A W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity and a density adjustment method thereof

Abstract

The present application relates to the technical field of energetic high-entropy alloys, and specifically discloses a W-Ti-Zr-Mo series energetic high-entropy alloy with excellent strength and plasticity and a density adjustment method thereof. The main elements of the energetic high-entropy alloy are W, Ti, Zr and Mo; according to the atomic percentage W:Ti:Zr:Mo=a:b:c:d; wherein, 5≤a≤20, 25≤b≤45, 25≤c≤45, 5≤d≤30, and a+b+c+d=100. The present application ensures the comprehensive performance of energetic high-entropy alloys by reasonably optimizing the matching relationship between density-energy release and strength-plasticity. By controlling the formation of a dual-phase structure of BCC and LAVES phases, the energetic high-entropy alloy obtains a good match between strength and plasticity, excellent dynamic and static mechanical properties, and outstanding energy release effect.

Description

Technical Field

[0001] The present application relates to the technical field of energetic high entropy alloys, and in particular to a W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity and a method for adjusting its density. Background Art

[0002] Energetic structural materials are high-strength reactive materials with excellent mechanical properties and energy-release damage. High-efficiency damage warheads made of energetic structural materials can release energy through additional chemical reactions on the basis of kinetic damage, causing further combustion or even explosion, thereby causing higher damage effects.

[0003] However, while the high density of energetic structural materials ensures their kinetic energy damage, it easily leads to a decrease in the energy release damage efficiency. The reduction in the plasticity of energetic structural materials under ultra-high strength also affects the integrity of the energetic structural materials at the high strain rate in the initial collision.

[0004] Therefore, it is necessary to find a new method to improve the comprehensive performance of energetic structural materials. Summary of the invention

[0005] The present application provides a W-Ti-Zr-Mo energetic high entropy alloy with excellent strength and plasticity and a density adjustment method thereof. The present application reasonably optimizes the matching relationship between density-energy release and strength-plasticity, thereby ensuring the comprehensive performance of the energetic high entropy alloy.

[0006] In the first aspect, the present application provides a W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity, using the following technical solution:

[0007] A W-Ti-Zr-Mo energetic high-entropy alloy with excellent strength and plasticity, wherein main elements of the energetic high-entropy alloy are W, Ti, Zr and Mo; according to atomic percentage, W:Ti:Zr:Mo=a:b:c:d; wherein 5≤a≤20, 25≤b≤45, 25≤c≤45, 5≤d≤30, and a+b+c+d=100.

[0008] Optionally, the range of a may be: 5≤a≤10, 5≤a≤15, 10≤a≤15, 10≤a≤20 or 15≤a≤20.

[0009] Optionally, the range of b can be: 25≤b≤30, 25≤b≤35, 25≤b≤40, 30≤b≤35, 30≤b≤40, 30≤b≤45, 35≤b≤40, 35≤b≤45 or 40≤b≤45.

[0010] Optionally, the range of c can be: 25≤c≤30, 25≤c≤35, 25≤c≤40, 30≤c≤35, 30≤c≤40, 30≤c≤45, 35≤c≤40, 35≤c≤45 or 40≤c≤45.

[0011] Optionally, the range of d can be: 5≤d≤10, 5≤d≤15, 5≤d≤20, 5≤d≤25, 10≤d≤15, 10≤d≤20, 10≤d≤25, 10≤d≤30, 15≤d≤20, 15≤d≤25, 15≤d≤30, 20≤d≤25, 20≤d≤30 or 25≤d≤30.

[0012] Optionally, 15≤(a+d)≤45, 55≤(b+c)≤85.

[0013] Optionally, the microstructure of the energetic high entropy alloy is a dual-phase structure of BCC+LAVES phase.

[0014] Optionally, the volume fraction of the LAVES phase is 15-65%.

[0015] Optionally, the energetic high entropy alloy does not break when the static compression deformation rate is within 30%.

[0016] Optionally, the static compressive strength of the energetic high entropy alloy is ≥2000MPa.

[0017] Optionally, the strain rate of the energetic high entropy alloy reaches 1000s -1 above.

[0018] Optionally, the dynamic compressive strength of the energetic high entropy alloy is ≥1800MPa.

[0019] Optionally, the compression deformation rate of the energetic high entropy alloy is ≥8%.

