A kind of non-equiatomic ratio medium/high entropy alloy containing nicocr 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: 2022-05-17
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-performance non-isoatomic NiCoCr ternary medium-entropy alloys or non-isoatomic NiCoCr-based high-entropy alloys, so the current high-performance non-isoatomic NiCoCr-based medium / high entropy Alloys to be developed

Method used

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  • A kind of non-equiatomic ratio medium/high entropy alloy containing nicocr and preparation method thereof
  • A kind of non-equiatomic ratio medium/high entropy alloy containing nicocr and preparation method thereof
  • A kind of non-equiatomic ratio medium/high entropy alloy containing nicocr and preparation method thereof

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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 ob...

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 in particular relates to a NiCoCr-containing medium / high-entropy alloy with non-equiatomic ratio and a preparation method thereof. The composition of the medium / high entropy alloy includes Ni, Co, Cr, M, and the atomic percentages of each element in the medium / high entropy alloy are respectively: 30%-50% for Ni, 20%-40% for Co, and 10% for Cr ~30%, M is 0%~12%; M is selected from 0~2 of Al and Ti. The preparation method is as follows: put high-purity metal block raw materials in a certain proportion into a water-cooled copper mold crucible of an electric arc melting furnace, and melt under the protection of an argon atmosphere to obtain a cast product. The invention has reasonable component design, simple and controllable preparation process, and the obtained product has excellent 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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Patent Type & Authority Patents(China)
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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