Oxide dispersion strengthened (ODS) high-entropy alloy and preparation method thereof

Abstract

The invention provides oxide dispersion strengthened (ODS) high-entropy alloy and a preparation method thereof, and belongs to the field of structural metallic materials. Pure metal powder with a certain composition proportion and oxide particles of a certain content are mixed, and then ODS high-entropy alloy powder is prepared through a mechanical alloying method; and then the final ODS high-entropy alloy is obtained through a spark plasma sintering (SPS) method. The prepared ODS high-entropy alloy is mainly composed of a solid solution phase (95% or above) and a small amount of evenly-dispersed nanometer oxide particles, and has the excellent comprehensive mechanical property and good thermal stability; and the compressive strength of the FeCoNiCrAl-based ODS high-entropy alloy composed of the face-centered cubic structure (FCC) solid solution and the body-centered cubic structure (BCC) solid solution is higher than 3500 MPa, and compressive strain of the high-entropy alloy can reach 10%. The high-entropy alloy has high strength, high hardness, high corrosion resistance, high abrasion resistance, and excellent thermal stability and irradiation resistance, and has potential application prospects in the fields of aerospace, metallurgy, the chemical industry, electrical energy and the like.

Description

technical field [0001] The invention belongs to the field of metal structural materials and provides an oxide dispersion strengthened (ODS) high-entropy alloy and a preparation method thereof. Background technique [0002] Oxide dispersion strengthened (ODS) alloys generally use powder metallurgy technology to uniformly add fine oxides with thermal and chemical stability into the alloy matrix. These oxide particles can be used as dispersion strengthening particles to pin dislocations and grain boundaries at high temperatures where solid solution strengthening and precipitation strengthening fail, hindering dislocation movement and recrystallization, thereby effectively improving the high temperature mechanical properties and resistance of materials. Irradiation performance. The commonly used oxide is Y 2 o 3 、Al 2 o 3 , ThO 2 Wait. At present, the research on the microstructure, properties and processing technology of ODS alloys has become one of the research hotspots...

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Problems solved by technology

However, single-phase high-entropy alloys also have obvious shortcomings: high-entropy alloys with FCC solid solution structure have good toughness but low yield strength; while high-entropy alloys with BCC solid solution structure have high strength but poor plasticity

[0005] Most of the current research is to improve the mechanical properties of high-entropy alloys through endogenous precipitation strengthening and solid solution strengthening, but there are not many studies on exogenous ODS high-entropy alloys.

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