[0020] In the second aspect, the present application provides a density adjustment method for the W-Ti-Zr-Mo system energetic high entropy alloy having excellent strength and plasticity, using the following technical solution:

[0021] A density adjustment method for a W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity, specifically: the density of the energetic high entropy alloy is adjusted by replacing Mo and W in the main components, and the density is controlled within 7.0-9.0 g / cm 3 within the range.

[0022] Optionally, the density is controlled at 7.0-7.5 g / cm 3 , 7.0-8.0g / cm 3 , 7.0-8.5g / cm 3, 7.5-8.0g / cm 3 , 7.5-8.5g / cm 3 , 7.5-9.0g / cm 3 , 8.0-8.5g / cm 3 , 8.0-9.0g / cm 3 or 8.5-9.0g / cm 3 within the range.

[0023] Compared with the prior art, this application can at least achieve the following beneficial effects:

[0024] (1) In this application, by controlling the formation of a dual-phase structure of BCC and LAVES phases, the energetic high-entropy alloy obtains a good match between strength and plasticity, excellent dynamic and static mechanical properties, and outstanding energy release effect.

[0025] (2) In addition, the present application can appropriately regulate the density of the energetic high entropy alloy by replacing W and Mo, and the dynamic and static mechanical properties of the energetic high entropy alloy meet the requirements.

[0026] (3) This application ensures the comprehensive performance of energetic high-entropy alloys by reasonably optimizing the matching relationship between density-energy release and strength-plasticity.

[0027] (4) The energetic high entropy alloy provided in the present application has excellent static properties, with a static compressive strength of ≥2000MPa and no damage within a static compression deformation rate of 30%.

[0028] (5) The energetic high entropy alloy provided in this application has excellent dynamic properties, with a strain rate of 1000s -1 The above, dynamic compression strength ≥1800MPa, compression deformation rate ≥8%, and has significant deflagration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the stress-strain curve of the static compression of the energetic high entropy alloy of Example 1.

[0030] Figure 2 The energetic high entropy alloy of Example 1 is subjected to a strain rate of 2000s -1 The stress-strain curve below.

[0031] Figure 3 This is the microstructure picture of the energetic high entropy alloy of Example 1 under a transmission electron microscope.

[0032] Figure 4 The stress-strain curves of static compression of the energetic high entropy alloys of Examples 2-4.

[0033] Figure 5The energetic high entropy alloy of Example 2 is subjected to a strain rate of 2000s -1 The stress-strain curve below.

[0034] Figure 6 The energetic high entropy alloy of Example 3 is subjected to a strain rate of 2000s -1 The stress-strain curve below. DETAILED DESCRIPTION

[0035] Before describing the embodiments of the present application in detail, it should be understood that the terms used herein are only used for the purpose of describing specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by ordinary technicians in the field to which the terms belong.

[0036] The present application provides a W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity.

[0037] This energetic high-entropy alloy contains four main elements, namely W, Ti, Zr and Mo.

[0038] Among them, the molar fraction of element W is 5-20%, the molar fraction of element Ti is 25-45%, the molar fraction of element Zr is 25-45%, and the molar fraction of element Mo is 5-30%.

[0039] In addition, the sum of the mole fractions of W and Mo satisfies 15-45%, and the sum of the mole fractions of Ti and Zr satisfies 55-85%.

[0040] At the same time, the energetic high entropy alloy has a dual-phase structure of BCC and LAVES phase, wherein the LAVES phase is a W- and Mo-rich phase, and the volume fraction of the LAVES phase is 15-65%.

[0041] The energetic high-entropy alloy provided in the present application has excellent static properties, with a static compressive strength of ≥2000MPa and no damage within a static compression deformation rate of 30%.

[0042] The energetic high entropy alloy provided in this application has excellent dynamic properties, and the strain rate reaches 1000s -1 The above, dynamic compression strength ≥1800MPa, compression deformation rate ≥8%, and has significant deflagration effect.

[0043] The present application provides a density adjustment method for the W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity. Specifically, the density of the energetic high entropy alloy is adjusted by replacing Mo and W in the main components, and the density is controlled at 7.0-9.0 g / cm 3The proper substitution of W and Mo will not affect the main structure of energetic high entropy alloy, which is still a dual-phase structure of BCC+LAVES phase. And its dynamic / static mechanical properties still meet the requirements.

