Cr Filament-Reinforced CrMnFeNiCu(Ag)-Based High-Entropy Alloy and Method for Manufacturing the Same

Abstract

A Cr filament-reinforced CrMnFeNiCu(Ag)-based high-entropy alloy and a method for manufacturing the same are provided. The high-entropy alloy, according to an exemplary embodiment in the present disclosure, includes, by at. %, Cr in an amount greater than 5% and less than 42%, Mn in an amount greater than 5% and less than 35%, Fe in an amount greater than 5% and less than 35%, Ni in an amount greater than 5% and less than 35%, and at least one of Cu in an amount greater than 3% and less than 35%, and Ag in an amount greater than 3% and less than 35%, and residual inevitable impurities. The high-entropy alloy has a dual phase in which a Cr or a Cr-rich phase is distributed within a matrix of the high-entropy alloy in filament or ribbon form.

What is claimed is: 
     
         1 . A high-entropy alloy comprising:
 by at. %, Cr in an amount greater than 5% and less than 42%, Mn in an amount greater than 5% and less than 35%, Fein an amount greater than 5% and less than 35%, Ni in an amount greater than 5% and less than 35%, and at least one of Cu in an amount greater than 3% and less than 35%, and Ag in an amount greater than 3% and less than 35%; and residual inevitable impurities, wherein the high-entropy alloy has a dual phase in which a Cr or a Cr-rich phase is distributed within a matrix of the high-entropy alloy in filament or ribbon form.   
     
     
         2 . The high-entropy alloy of  claim 1 , wherein the high-entropy alloy further includes, by at. %, at least one of Ti in an amount of 0.02 to 5%, Zr in an amount of 0.02 to 5%, Hf in an amount of 0.02 to 5%, Mo in an amount of 0.02 to 5%, W in an amount of 0.02 to 5%, Si in an amount of 0.02 to 5%, Al in an amount of 0.02 to 5%, V in an amount of 0.02 to 5%, and Ta in an amount of 0.02 to 5%, and precipitates are formed in the matrix. 
     
     
         3 . The high-entropy alloy of  claim 1 , wherein the high-entropy alloy, having the dual phase, is a plate, rod, or wire product. 
     
     
         4 . A method for manufacturing a high-entropy alloy comprising:
 preparing a metallic material, the metallic material comprising, by at. %, Cr in an amount greater than 5% and less than 42%, Mn in an amount greater than 5% and less than 35%, Fe in an amount greater than 5% and less than 35%, Ni in an amount greater than 5% and less than 35%, and at least one of Cu in an amount greater than 3% and less than 35%, and Ag in an amount greater than 3% and less than 35%, and residual inevitable impurities;   manufacturing an alloy with the prepared metallic material by melting (casting) or powder metallurgy;   carrying out a homogenization heat treatment for the manufactured alloy;   primarily processing the homogenization heat treated alloy and then cooling it thus obtained;   carrying out an intermediate heat treatment for the cooled alloy at a temperature of 350 to 600° C.; and   secondarily processing the intermediate heat treated alloy so as to form a composite structure in which a Cr or a Cr-rich phase is distributed within a matrix of the alloy in filament or ribbon form.   
     
     
         5 . The method of  claim 4 , wherein the metallic material further includes, by at. %, at least one of Ti in an amount of 0.02 to 5%, Zr in an amount of 0.02 to 5%, Hf in an amount of 0.02 to 5%, Mo in an amount of 0.02 to 5%, W in an amount of 0.02 to 5%, Si in an amount of 0.02 to 5%, Al in an amount of 0.02 to 5%, V in an amount of 0.02 to 5%, and Ta in an amount of 0.02 to 5%, and precipitates are formed in the Cr filament-reinforced matrix through the intermediate heat treatment. 
     
     
         6 . The method of  claim 4 , further comprising, prior to the homogenization heat treatment of the melted (cast) alloy, rapidly solidifying (quenching) the melted (cast) alloy. 
     
     
         7 . The method of  claim 4 , wherein the homogenization heat treatment is performed at a temperature within a range of 600 to 1,200° C. for 1 to 48 hours. 
     
     
         8 . The method of  claim 4 , wherein the primary and secondary processing is at least one of hot working, rolling, extruding, and room-temperature working. 
     
     
         9 . The method of  claim 4 , wherein at least one of the primary and secondary processing is to form the alloy into one of a plate, a rod, and a wire.