High-entropy alloy and method for preparing high-entropy alloy block through powder metallurgy method

A high-entropy alloy and powder metallurgy technology, applied in the field of materials, can solve the problems of void product size, as-cast alloy composition segregation, coarse structure, etc., and achieve the effect of improving performance, uniform composition and uniform structure

Active Publication Date: 2018-03-23
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the existing high-entropy alloys are prepared by smelting, and the obtained as-cast alloys have disadvantages such as composition segregation, coarse structure, shrinkage porosity, voids, and product size restrictions.

Method used

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  • High-entropy alloy and method for preparing high-entropy alloy block through powder metallurgy method
  • High-entropy alloy and method for preparing high-entropy alloy block through powder metallurgy method
  • High-entropy alloy and method for preparing high-entropy alloy block through powder metallurgy method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0034] First, the ratio of alloy powder raw materials (mole fraction): 19.2% iron, 19.2% cobalt, 19.2% chromium, 19.2% nickel, 19.2% manganese, 4% nitrogen, after mixing evenly, carry out ball milling according to the ball milling design process parameters, after ball milling Alloy powder such as figure 1 , The particle shape is spherical or nearly spherical with uniform particle size, and the particle size range is 20-30 μm.

[0035] Secondly, the ball-milled high-entropy alloy powder is placed in a high-strength graphite mold for vacuum hot-press sintering. The sintering process parameters are: heating rate 8°C / min, sintering temperature 900°C, holding time 1h, constant pressure 50Mpa .

[0036] The XRD spectrum of the sintered bulk high-entropy alloy is as follows: figure 2 As shown, the microstructure morphology (SEM) is as image 3 As shown, the microhardness is 485HV, and its room temperature compressive mechanical properties are as follows Figure 4 , where the com...

no. 2 example

[0039] First, the ratio of alloy powder raw materials (mole fraction): 19.2% iron, 19.2% cobalt, 19.2% chromium, 19.2% nickel, 19.2% manganese, 4% nitrogen, after mixing evenly, carry out ball milling according to the ball milling design process parameters, after ball milling Alloy powder such as figure 1 , The particle shape is spherical or nearly spherical with uniform particle size, and the particle size range is 20-30 μm.

[0040] Secondly, the ball-milled high-entropy alloy powder was placed in a high-strength graphite mold for spark plasma sintering. The sintering process parameters were: heating rate 70°C / min, sintering temperature 900°C, holding time 10min, constant pressure 50Mpa.

[0041] Finally, cool down with the furnace.

no. 3 example

[0043] First, the ratio of alloy powder raw materials (mole fraction): 19.2% iron, 19.2% cobalt, 19.2% chromium, 19.2% nickel, 19.2% manganese, 4% nitrogen, after mixing evenly, carry out ball milling according to the ball milling design process parameters, after ball milling Alloy powder such as figure 1 , The particle shape is spherical or nearly spherical with uniform particle size, and the particle size range is 20-30 μm.

[0044] The ball-milled high-entropy alloy powder is placed in a high-strength graphite mold for vacuum hot isostatic pressing sintering. The sintering process parameters are: heating rate 8°C / min, sintering temperature 900°C, holding time 1h, constant pressure 50MPa .

[0045] Finally, cool down with the furnace.

[0046] The invention adopts a powder metallurgy method to prepare a nitrogen-containing FeCoCrNiMn high-entropy alloy, and uses the powder metallurgy method to obtain a high-entropy alloy with uniform structure and fine crystal grains, ther...

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Abstract

A powder metallurgy high-entropy alloy comprises, by atomic percentage, 5-35% of iron, 5-35% of cobalt, 5-35% of chromium, 5-35% of nickel, 5-35% of manganese and 0.1-5% of nitrogen. A preparation method of the powder metallurgy high-entropy alloy includes the steps that high-entropy alloy powder is prepared, the high-entropy alloy powder is matched, after being mixed uniformly, the high-entropy alloy powder is placed in a ball mill to be subjected to ball milling, the particle shape of the high-entropy alloy powder after being subjected to ball milling is in the shape of a sphere uniform in particle size or a similar sphere, and the particle size range is 20-30 microns; and the high-entropy alloy powder after being subjected to ball milling is placed in a high-strength graphite mold to besubjected to vacuum hot pressing sintering, and finally furnace cooling is performed. The high-entropy alloy uniform in structure and fine in grain is obtained in a powder metallurgy method, and therefore the performance of the alloy is improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of materials, and specifically refers to a high-entropy alloy and a method for preparing a high-entropy alloy block by powder metallurgy. 【Background technique】 [0002] Traditional alloys are mainly composed of one or two elements, while high-entropy alloys are composed of five or more metals as the main elements, and the mole fraction of each element is between 5% and 35%. It has a simple solid solution Phase structure, such as face-centered cubic structure (FCC) phase, body-centered cubic structure (BCC) phase. Compared with traditional alloys, high-entropy alloys have multi-principal element effects, mainly manifested as high-entropy effects in thermodynamics, slow diffusion effects in kinetics, strict lattice distortion effects in structure, and cocktail effects in performance. Through reasonable composition and process design, high-entropy alloys can exhibit superior comprehensive properties unmatch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/04B22F3/105B22F3/15
CPCB22F3/105B22F3/15B22F2003/1051B22F2998/10C22C1/04C22C30/00B22F2009/043
Inventor 戴品强谢炎崇程虎王卫国常发洪丽华田君
Owner FUJIAN UNIV OF TECH
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