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A nitrogen-strengthened tizrhfnb-based high-entropy alloy and preparation method thereof

A high-entropy alloy and alloy technology, which is applied in the field of metal materials and their preparation, achieves the effects of no work hardening, large application range of components, and convenient preparation

Active Publication Date: 2017-11-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tensile properties of BCC refractory high-entropy alloys have rarely been reported.

Method used

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  • A nitrogen-strengthened tizrhfnb-based high-entropy alloy and preparation method thereof
  • A nitrogen-strengthened tizrhfnb-based high-entropy alloy and preparation method thereof
  • A nitrogen-strengthened tizrhfnb-based high-entropy alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] The preparation process of TiZrHfNbN high entropy alloy is as follows:

[0037] (1) Raw material preparation: The alloy smelting raw materials used in the present invention are high-purity (≥99.9%) Ti, Zr, Hf and Nb elements, and the raw materials are removed by means of grinding wheels, etc., and the scale is accurately weighed and proportioned according to the molar ratio , cleaned with ultrasonic vibration in alcohol, used for co-smelting alloys, and N element is directly added in the form of powder or bulk TiN. The sources of Ti elements include high-purity Ti and TiN, and the total content of Ti elements conforms to the nominal composition.

[0038] Table 1 Nominal composition (at%) of TiZrHfNbN high-entropy alloy system

[0039] alloy

Ti

Zr

f

Nb

N

TiZrHfNb

25

25

25

25

-

(TiZrHfNb) 99.5 N 0.5

24.875

24.875

24.875

24.875

0.5

(TiZrHfNb) 99 N 1.0

24.75

24.75

24.75

24.75...

Embodiment 2

[0058] (TiZrHfNb) 94 m 5 N 1.0 Preparation and Properties of (M=Al, Ta, V)

[0059] In the alloy system provided by the present invention, the doping of other alloy elements will significantly change the mechanical properties of the alloy. Figure 7 is the XRD pattern of TiZrHfNb-based high-entropy alloys with three different alloying elements added at a nitrogen content of 1 at%. 1, 2, 3, 4 respectively correspond to (TiZrHfNb) 99 N 1.0 , (TiZrHfNb) 94 Al 5 N 1.0 , (TiZrHfNb) 94 Ta 5 N 1.0 , (TiZrHfNb) 94 V 5 N 1.0 alloy. Among them, the abscissa is the 2θ angle, and the ordinate is the diffraction intensity (arbitrary unit). Contrast (TiZrHfNb) 99 N 1.0It can be found that the addition of 5 at% Al, Ta, V did not change the single-phase BCC structure of the alloy. At the same time, we found that the addition of Al, Ta, and V significantly increased the intensity of the first diffraction peak, that is, significantly increased the intensity of the (100) diffra...

Embodiment 3

[0061] Part of the alloy composition and performance list studied by the present invention

[0062] Various ratios of nitrogen-strengthened TiZrHfNb-based high-entropy alloys were prepared according to the methods of Examples 1 and 2, and their compositions and mechanical properties are listed in Table 3.

[0063] Table 3 Part of the alloy composition, tensile yield strength σy and tensile plasticity εp studied in the present invention

[0064] Example

[0065] The innovative microalloying of N element in the TiZrHfNb-based high-entropy alloy of the present invention significantly improves the yield strength and tensile strength of the TiZrHfNb-based high-entropy alloy, and can basically maintain the plastic deformation ability in a large composition range. In particular, the yield strength of the N-2.0 alloy reaches 1272MPa, the tensile strength reaches 1283MPa, and the elongation reaches 10.7%, which has excellent comprehensive tensile properties.

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Abstract

The invention provides nitrogen-strengthened TiZrHfNb-based high-entropy alloy and a preparation method thereof. The effect of strengthening interstitial atoms is achieved through the microalloyed N element, and thus the tensile strength of the alloy is remarkably improved. The technique comprises the following steps that metal raw materials including Ti, Zr, Hf and Nb are accurately weighed according to a molar ratio after oxide skin of the metal raw materials is removed through a mechanical method, other adding elements are accurately weighed according to a molar ratio after mechanical skin removal or ultrasonic cleaning or acid pickling is conducted on the adding elements, and the element N is added in a nitride form; and the target alloy is smelted in a non-consumable vacuum electro-arc furnace or a cold crucible shower furnace, and the alloy is obtained through vacuum suction-casting or casting equipment. According to the nitrogen-strengthened TiZrHfNb-based high-entropy alloy and the preparation method thereof, by innovatively adding the element N, the tensile property of the high-entropy alloy is remarkably improved, and particularly the tensile strength of (TiZrHfNb) 98N2.0 high-entropy alloy approximates to 1300 Mpa; and meanwhile, the plastic elongation is 10% or over, and the comprehensive tensile property of the nitrogen-strengthened TiZrHfNb-based high-entropy alloy is remarkably superior to that of existing high-entropy alloy systems.

Description

technical field [0001] The invention belongs to the field of metal materials and their preparation, and in particular relates to a nitrogen-strengthened TiZrHfNb-based high-entropy alloy and a preparation method thereof. Background technique [0002] High-entropy alloys, also known as high-chaos alloys, are multi-principal alloys with 5-13 elements. Due to its high temperature thermal stability, corrosion resistance, high strength, high oxidation resistance and excellent magnetoelectric properties, etc., it has created a new field for metal materials and is an emerging material with great development potential. The alloying elements in high-entropy alloys are proportioned in equimolar or non-equiomolar ratios, and elements can also be added in small amounts to achieve the purpose of modification. The number of main components is n≥5, and the atomic percentage of each element does not exceed 35 %, the high-entropy effect of high-entropy alloys makes the intermetallic compoun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/02C22C27/00C22C28/00C22C30/00C22C1/02
Inventor 吕昭平雷智锋何骏阳黄海龙吴渊王辉刘雄军
Owner UNIV OF SCI & TECH BEIJING
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