. During the smelting process, the ingot is continuously turned over at least 5 times to be smelted into an ingot, and the as-cast alloy ingot is homogenized and annealed.

[0030] 2) Forging the cast alloy ingot after homogenizing annealing, and performing homogenizing annealing on the forged alloy block.

[0031] 3) Heating the forged alloy block to 800-1000° C. for rolling, and performing annealing heat treatment on the rolled alloy block.

[0032] The purity of the Co, Ni, Fe, Al and Ti particles / blocks described in step 1) is all 99.97wt.%.

[0033] The smelting described in step 1) is vacuum arc smelting, and the range of smelting current is 100-300A.

[0034] The ho...

Embodiment 1

[0040] The composition of the Al and Ti microalloyed high strength and toughness medium entropy alloy of the present invention is (CoNiFe) 95 Al 4 Ti 1 .

[0041] The steps of the preparation method of the above-mentioned Al and Ti microalloyed high-strength and toughness medium-entropy alloy are as follows:

[0042] 1) Put 16.52g of Co ingot, 16.45g of Ni ingot, 15.65g of Fe ingot, 0.96g of Al ingot and 0.42g of Ti ingot into the vacuum arc melting furnace, and evacuate to 1×10 -3 Pa, the protective gas is argon, the pressure in the furnace is 0.05MPa, and the ingot is smelted by repeated turning and melting 5 times. The as-cast alloy ingot was homogenized annealed at 1000°C, kept for 12 hours, and air-cooled.

[0043]2) Forging the alloy ingot after homogenization annealing, and performing homogenization annealing on the forged alloy block.

[0044] First, place the forged alloy ingot in a muffle furnace and heat it to 900°C, then place the cast alloy ingot on the platf...

Embodiment 2

[0048] A kind of Al and Ti microalloying high strength and toughness medium entropy alloy composition of the present invention is (CoNiFe) 95 Al 3 Ti 2 .

[0049] The steps of the preparation method of the above-mentioned Al and Ti microalloyed high-strength and toughness medium-entropy alloy are as follows:

[0050] 1) Put 16.46g of Co ingot, 16.39g of Ni ingot, 15.60g of Fe ingot, 0.71g of Al ingot and 0.84g of Ti ingot into the vacuum arc melting furnace, and evacuate to 1×10 -3 Pa, the protective gas is argon, the pressure in the furnace is 0.05MPa, and the ingot is smelted by repeated turning and melting 5 times. The as-cast alloy ingot was homogenized annealed at 1000°C, kept for 12 hours, and air-cooled.

[0051] 2) Forging the alloy ingot after homogenization annealing, and performing homogenization annealing on the forged alloy block.

[0052] First, place the forged alloy ingot in a muffle furnace and heat it to 900°C, then place the cast alloy ingot on the plat...

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Abstract

The invention discloses an Al and Ti microalloyed high-strength and high-toughness medium-entropy alloy and a preparation method thereof. The alloy comprises (CoNiFe) 95Al5-xTix, wherein Co, Ni and Feare proportioned according to equal atoms, and a value range of x is 1-4. A preparation process route of the alloy comprises the steps of vacuum arc melting, homogenizing annealing, forging (hot forging), homogenizing annealing, rolling (cold rolling) and annealing heat treatment. The preparation method comprises the following steps of firstly, proportioning Co, Ni, Fe, Al and Ti particles / blocksaccording to a ratio, smelting the particles / blocks into ingots by adopting a vacuum arc melting method, and carrying out homogenizing annealing; secondly, after the cast ingots are heated to a certain temperature, carrying out forging forming, and then carrying out homogenizing annealing; and finally, preparing the forged alloy into a plate with the thickness of 1-1.5 mm through rolling (cold rolling), and performing annealing heat treatment at the temperature of 600-1000 DEG C. Through reasonable plastic processing and annealing heat treatment processes, the strength and toughness of the alloy can be improved, and the medium-entropy alloy with excellent comprehensive performance can be prepared.

Description

technical field [0001] The invention relates to an Al and Ti microalloyed high-strength and tough medium-entropy alloy and a preparation method thereof, belonging to the technical field of material processing. Background technique [0002] The new alloy design concept proposes that alloys with 5 or more elements, and the atomic percentage of each element is between 5% and 35% are high-entropy alloys, that is, multi-principal alloys. In addition, high-entropy alloys can also be defined from the entropy value. In thermodynamics, entropy is a parameter that characterizes the disorder of a system. The greater the degree of chaos, the greater the entropy of the system. Alloy materials can be divided into the following three categories: low-entropy alloys, that is, traditional alloys, with one or two elements as the main constituent elements (ΔS mix ≤0.69R); medium-entropy alloys containing two to four main elements (0.69R≤ΔS mix ≤1.61R); high-entropy alloys containing at leas...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/10
CPCC22C1/02C22C19/07C22C30/00C22F1/10
Inventor 储成林赵慧安旭龙
Owner SOUTHEAST UNIV
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