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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  • 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, mediu

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

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0028] The preparation method includes the following steps:

[0029] 1) Place the Co, Ni, Fe, Al and Ti particles / blocks in a vacuum arc furnace according to the proportions, and vacuum 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, it is continuously turned over at least 5 times, smelted into an ingot, and the as-cast alloy ingot is homogenized and annealed.

[0030] 2) Forging the as-cast alloy ingot after homogenization annealing, and performing homogenization annealing on the forged alloy ingot.

[0031] 3) The forged alloy block is heated to 800-1000°C for rolling, and the rolled alloy block is subjected to annealing heat treatment.

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

[0033] The melting in step 1) is vacuum arc melting, and the melting current ranges from 100 to 300A.

[0034] Step 1) The homogenization annealing temperature is ...

Example Embodiment

[0039] Example 1

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

[0041] The preparation method of the Al and Ti microalloyed high-strength and toughness mid-entropy alloy is 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 a vacuum arc melting furnace, and evacuate to 1×10 -3 Pa, the protective gas is argon, the pressure in the furnace is 0.05 MPa, and the smelting is repeated 5 times to form an ingot. The as-cast alloy ingots are homogenized annealed at 1000℃, kept for 12h, and cooled in air.

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

[0044] First, place the forged alloy ingot in a muffle furnace and heat it to 900°C, then place the as-cast alloy ingot on the platform, and use a 40kg forging machine to perform multiple f...

Example Embodiment

[0047] Example 2

[0048] The composition of an Al and Ti microalloyed high-strength and toughness mid-entropy alloy of the present invention is (CoNiFe) 95 Al 3 Ti 2 .

[0049] The preparation method of the Al and Ti microalloyed high-strength and toughness mid-entropy alloy is 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 a vacuum arc melting furnace, and evacuate to 1×10 -3 Pa, the protective gas is argon, the pressure in the furnace is 0.05 MPa, and the smelting is repeated 5 times to form an ingot. The as-cast alloy ingot is homogenized annealed at 1000℃, kept for 12h, and cooled in air.

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

[0052] First, place the forged alloy ingot in a muffle furnace and heat it to 900°C, then place the as-cast alloy ingot on the platform, and use a 40kg forging machine to perform multiple forg...

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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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