Double-phase double-lattice light high-entropy alloy and preparation method thereof

A high-entropy alloy and coherent technology, applied in the field of dual-phase dual-coherent light-weight high-entropy alloy and its preparation, can solve problems such as the incompatibility of alloy strength and plasticity, and achieve improved mechanical properties, wide application prospects, and preparation effects. Good results

Pending Publication Date: 2021-07-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a two-phase double coherent lightweight high-entropy alloy and its preparation method in order to solve the problem that the alloy strength and plasticity are not compatible

Method used

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  • Double-phase double-lattice light high-entropy alloy and preparation method thereof
  • Double-phase double-lattice light high-entropy alloy and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] Embodiment 1: by Al 40 (TiV) 40 Si 2 The atomic mole percentage of the light high-entropy alloy is batched; the prepared raw materials are placed in the crucible according to the melting point, and the elements with high melting point are at the top, and the elements with low melting point are at the bottom. The background vacuum is 1×10 -3 Pa, under the protection of argon, the high-entropy alloy block is obtained by melting; the high-entropy alloy block is placed in a high-vacuum tube furnace, and the vacuum is evacuated to 6×10 -4 Pa, and heated to a heat treatment temperature of 900 ° C, holding time of 12 hours, cooled to room temperature with the furnace, the alloy is a FCC / BCC two-phase double-precipitation coherent structure, and the theoretical density is 4.06g / cm 3 , hardness 480HV, high temperature performance 640 ℃.

Embodiment 2

[0027] Example 2: Al 40 (TiV) 40 Si 2 The atomic mole percentage of the light high-entropy alloy is batched; the prepared raw materials are placed in the crucible according to the melting point, and the elements with high melting point are at the top, and the elements with low melting point are at the bottom. The background vacuum is 1×10 -3 Pa, under the protection of argon, the high-entropy alloy block is obtained by melting; the high-entropy alloy block is placed in a high-vacuum tube furnace, and the vacuum is evacuated to 6×10 -4 Pa, and heated to a heat treatment temperature of 900°C, holding time for 12 hours, air cooled to room temperature, the alloy is a FCC / BCC two-phase double-precipitation coherent structure, and the theoretical density is 4.06g / cm 3 , hardness 490HV, high temperature performance 620 ℃.

Embodiment 3

[0028] Example 3: Al 40 (TiV) 40 Si 2 The atomic mole percentage of lightweight high-entropy alloys is used for batching; the background vacuum is 1×10 -3 Pa, under the protection of argon, the high-entropy alloy block is obtained by melting; the high-entropy alloy block is placed in a high-vacuum tube furnace, and the vacuum is evacuated to 6×10 -4 Pa, and heated to a heat treatment temperature of 900°C, holding time for 12 hours, cooled to room temperature with water, the alloy is a FCC / BCC two-phase double-precipitation coherent structure, and the theoretical density is 4.06g / cm 3 , hardness 500HV, high temperature resistance 610 ℃. Such as figure 2 As shown, the alloy has a dual-phase structure and contains nanoscale precipitated phases.

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Abstract

The invention discloses a double-phase double-lattice heterostructure light high-entropy alloy design and a preparation method thereof. The high-entropy alloy is characterized in that the high-entropy alloy is of an FCC / BCC double-phase double-lattice structure, the high-entropy alloy is marked as Ala (TiV) bMcNd according to the atomic number ratio, M is at least one of Cr, Mn, Fe, Co, Ni, Cu or Zn, and N is one or more of Si, C, B and the like. The situation that 40<=a<=60, 25<=b<=40, 0<=c<=10, 0<=d <=10, c and d are not 0 simultaneously, and a+b+c+d=100 is achieved. An alloy ingot is directly prepared through magnetic suspension induction melting, the prepared alloy has the advantages of ultrahigh strength, low density, good plasticity, high temperature resistance and wide application prospects, meanwhile, the preparation mode is simple, and the preparation effect is good.

Description

technical field [0001] The invention belongs to the field of metal materials and their preparation, and in particular relates to a dual-phase double-coherent lightweight high-entropy alloy and a preparation method thereof. Background technique [0002] High-entropy alloys are alloys composed of five or more components in approximately equal atomic ratios. Design new fields. Due to the multi-principal effect (high entropy effect, lattice distortion effect, hysteresis diffusion effect and cocktail effect), it exhibits a series of excellent properties, such as outstanding high temperature strength, good low temperature plasticity, good wear resistance, good Excellent corrosion resistance and excellent radiation resistance. With the progress of research, the scope of high-entropy alloys has been expanded, the components are no longer limited to five or more, and the atomic ratio is gradually deviating from the equiatomic ratio. The designability of the alloy is greatly improve...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C30/02C22C30/06C22C21/00C22C1/02C22F1/04C22F1/02
CPCC22C30/00C22C30/02C22C30/06C22C21/003C22C1/026C22F1/04C22F1/02
Inventor 操振华翟高阳开明杰
Owner NANJING UNIV OF TECH
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