TiZrHfNb based high-entropy alloy with nitrogen and oxygen alloyed together and preparation method thereof

A nitrogen-oxygen co-alloy and high-entropy alloy technology, which is applied in the design of metal materials and its preparation, can solve problems such as insufficient strength and tensile properties of refractory high-entropy alloys, and achieve convenient preparation, wide composition range, and high strength. Effect

Active Publication Date: 2016-06-15
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] There are many high-entropy alloys currently developed, and the most widely used is FeCoNiCrMn high-entropy alloy. The tensile plasticity of this alloy can reach 60%, but the general strength is less than 500MPa.
However, the tensile properties of BCC refractory high-entropy alloys have rarely been reported.

Method used

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  • TiZrHfNb based high-entropy alloy with nitrogen and oxygen alloyed together and preparation method thereof
  • TiZrHfNb based high-entropy alloy with nitrogen and oxygen alloyed together and preparation method thereof
  • TiZrHfNb based high-entropy alloy with nitrogen and oxygen alloyed together and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (TiZrHfNb) 100-x (NO) x Preparation and properties of high-entropy alloys

[0035] 1. Composition design and preparation of multi-principal refractory high-entropy alloys

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

[0037] (1) Raw material preparation: The smelting raw materials used in the present invention are high-purity (≥99.9%) Ti, Zr, Hf and Nb elements, remove the scale on the surface of the raw materials, weigh and proportion according to the molar ratio, and use ultrasonic waves in alcohol Oscillation and cleaning are used for smelting alloys. N element is directly added in the form of powder or bulk TiN, and O element is added in the form of powder or bulk TiO 2 form to join directly. Sources of Ti elements include high-purity Ti, TiN and TiO 2 , the total content of Ti element conforms to the nominal composition.

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

[0039]

...

Embodiment 2

[0058] (TiZrHfNb) 94 m 5 (NO) 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 6 It is the XRD pattern of the TiZrHfNb-based high-entropy alloy with three different alloying elements added when the nitrogen and oxygen content is 1 at%. 1, 2, 3, 4 respectively correspond to (TiZrHfNb) 99 (NO) 1.0 , (TiZrHfNb) 94 al 5 (NO) 1.0 , (TiZrHfNb) 94 Ta 5 (NO) 1.0 , (TiZrHfNb) 94 V 5 (NO) 1.0 alloy. Among them, the abscissa is the 2θ angle, and the ordinate is the diffraction intensity (arbitrary unit). Contrast (TiZrHfNb) 99 (NO) 1.0According to the XRD pattern of the alloy, it 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 di...

Embodiment 3

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

[0062] According to the method of Example 1 and Example 2, TiZrHfNb-based high-entropy alloys with various ratios of nitrogen and oxygen co-alloying were prepared, and their composition and mechanical property parameters are listed in Table 3.

[0063] Table 3 Part of the alloy composition and tensile yield strength σ studied in the present invention y and tensile plastic ε p

[0064] Example Alloy composition (at %) σ y (MPa) ε p (MPa) 1 (TiZrHfNb) 99.5 (NO) 0.5 882 20.4 2 (TiZrHfNb) 99 (NO) 1.0 1009 19.6 3 (TiZrHfNb) 98.5 (NO) 1.5 1111 17.0 4 (TiZrHfNb) 98 (NO) 2.0 1204 17.2 5 (TiZrHfNb) 97.5 (NO) 2.5 1298 18.1 6 Ti 20 Zr 24 Hf 26 Nb 28.5 N 0.5 o 1.0 1100 17.8 7 Ti 35 Zr 15 f 20 Nb 28 N 0.5 o 1.5 1160 18.5 8 (TiZrHfNb) 94.5 N 0.5 o 5.0 - - 9 (TiZrHfNb) 94...

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Abstract

The invention relates to TiZrHfNb based high-entropy alloy with nitrogen and oxygen alloyed together and a preparation method thereof. Particularly, the tensile strength and tensile ductility of the alloy are remarkably improved by simultaneously microalloying N and O elements. The preparation method includes the following steps that metal raw materials of Ti, Zr, Hf and Nb are accurately weighed according to the molar ratios after oxide skin is removed; other added elements are accurately weighed according to the molar ratios after oxide skin is removed and the elements are washed with alcohol; the N element is added in the form of nitride, and the O element is added in the form of oxide; and target alloy is smelted in a nonconsumable vacuum arc furnace or cold crucible shower furnace, and the alloy is obtained through vacuum suction casting or casting equipment. The tensile property of the high-entropy alloy is improved remarkably by simultaneously adding the N and O elements, the tensile strength of (TiZrHfNb)97.5(NO)2.5 based high-entropy alloy reaches 1300 MPa, meanwhile, the tensile ductility exceeds 15%, the work-hardening rate is low, and the comprehensive tensile property is excellent.

Description

technical field [0001] The invention belongs to the field of design metal materials and their preparation, and provides a nitrogen-oxygen co-alloyed TiZrHfNb-based high-entropy alloy and a preparation method thereof. Background technique [0002] As a brand-new alloy design concept, high-entropy alloy is completely different from traditional metal materials, and many phenomena different from traditional alloys are bred in this new alloy design concept. These new phenomena mainly include four effects of high entropy alloys: (1) High mixing entropy effect. When the mixing entropy of the equimolar ratio alloy of the high-entropy alloy is high enough to offset the effect of the mixing enthalpy, it will be beneficial to the formation of a solid solution. This shows that high mixing entropy can promote the mutual solubility between alloy elements, and the ordering of the alloy system will also be well suppressed, which can well avoid the phase separation of the liquid alloy durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
Inventor 吕昭平雷智锋吴渊王辉刘雄军惠希东何骏阳黄海龙
Owner UNIV OF SCI & TECH BEIJING
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