High-entropy alloy and manufacturing method therefor

Abstract

The present disclosure relates to a high-entropy alloy and a manufacturing method therefor, and in particular, a high-entropy alloy and a manufacturing method therefor that comprises a multi-element alloy matrix and Cu, and comprises an alloy having a face-centered cubic (FCC)-based phase, such that the high-entropy alloy may have greater hardness and strength than an existing transition metal alloy while maintaining a FCC-based single phase, and has high lubricity.

What is claimed is: 
     
         1 . A high-entropy alloy, comprising:
 a multi-element alloy matrix and Cu,   wherein the multi-element alloy matrix includes three or more elements among Cr, Co, Ni and Mo, and   the high-entropy alloy has a face-centered cubic (FCC)-based single phase.   
     
     
         2 . The high-entropy alloy of  claim 1 , wherein the multi-element alloy matrix is expressed by Chemical Formula 1 as follows:
   Cr a Co b Ni c Cu x ,  [Chemical formula 1]
   wherein the Chemical Formula 1 is satisfied by a+b+c+x=1 and O<x≤0.2.   
     
     
         3 . The high-entropy alloy of  claim 2 , wherein in the Chemical Formula 1 x satisfies 0.02≤x≤0.2. 
     
     
         4 . The high-entropy alloy of  claim 1 , wherein the multi-element alloy matrix is expressed by Chemical Formula 2 as follows:
   Mo a Co b Ni c Cu x ,  [Chemical formula 2]
   wherein the Chemical Formula 2 is satisfied by a+b+c+x=1 and O<x≤0.2.   
     
     
         5 . The high-entropy alloy of  claim 4 , wherein in the Chemical Formula 2 x satisfies 0.1≤x≤0.2. 
     
     
         6 . A manufacturing method for a high-entropy alloy, comprising:
 providing a mixture powder by mixing a multi-element alloy matrix and a Cu powder;   heating the mixture power, and casting the heated mixture powder to provide a cast alloy;   rolling the cast alloy and providing an alloy material; and   thermally treating the alloy material and providing the high-entropy alloy,   wherein the multi-element alloy matrix includes three or more elements among Cr, Co, Ni and Mo, and the high-entropy alloy has a face-centered cubic (FCC)-based single phase.   
     
     
         7 . The manufacturing method of  claim 6 , wherein the thermally treating is performed in a vacuum atmosphere, an inert gas atmosphere, an oxygen atmosphere, or an atmosphere including at least one of nitrogen, boron and carbon. 
     
     
         8 . The manufacturing method of  claim 6 , wherein the thermally treating is performed at 200° C. to 1300° C. for 1 to 24 hours. 
     
     
         9 . The manufacturing method of  claim 6 , wherein the multi-element alloy matrix is expressed by Chemical Formula 1 as follows:
   Cr a Co b Ni c Cu x ,  [Chemical formula 1]
   wherein the Chemical Formula 1 is satisfied by a+b+c+x=1 and O<x≤0.2.   
     
     
         10 . The manufacturing method of  claim 9 , wherein the Chemical Formula 1 is satisfied by x being 0.02≤x≤0.2. 
     
     
         11 . The manufacturing method of  claim 6 , wherein the multi-element matrix element is expressed by the following Chemical Formula 2:
   Mo a Co b Ni c Cu x ,  [Chemical formula 2]
   wherein the Chemical Formula 2 is satisfied by a+b+c+x=1 and O<x≤0.2.   
     
     
         12 . The manufacturing method of  claim 11 , wherein the Chemical Formula 2 is satisfied by x being 0.1≤x≤0.2. 
     
     
         13 . A method of producing a high-entropy alloy, comprising:
 mixing a multi-element alloy matrix and Cu to provide a mixture powder;   heating the mixture power;   rolling the heated mixture powder and providing an alloy material; and   heating the alloy material and providing the high-entropy alloy,   wherein the multi-element alloy matrix includes three or more elements among Cr, Co, Ni and Mo, and the high-entropy alloy has a face-centered cubic (FCC)-based single phase.   
     
     
         14 . The method of  claim 13 , wherein the heating the alloy material is performed in a vacuum atmosphere, an inert gas atmosphere, an oxygen atmosphere, or an atmosphere including at least one of nitrogen, boron and carbon. 
     
     
         15 . The method of  claim 13 , wherein the heating the alloy material is performed at 200° C. to 1300° C. for 1 to 24 hours. 
     
     
         16 . The method of  claim 13 , wherein the multi-element alloy matrix is expressed by Chemical Formula 1 as follows:
   Cr a Co b Ni c Cu x ,  [Chemical formula 1]
   wherein the Chemical Formula 1 is satisfied by a+b+c+x=1 and O<x≤0.2.   
     
     
         17 . The method of  claim 16 , wherein the Chemical Formula 1 is satisfied by x being 0.02≤x≤0.2. 
     
     
         18 . The method of  claim 13 , wherein the multi-element matrix element is expressed by the following Chemical Formula 2:
   Mo a Co b Ni c Cu x ,  [Chemical formula 2]
   wherein the Chemical Formula 2 is satisfied by a+b+c+x=1 and O<x≤0.2.   
     
     
         19 . The method of  claim 18 , wherein the Chemical Formula 2 is satisfied by x being 0.1≤x≤0.2.