FeSiBAlNiCo block high-entropy alloy and preparation method thereof

A high-entropy alloy high-volume technology, applied in the field of FeSiBAlNiCo bulk high-entropy alloys and its preparation, can solve the problems of looseness, complex process, and difficult control of the structure and properties of high-entropy alloy materials, and achieve outstanding corrosion resistance. little effect

Active Publication Date: 2016-08-17
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-entropy alloy material prepared by vacuum arc melting is a cast product, and usually has many defects, such as voids, porosity, etc., and the process of this method is relatively complicated, and the structure and properties of the obtained high-entropy alloy material are not easy to control

Method used

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  • FeSiBAlNiCo block high-entropy alloy and preparation method thereof
  • FeSiBAlNiCo block high-entropy alloy and preparation method thereof
  • FeSiBAlNiCo block high-entropy alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Preparation of high-entropy alloy powder: Take Fe, Si, B, Al, Ni, Co metal powders at a molar ratio of 1:1:1:1:1:0.2, and the purity of the powders is above 99.7%. Put the powder in a stainless steel ball mill tank, use 304 stainless steel balls as the ball mill medium, evacuate the ball mill tank, fill it with argon, and then perform mechanical alloying for 140 hours at a speed of 350 rpm and a ball-to-material ratio of 15:1. Get FeSiBAlNiCo 0.2 High entropy alloy powder. The morphology of the high-entropy alloy powder obtained after ball milling for 140 h is as follows figure 1 shown. From figure 1 It can be seen that the obtained high-entropy alloy powders are nearly spherical particles, and most of the particle sizes are below 2 μm.

[0040] Spark plasma sintering: FeSiBAlNiCo after mechanical alloying for 140 hours 0.2 The high-entropy alloy powder was packed in a cylindrical graphite mold with a diameter of 15 mm, placed in a spark plasma sintering furnace un...

Embodiment 2

[0046] Preparation of high-entropy alloy powder: Take Fe, Si, B, Al, Ni, and Co powders at a molar ratio of 1:1:1:1:1:0.8, and the purity of the powders is above 99.7%. Put the powder in a stainless steel ball mill tank, use 304 stainless steel balls as the ball mill medium, evacuate the ball mill tank, fill it with argon, and then perform mechanical alloying for 140 hours at a speed of 350 rpm and a ball-to-material ratio of 15:1. Get FeSiBAlNiCo 0.8 High-entropy alloy powder, its morphology is as follows Figure 6 shown. It can be seen from the figure that the obtained high-entropy alloy powder is a spherical particle with a particle size below 3 μm.

[0047] Spark plasma sintering: FeSiBAlNiCo after mechanical alloying for 140 hours 0.8 The high-entropy alloy powder is packed in a cylindrical graphite mold with a diameter of 15 mm, placed in a spark plasma sintering furnace under the protection of an argon atmosphere, heated to 850 °C, pressurized to 90 MPa, and kept for...

Embodiment 3

[0053] Preparation of high-entropy alloy powder: Take Fe, Si, B, Al, Ni, Co metal powders in equimolar ratios, and the purity of the metal powders is above 99.7% (the stated % is a mass percentage; the same below). Put the powder in a stainless steel ball mill tank, use 304 stainless steel as the ball mill medium, evacuate the ball mill tank, fill it with argon, and then perform mechanical alloying for 140 hours at a speed of 350 rpm and a ball-to-material ratio of 15:1 , to obtain FeSiBAlNiCo high-entropy alloy powder. The morphology of the FeSiBAlNiCo high-entropy alloy powder obtained by ball milling for 140 h is as follows Figure 11 shown. It can be seen from the figure that the obtained high-entropy alloy powder is a nearly spherical particle with a particle size below 2 μm.

[0054] Spark plasma sintering: Put the FeSiBAlNiCo high-entropy alloy powder after mechanical alloying for 140 hours into a cylindrical graphite mold with a diameter of 15mm, put it in a spark pl...

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Abstract

The invention relates to FeSiBAlNiCo block high-entropy alloy and a preparation method thereof and belongs to the technical field of powder metallurgy. According to the FeSiBAlNiCo block high-entropy alloy, the molar ratio of Fe to Si to B to Al to Ni to Co is 1: 1: 1: 1: 1: (0-1); the crystal structure comprises a face-centered cubic (FCC), a body-centered cubic (BCC) and two-phase intermetallic compounds, namely FeSi and FeB. According to the FeSiBAlNiCo block high-entropy alloy and the preparation method thereof, the Co element of a medium size is added to the Fe-Si-B-Al-Ni quinary alloy, a spark plasma sintering technology is utilized, and the block high-entropy alloy with the diameter being 15 mm is prepared. The density of the high-entropy alloy reaches 96.5% or above, the hardness value reaches 1100 HV or above, prominent NaCl solution corrosion resistance is achieved, and special requirements of certain adverse environments can be met. The block high-entropy alloy is prepared through a powder metallurgic method, and the process is relatively simple; a prepared product has the advantages that few defects exist, and performance is excellent.

Description

technical field [0001] The invention relates to a FeSiBAlNiCo bulk high-entropy alloy and a preparation method thereof, belonging to the technical field of powder metallurgy. Background technique [0002] High-entropy alloy is a new type of alloy first proposed by Taiwanese scholar Ye Junwei. High-entropy alloys are different from traditional alloys. High-entropy alloys are composed of five or more elements in an equiatomic ratio or close to an equiatomic ratio, and tend to form a simple phase structure of body-centered cubic (BCC) or face-centered cubic (FCC). ) solid solution or amorphous structure, in addition, a small amount of high-entropy alloys form solid solutions of hexagonal close-packed structure (HCP). Compared with traditional alloys, high-entropy alloys have high-entropy effects, lattice distortion effects, hysteretic diffusion effects, cocktail effects, etc., and thus have higher strength, hardness, wear resistance, corrosion resistance and heat resistance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/04B22F9/04B22F3/105
CPCC22C19/03C22C30/00B22F3/105B22F9/04B22F2009/041B22F2998/10C22C1/047
Inventor 王艳徐静张岚翔
Owner UNIV OF JINAN
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