Ti-rich high-entropy alloy with high specific strength, high plasticity and high toughness and preparation of Ti-rich high-entropy alloy

A technology of high-entropy alloy and high specific strength, which is applied in the field of Ti-rich high-entropy alloy and its preparation, which can solve the problems of difficult combination, achieve good corrosion resistance, ensure the uniformity of composition and structure, and the effect of uniform composition

Active Publication Date: 2021-11-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is aimed at the above technical deficiencies, and selects Ti with a low melting point in the Ti-Zr phase diagram. 2 Zr alloy, drawing on the design concept of high-entropy alloys, introducing body-centered cubic structure (bcc) phase stable elements Nb and V, and alloying elements such as Al with strong solid solution strengthening effect, developed a low melting point and high specific strength. , high plasticity and high toughness, single bcc phase Ti-rich high-entropy alloy, breaking through the difficult problem of "strong plasticity" / "toughness" of high-entropy alloy

Method used

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  • Ti-rich high-entropy alloy with high specific strength, high plasticity and high toughness and preparation of Ti-rich high-entropy alloy
  • Ti-rich high-entropy alloy with high specific strength, high plasticity and high toughness and preparation of Ti-rich high-entropy alloy
  • Ti-rich high-entropy alloy with high specific strength, high plasticity and high toughness and preparation of Ti-rich high-entropy alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A Ti with high specific strength, high plasticity and high toughness 46 Zr 23 Nb 16 V 15 The preparation of high entropy alloys, the specific steps are as follows:

[0043] Step (1): According to the alloy composition, convert the atomic percentage into mass percentage Ti:Zr:Nb:V=34:32:23:11 and weigh the ingredients; the raw materials used are all industrial-grade pure particles, and the particle size range is 1~3mm, clean and dry the weighed raw material particles, put them into a three-dimensional mixer, and put a certain quality of steel balls at the same time (the mass ratio of raw materials to steel balls is 1:1~3, and the diameter of steel balls is 15 ~30mm), so as to obtain a homogeneous mixture of raw materials.

[0044] Step (2): The obtained raw material mixture is compacted into a block by a press, and a raw material block with a relatively uniform composition is preliminarily obtained, and the maximum pressure of the raw material block is 500 MPa.

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Embodiment 2

[0048] The difference from Example 1 is that the alloy composition in this example is Ti 44 Zr 22 Nb 15 V 15 Al 4 .

[0049] see figure 2 It can be seen that the as-cast Ti of the embodiment of the present invention 44 Zr 22 Nb 15 V 15 Al 4 The high-entropy alloy structure is a typical cast dendrite structure, but the dendrite and interdendritic elements are not obvious, and it is more inclined to the near equiaxed crystal structure. see Figure 5 The XRD collection of illustrative plates can find out that the as-cast state Ti of the embodiment of the present invention 44 Zr 22 Nb 15 V 15 Al 4 High-entropy alloys have a single BCC crystal structure at room temperature. See Table 1 and Figure 6 It can be seen from the room temperature tensile test results that the alloy density is 5.765g / cm 3 , the yield strength is 897MPa, and the elongation at break exceeds 20%.

Embodiment 3

[0051] The difference from Example 1 is that the alloy composition in this example is Ti 44 Zr 22 Nb 14 V 13 Al 7 .

[0052] see image 3 It can be seen that the as-cast Ti of the embodiment of the present invention 44 Zr 22 Nb 14 V 13 Al 7 The high-entropy alloy structure is a typical cast dendrite structure, but the dendrite and interdendritic elements are not obvious, and it is more inclined to the near equiaxed crystal structure. see Figure 5 The XRD collection of illustrative plates can find out that the as-cast state Ti of the embodiment of the present invention 44 Zr 22 Nb 14 V 13 Al 7 High-entropy alloys have a single BCC crystal structure at room temperature. See Table 1 and Figure 6 It can be seen from the room temperature tensile test results that the alloy density is 5.674g / cm 3 , the yield strength of the alloy is 1041MPa, and the elongation at break is also maintained at 10% to 18%.

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Abstract

The invention relates to a Ti-rich high-entropy alloy with high specific strength, high plasticity and high toughness and a preparation method of the Ti-rich high-entropy alloy. The atomic percent expression of the high-entropy alloy is TiaZrbNbcVdAle, wherein a is greater than or equal to 42 and smaller than or equal to 46, b is greater than or equal to 21 and smaller than or equal to 23, c is greater than 13 and smaller than or equal to 16, d is greater than or equal to 13 and smaller than or equal to 15, e is greater than or equal to 0 and smaller than or equal to 10, a / b is equal to 2, and a + b + c + d + e is equal to 100. A single-BCC-phase high-entropy alloy is obtained by regulating and controlling the alloy components and the preparation process. Compared with a traditional metal material, the alloy has the advantages of being high in specific strength, excellent in tensile plasticity, high in impact toughness and the like, and the problem that the traditional metal material or high-entropy alloy is difficult to have high strength, high plasticity and high toughness at the same time is solved. The Ti-rich high-entropy alloy has a relatively low melting point by limiting the component ratio of Ti to Zr, can be used for preparing alloy ingots of tonnage or above by adopting a conventional smelting method, is easy to form and simple in preparation process and facilitates implementation of industrial application. The alloy contains Zr, Nb and other elements, and has good corrosion resistance. The alloy has wide application prospects in the fields of ocean, aerospace and the like.

Description

technical field [0001] The invention belongs to the field of metal materials and their preparation, in particular to a Ti-rich high-entropy alloy with high specific strength, high plasticity and high toughness and a preparation method thereof. Background technique [0002] Under the current "carbon reduction" goal, the development of high-performance metal structural materials has become an urgent need. The research on traditional alloys, especially alloys for structural applications, has been relatively mature in its technical research. Typically, such alloys contain one base element that dominates the chemical composition, accounting for 80% (by weight) or more of the total composition. This limited range of alloying strategies stems primarily from the fact that ternary or higher-order intermetallics unexpectedly form in multicomponent alloys after long-term exposure to higher operating temperatures. The formation of these complex intermetallic compounds usually seriousl...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/00
CPCC22C30/00C22C1/02C22F1/00Y02P10/25
Inventor 朱正旺曾帅张海峰张宏伟付华萌李宏王爱民张龙李正坤李伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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