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Method of preparing oxide dispersion strengthening medium-entropy alloy

A technology of dispersion strengthening and entropy alloying, which is applied in the field of preparation of medium-entropy alloy materials, can solve the problems of excessively large oxide particles, which have not been seen in literature reports, and achieve the effect of uniform distribution.

Inactive Publication Date: 2018-08-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been reports on the preparation of oxide dispersion-strengthened high-entropy alloys by mechanical alloying, there is still the problem that the oxide particles are too large, and there are no literature reports on the preparation of oxide dispersion-strengthened medium-entropy alloys by mechanical alloying. see

Method used

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  • Method of preparing oxide dispersion strengthening medium-entropy alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Weigh Cr, Ni, Co metal powders of equal atomic weight, choose coarse powder with a particle size of 45-20 μm for Ni, and fine powder with 10-5 μm for Co and Cr, and weigh 1.5wt% Y 2 o 3 powder, 0.4wt% Ti powder, Y 2 o 3 The nanometer powder of 30-20nm is selected, and the coarse powder of 45-30μm is selected as the Ti powder. After being fully mixed, the mixed powder is placed in a hydrogen reduction furnace for reduction at 400° C. for 1 hour.

[0022] 2. Under an argon atmosphere, encapsulate the alloyed metal powder in a ball mill jar with a ball-to-material ratio of 10:1, add 6wt% ethanol, fix the ball mill jar in a planetary ball mill, and mill at 350 rpm for 70 hours.

[0023] 3. The alloy powder after ball milling is sintered and formed in a spark plasma sintering furnace under the conditions of 1050°C, 50Mpa, and 8min.

[0024] 4. Under an inert atmosphere, heat-treat the sintered alloy ingot. The heat treatment conditions are 850°C, heat preservation for...

Embodiment 2

[0028] 1. Weigh Cr, Ni, Co metal powders of equal atomic weight, choose coarse powder with a particle size of 45-20 μm for Ni, and fine powder with 10-5 μm for Co and Cr, and weigh 1wt% Y 2 o 3 powder, 0.4wt% Ti powder, Y 2 o 3 The nanometer powder of 30-20nm is selected, and the coarse powder of 45-30μm is selected as the Ti powder. After being fully mixed, the mixed powder is placed in a hydrogen reduction furnace and reduced for 0.5h at 450°C.

[0029] 2. Under an argon atmosphere, encapsulate the alloyed metal powder in a ball mill jar with a ball-to-material ratio of 15:1, add 6wt% ethanol, fix the ball mill jar in a planetary ball mill, and mill at 300 rpm for 70 hours.

[0030] 3. The alloy powder after ball milling is sintered and formed in a spark plasma sintering furnace under the conditions of 1050°C, 50Mpa, and 8min.

[0031] 4. Under an inert atmosphere, heat-treat the sintered alloy ingot. The heat treatment conditions are 1050°C, heat preservation for 12h, a...

Embodiment 3

[0034] 1. Weigh Cr, Ni, Co metal powders of equal atomic weight, choose coarse powder with a particle size of 45-20 μm for Ni, and fine powder with 10-5 μm for Co and Cr, and weigh 1.5wt% Y 2 o 3 powder, 0.64wt% Ti powder, Y 2 o 3 The nanometer powder of 30-20nm is selected, and the coarse powder of 45-30μm is selected as the Ti powder. After being fully mixed, the mixed powder is placed in a hydrogen reduction furnace and reduced for 0.5h at 450°C.

[0035] 2. Under an argon atmosphere, encapsulate the alloyed metal powder in a ball mill jar with a ball-to-material ratio of 10:1, add 6wt% ethanol, fix the ball mill jar in a planetary ball mill, and mill at 300 rpm for 80 hours.

[0036] 3. The alloy powder after ball milling is sintered and formed in a spark plasma sintering furnace under the conditions of 1050°C, 50Mpa, and 8min.

[0037] 4. Under an inert atmosphere, heat-treat the sintered alloy ingot. The heat treatment conditions are 950°C, heat preservation for 18h,...

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Abstract

The invention relates to a method of preparing an oxide dispersion strengthening medium-entropy alloy and belongs to the field of preparation of medium-entropy alloy materials. The method comprises the following steps: firstly, weighing metal powder equal in atomic weight and weighing a proper amount of Y2O3 powder and Ti powder; reducing the metal powder in a hydrogen reduction furnace after fully mixing; then encapsulating the metal powder with grinding balls together in a stainless steel ball-milling tank to be ball-milled in an inert gas atmosphere for alloying the metal powder; sinteringthe ball-milled alloyed metal powder into blocks through a discharge plasma sintering furnace for curing the alloy powder; and then thermally treating the sintered and formed blocks in a muffle furnace; and then air cooling the furnace. The nanometer oxides in the prepared oxide dispersion strengthening medium-entropy alloy are uniform in particle distribution, and the average dimensions are 5-6nm, the average dimensions of the oxide particles are 5-20nm, and the density of the sintered sample reaches over 99% of theoretical density.

Description

technical field [0001] The invention belongs to the field of preparation of medium-entropy alloy materials, and in particular relates to a method for strengthening medium-entropy alloys by using oxide dispersion. Background technique [0002] Compared with conventional alloys, medium-entropy alloys generally have two to four principal elements in close or equiatomic ratios. Similar to high-entropy alloys, medium-entropy alloys have many excellent properties, such as high-temperature stability, high hardness, excellent corrosion resistance and wear resistance, and improved fatigue and fracture resistance of materials. Up to now, there have been reports on the preparation of medium-entropy alloys by arc melting and vacuum induction melting (Bernd Gludovatz, Anton Hohenwarter. Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures[J].Nature Communications,7(2016) 10602. G. Laplanche, A. Kostka. Reasons for the superior mechanical properties of ...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F9/04B22F3/105C22C1/05C22C32/00C22C30/00
CPCB22F3/105B22F9/04B22F9/22B22F2003/1051B22F2009/041B22F2009/043B22F2998/10C22C1/05C22C30/00C22C32/0015B22F2003/248
Inventor 常永勤李吴铭郭远航李明洋
Owner UNIV OF SCI & TECH BEIJING
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