NiCoCr-containing medium/high-entropy alloy with non-equal atomic ratio and preparation method thereof

A high-entropy alloy, atomic ratio technology, applied in the field of atomic ratio medium/high-entropy alloy and its preparation, to achieve the effect of good strengthening effect

Active Publication Date: 2021-04-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At room temperature, the NiCoCr ternary alloy system has better plasticity than other ternary systems or even quaternary and quinary alloy systems. High-entropy alloys, there are few reports on high-performa

Method used

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  • NiCoCr-containing medium/high-entropy alloy with non-equal atomic ratio and preparation method thereof
  • NiCoCr-containing medium/high-entropy alloy with non-equal atomic ratio and preparation method thereof
  • NiCoCr-containing medium/high-entropy alloy with non-equal atomic ratio and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1: Use SiC sandpaper to remove the oxide layer on the surface of Ni, Co, and Cr metal raw materials with a purity >99.99%, then place it in an ultrasonic cleaner and clean it with alcohol, and then air dry it naturally after taking it out;

[0040] Step 2: Calculate and weigh the pure metal raw material with a total mass of (50±0.1) g according to the atomic ratio Ni:Co:Cr=3.5:3:1.5;

[0041] Step 3: Put the raw materials into the copper mold crucible of the vacuum arc melting furnace according to the order of the melting point of the metal raw materials from low to high, and the vacuum degree is at least 3×10 -3 Pass high-purity argon gas under the environment of Pa;

[0042] Step 4: First, smelt pure titanium to absorb the residual oxygen in the furnace cavity; then smelt the alloy, and keep the arc for 10 to 20 seconds when the sample is completely melted; turn it over after the alloy is cooled, and repeat this for more than 5 times to obtain Non-equiatomic rat...

Embodiment 2

[0045] Step 1: Use SiC sandpaper to remove the oxide layer on the surface of Ni, Co, Cr, and Al metal raw materials with a purity >99.99%, then place it in an ultrasonic cleaner and clean it with alcohol, and then air dry it naturally after taking it out;

[0046] Step 2: According to (Ni 3.5 co 3 Cr 1.5 ) 90 al 10 Calculate the composition and weigh out the pure metal raw material with a total mass of (50±0.1)g;

[0047] Step 3: Put the raw materials into the copper mold crucible of the vacuum arc melting furnace according to the order of the melting point of the metal raw materials from low to high, and the vacuum degree is at least 3×10 -3 Pass high-purity argon gas under the environment of Pa;

[0048] Step 4: First, smelt pure titanium to absorb the residual oxygen in the furnace cavity; then smelt the alloy, and keep the arc for 10 to 20 seconds when the sample is completely melted; turn it over after the alloy is cooled, and repeat this for more than 5 times to obt...

Embodiment 3

[0051] Step 1: Use SiC sandpaper to remove the oxide layer on the surface of Ni, Co, Cr, Al, Ti metal raw materials with a purity > 99.99%, then place it in an ultrasonic cleaner and clean it with alcohol, take it out and air dry it naturally;

[0052] Step 2: According to the composition (Ni 3.5 co 3 Cr 1.5 ) 90 al 5 Ti 5 Calculate and weigh the pure metal raw material with a total mass of (50±0.1)g;

[0053] Step 3: Put the raw materials into the copper mold crucible of the vacuum arc melting furnace according to the order of the melting point of the metal raw materials from low to high. -3 Pass high-purity argon gas under the environment of Pa;

[0054] Step 4: First, smelt pure titanium to absorb the residual oxygen in the furnace cavity; then smelt the alloy, and keep the arc for 10 to 20 seconds when the sample is completely melted; turn it over after the alloy is cooled, and repeat this for more than 5 times to obtain (Ni 3.5 co 3 Cr 1.5 ) 90 al 5 Ti 5 High...

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Abstract

The invention belongs to the field of medium/high-entropy alloys, and particularly relates to a NiCoCr-containing medium/high-entropy alloy with a non-equal atomic ratio and a preparation method of the NiCoCr-containing medium/high-entropy alloy. The medium/high-entropy alloy comprises the following components in percentage by atom: 30%-50% of Ni, 20%-40% of Co, 10%-30% of Cr and 0%-12% of M, wherein M is selected from 0-2 of Al and Ti. The preparation method comprises the following steps of: putting a high-purity metal block raw material into a water-cooled copper mold crucible of an electric arc smelting furnace according to a certain proportion, and smelting under the protection of an argon atmosphere to obtain an as-cast product. The components of the NiCoCr-containing medium/high-entropy alloy are reasonable in design; the preparation process is simple and controllable; and the obtained product is excellent in performance.

Description

technical field [0001] The invention belongs to the field of medium / high entropy alloys, in particular to a non-equatomic ratio medium / high entropy alloy containing NiCoCr and a preparation method thereof, which have excellent mechanical properties at room temperature. Background technique [0002] Medium-entropy alloys (MEAs) or high-entropy alloys (High-entropy alloys, HEAs), as structural materials with great potential in the future, require alloys with good strength and toughness in engineering applications. In many high-entropy alloy systems that pursue both strength and toughness, by adding alloying elements Al and Ti, precipitation in the high-plastic medium / high-entropy alloy matrix or directly introducing second-phase particles can greatly increase the strength. The plasticity is retained to a greater extent on the basis. The matrix composition of this type of precipitation-strengthened high-entropy alloy is generally a single-phase face-centered cubic (FCC) struct...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22B9/20C22C1/02C22C19/05
CPCC22C30/00C22C19/05C22C1/02C22B9/20
Inventor 李松黄学玲黄兰萍
Owner CENT SOUTH UNIV
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