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

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.

What is claimed is: 
     
         1 . A high entropy alloy (HEA) matrix composite material comprising:
 at least four matrix elements selected from the group consisting of 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.   
     
     
         2 . The HEA matrix composite material of  claim 1 , further comprising:
 a reinforcing material comprising at least one selected from the group consisting of a metal oxide, a metal silicide, a metal carbide, a metal nitride and a metal boride,   wherein each of the metal oxide, the metal silicide, the metal carbide, the metal nitride and the metal boride comprises at least one selected from the group consisting of Al, Si, Ti, Zr, Ta, Mg, Be, Ba, Zn, Cr, Y, Sn, W, Hf, V, Nb, Mo, W, La and B.   
     
     
         3 . The HEA matrix composite material of  claim 2 , wherein the reinforcing material is present in an amount of 0.01% by volume (vol %) to 50 vol % in the HEA matrix composite material. 
     
     
         4 . The HEA matrix composite material of  claim 1 , wherein a valence electron concentration (VEC) of the BCC forming alloy element is less than or equal to “7.” 
     
     
         5 . The HEA matrix composite material of  claim 1 , wherein the BCC forming alloy element is different from the matrix elements, and comprises at least one selected from the group consisting of, Al, Cr, Mn, Mo, Nb, Ta, Ti, V and W. 
     
     
         6 . The HEA matrix composite material of  claim 1 , wherein the BCC forming alloy element is present in an amount of 0.01% by moles (mol %) to 90 mol % in the HEA matrix composite material. 
     
     
         7 . The HEA matrix composite material of  claim 1 , wherein a VEC of the HEA matrix composite material is less than or equal to “10.” 
     
     
         8 . The HEA matrix composite material of  claim 1 , further comprising:
 a precipitate(s) comprising at least one selected from the group consisting of a metal oxide, a metal silicide, a metal carbide, a metal nitride, a metal boride and an intermetallic compound,   wherein each of the metal oxide, the metal carbide, the metal nitride, the metal boride and the intermetallic compound comprises at least one selected from the group consisting of Co, Cr, Fe, Ni, Mn, Cu, Mo, V, Nb, Al, Si, Ti, Zr, Ta, Mg, Be, Ba, Zn, Cr, Y, Sn, W, Hf, Nb, Mo, W, La and B.   
     
     
         9 . A method of preparing a high entropy alloy (HEA) matrix composite material, the method comprising:
 preparing a powder mixture by mixing a body-centered cubic (BCC) forming alloy element and at least four matrix elements selected from the group consisting of Co, Cr, Fe, Ni, Mn, Cu, Mo, V, Nb, Ta, Ti, Zr, W, Si, Hf and Al;   forming a mechanically alloyed powder by mechanically alloying the powder mixture; and   sintering the mechanically alloyed powder at a high temperature,   wherein the forming of the mechanically alloyed powder comprises bonding the BCC forming alloy element to at least a portion of the matrix elements.   
     
     
         10 . The method of  claim 9 , wherein the forming of the mechanically alloyed powder comprises acquiring a HEA matrix composite material at a yield of 50% or greater using a high-energy ball mill. 
     
     
         11 . The method of  claim 9 , wherein the preparing of the powder mixture comprises adding a reinforcing material to the powder mixture. 
     
     
         12 . The method of  claim 9 , further comprising, after the preparing of the powder mixture or the forming of the mechanically alloyed powder:
 adding a precipitate(s) forming element,   wherein the precipitate(s) forming element comprises at least one selected from the group consisting of Co, Cr, Fe, Ni, Mn, Cu, Mo, V, Nb, Al, Si, Ti, Zr, Ta, Mg, Be, Ba, Zn, Cr, Y, Sn, W, Hf, Nb, Ta, Mo, W, Ta, La and B.   
     
     
         13 . The method of  claim 9 , further comprising, after the sintering of the mechanically alloyed powder:
 forming a precipitate(s),   wherein the forming of the precipitate(s) comprises forming the precipitate(s) by a heat treatment at a temperature of 300° C. to 1500° C.   
     
     
         14 . The method of  claim 9 , wherein the sintering of the mechanically alloyed powder comprises sintering the mechanically alloyed powder at a temperature corresponding to 50% to 99% of a melting point of the mechanically alloyed powder.