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High-strength and ultra heat-resistant high entropy alloy (HEA) matrix composites and method of preparing the same

a technology of high entropy alloy and composite material, which is applied in the field of high-strength and ultra heat-resistant high entropy alloy (hea) matrix composite material and a method of preparing the same, can solve the problems of reduced powder yield, contamination by balls, and severe reduction of yield, so as to enhance mechanical properties and heat resistance of alloys, the effect of increasing yield

Inactive Publication Date: 2017-11-02
KOREA ADVANCED INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about improving the yield, mechanical properties, and heat resistance of an alloy by reducing a cold welding phenomenon. This is achieved by providing a high entropy alloy (HEA) matrix composite material and a method of preparing it. In simple terms, this invention allows for the creation of stronger and more durable materials using a special mix of alloys.

Problems solved by technology

Currently, such development of alloy materials by addition of trace elements has reached its limit.
In a high-energy milling process using a face-centered cubic (FCC) HEA with a high ductility, cold welding in a ball and a container may occur, which may lead to a reduction in a powder yield and a contamination by the ball.
In a composite HEA to which a reinforcing material is added, the reinforcing material may tend to be a reactive site that causes cold welding, and a yield may be severely reduced due to the cold welding.

Method used

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  • High-strength and ultra heat-resistant high entropy alloy (HEA) matrix composites and method of preparing the same
  • High-strength and ultra heat-resistant high entropy alloy (HEA) matrix composites and method of preparing the same
  • High-strength and ultra heat-resistant high entropy alloy (HEA) matrix composites and method of preparing the same

Examples

Experimental program
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Effect test

example 1

[0067]Mechanical alloying was performed using a planetary mill for 24 hours, to prepare an Al0.3CoCrFeMnNi HEA powder to which 3 vol % of Y2O3 was added. About 5.7 mol % of Al was added as a BCC forming alloy element. A yield of the prepared Al0.3CoCrFeMnNi HEA powder is shown in FIG. 2.

[0068]The prepared 3 vol % Y2O3 / Al0.3CrCrFeMnNi HEA powder was sintered at 900° C. for 5 minutes using a spark plasma sintering method, to prepare a sintered alloy. A phase and a microstructure of the sintered alloy were analyzed and a hardness and a compressive strength of the sintered alloy were measured as shown in FIGS. 3 to 6. The microstructure was obtained by a scanning electron microscope (SEM).

example 2

[0069]Mechanical alloying was performed using a planetary mill for 24 hours, to prepare an Al0.3CoCrFeMnNi HEA powder to which 5 vol % of TiC was added. About 5.7 mol % of Al was added as a BCC forming alloy element. A yield of the prepared Al0.3CoCrFeMnNi HEA powder is shown in FIG. 2.

[0070]The prepared 5 vol % TiC / Al0.3CoCrFeMnNi HEA powder was sintered at 900° C. for 5 minutes using a spark plasma sintering method, to prepare a sintered alloy. A phase and a microstructure of the sintered alloy were analyzed and a hardness of the sintered alloy was measured as shown in FIGS. 3 to 5.

example 3

[0071]Mechanical alloying was performed using a planetary mill for 24 hours, to prepare a Mo0.8CoCrFeMnNi HEA powder. About 13.8 mol % of Mo was added as a BCC forming alloy element. A yield of the prepared Mo0.8CoCrFeMnNi HEA powder is shown in FIG. 2.

[0072]The prepared Mo0.8CoCrFeMnNi HEA powder was sintered at 900° C. for 5 minutes using a spark plasma sintering method, to prepare a sintered alloy. A phase and a microstructure of the sintered alloy were analyzed and a hardness of the sintered alloy was measured as shown in FIGS. 3 to 5.

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Abstract

A high-strength and ultra heat-resistant high entropy alloy (HEA) matrix composite material and a method of preparing the HEA matrix composite material are provided. The HEA matrix composite material may include at least four matrix elements among Co, Cr, Fe, Ni, Mn, Cu, Mo, V, Nb, Ta, Ti, Zr, W, Si, Hf and Al, and a body-centered cubic (BCC) forming alloy element.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of Korean Patent Application No. 10-2016-0053871, filed on May 2, 2016, and Korean Patent Application No. 10-2017-0035200 filed on Mar. 21, 2017, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference.BACKGROUND1. Field of the Invention[0002]At least one example embodiment relates to a high-strength and ultra heat-resistant high entropy alloy (HEA) matrix composite material and a method of preparing the HEA matrix composite material.2. Description of the Related Art[0003]Existing alloy materials have been developed to enhance characteristics, for example, a hardness, a toughness, a heat resistance, a corrosion resistance, and the like, by addition of trace elements based on main metals, for example, Ti, Ni, and the like. Currently, such development of alloy materials by addition of trace elements has reached its limit.[0004]Recently, research on high ent...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C21/00C22C1/04
CPCC22C1/051C22C1/0433C22C21/00B22F2998/10C22C1/1084C22C32/0015C22C32/0047C22C32/0089C22C33/0257B22F3/105B22F2003/1051
Inventor HONG, SOON HYUNGRYU, HO JINLEE, BINLEE, JUN HOPOHAN, RIZALDY MUHAMMAD
Owner KOREA ADVANCED INST OF SCI & TECH
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