[0044] To make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0045] The present application is further described in detail below in conjunction with the embodiments and test results. Example Example 1

[0046] This embodiment provides a W-Ti-Zr-Mo system energetic high entropy alloy.

[0047] The W-Ti-Zr-Mo system energetic high entropy alloy has four main components, namely W, Ti, Zr and Mo. The content of each component and the alloy density are shown in Table 1.

[0048] The preparation method of the W-Ti-Zr-Mo energetic high entropy alloy is as follows: a vacuum induction furnace is used for smelting, and the smelting is repeated for more than 8 times, and the sample is turned over before each smelting. Each smelting must ensure that the alloy is kept in a liquid state for more than 10 minutes.

[0049] The test results of the W-Ti-Zr-Mo energetic high entropy alloy are as follows Figure 1-3 shown.

[0050] Figure 1 is the stress-strain curve of static compression, Figure 2 The strain rate is 2000s -1 The stress-strain curve below Figure 3 This is a tissue picture under transmission electron microscopy.

[0051] Embodiment 2-4

[0052] Embodiments 2-4 provide a W-Ti-Zr-Mo energetic high entropy alloy respectively. The above embodiments differ from embodiment 1 in that the content of the main components and the alloy density, and the preparation method are the same as that of embodiment 1.

[0053] The W-Ti-Zr-Mo system energetic high entropy alloy has four main components, namely W, Ti, Zr and Mo. The content of each component and the alloy density are shown in Table 1.

[0054] Table 1 Contents of main components and alloy density of energetic high entropy alloys provided in the examples

[0055]

[0056] The test results of the W-Ti-Zr-Mo energetic high entropy alloy are as follows: Figure 4-6 shown.

[0057] Figure 4 is the stress-strain curve of static compression of the energetic high entropy alloy of Example 2-4, Figure 5 The energetic high entropy alloy of Example 2 is subjected to a strain rate of 2000s -1 The stress-strain curve below Figure 6 The energetic high entropy alloy of Example 3 is subjected to a strain rate of 2000s -1 The stress-strain curve below.

[0058] Depend on Figure 1 and Figure 4 It can be seen that the static compressive strength of the energetic high entropy alloy of the present application is ≥2000MPa. Figure 2 and Figure 5-6 It can be seen that the energetic high entropy alloy of the present application is -1 The dynamic compressive strength under ≥1800MPa. Figure 3 It can be seen that the microstructure of the energetic high entropy alloy of the present application is a BCC matrix and a spherical LAVES phase.

[0059] From Table 1 and Figure 1-6 It can be seen that the present application controls the formation of a dual-phase structure of BCC and LAVES phases, and the energetic high entropy alloy obtains a good match of strength and plasticity, excellent dynamic and static mechanical properties, and excellent energy release effect. In addition, the present application can appropriately regulate the density of the energetic high entropy alloy by replacing W and Mo, and the dynamic and static mechanical properties of the energetic high entropy alloy meet the requirements.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity, characterized in that: The elements of the energetic high entropy alloy are W, Ti, Zr and Mo; according to the atomic percentage W:Ti:Zr:Mo=a:b:c:d; wherein 5≤a≤20, 25≤b≤45, 25≤c≤45, 5≤d≤30, and a+b+c+d=100; The microstructure of the energetic high entropy alloy is a dual-phase microstructure of BCC+LAVES phase; The density of the energetic high entropy alloy is controlled at 7.0-7.5 g / cm 3 within the range.

2. The W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity according to claim 1, characterized in that: 15≤(a+d)≤45, 55≤(b+c)≤85.

3. The W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity according to claim 1, characterized in that: The volume fraction of the LAVES phase is 15-65%.

4. The W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity according to claim 1, characterized in that: The energetic high entropy alloy does not break when the static compression deformation rate is within 30%.

5. The W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity according to claim 1, characterized in that: The static compressive strength of the energetic high entropy alloy is ≥2000MPa.

6. The W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity according to claim 1, characterized in that: The strain rate of the energetic high entropy alloy reaches 1000s -1 above.

7. The W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity according to claim 1, characterized in that: The energetic high entropy alloy is subjected to a strain rate of 2000 s -1 The dynamic compressive strength under the condition is ≥1800MPa.

8. The W-Ti-Zr-Mo system energetic high entropy alloy with excellent strength and plasticity according to claim 1, characterized in that: The compression deformation rate of the energetic high entropy alloy is ≥8%.

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