High-entropy alloy and method for manufacturing same

Abstract

A high-entropy alloy according to the present embodiment is a high-entropy alloy having an iron-rich phase and a copper-rich phase, and comprises a common complete solid solution metal that is completely solid-solved in iron and copper respectively. For example, the common complete solid solution metal may comprise nickel.

What is claimed is: 
     
         1 . A high-entropy alloy having an iron-rich phase and a copper-rich phase,
 wherein the high-entropy alloy comprises a common complete solid solution metal that is completely solid-solved in iron and copper respectively.   
     
     
         2 . The high-entropy alloy of  claim 1 , wherein the common complete solid solution metal comprises nickel (Ni). 
     
     
         3 . The high-entropy alloy of  claim 1 , further comprising:
 a melting point lowering element for lowering a melting point of the high-entropy alloy.   
     
     
         4 . The high-entropy alloy of  claim 3 , wherein the melting point lowering element comprises at least one of carbon, silicon, phosphorus, and manganese. 
     
     
         5 . The high-entropy alloy of  claim 1 , wherein the high-entropy alloy further comprises at least one of aluminum, manganese, and chromium. 
     
     
         6 . The high-entropy alloy of  claim 1 , wherein the high-entropy alloy comprises 15 to 80 at % iron, 1 to 30 at % copper, 1 to 20 at % nickel, 5 to 20 at % aluminum, 0 to 20 at % manganese, 0 to 15 at % chromium, 0 to 5 at % carbon, 0 to 2 at % silicon, 0 to 2 at % phosphorus, and other unavoidable impurities. 
     
     
         7 . The high-entropy alloy of  claim 1 , wherein a content of the copper in the iron-rich phase ranges from 5 to 30 at %. 
     
     
         8 . The high-entropy alloy of  claim 1 , wherein the iron-rich phase is contained in a larger volume ratio than the copper-rich phase to be present as a main phase, and the copper-rich phase is partially present. 
     
     
         9 . A method for manufacturing a high-entropy alloy, comprising:
 an iron melting step of melting an iron-containing material including a melting point lowering element and iron to form a molten metal;   a high melting point material melting step of putting a high melting point element that has a melting point higher than that of the iron-containing material into the molten metal, and melting the high melting point element;   a copper melting step of putting copper into the molten metal, and then melting the copper; and   a low melting point material melting step of putting a low melting point material that has a melting point lower than that of the copper, and then melting the low melting point material.   
     
     
         10 . The method of  claim 9 , wherein the iron-containing material comprises pig iron. 
     
     
         11 . The method of  claim 9 , wherein the melting point lowering element comprises at least one of carbon, silicon, phosphorus, and manganese. 
     
     
         12 . The method of  claim 9 , wherein at least two of a first melting temperature of the iron melting step, a second melting temperature of the high melting point material melting step, a third melting temperature of the copper melting step, and a fourth melting temperature of the low melting point material melting step have different temperatures. 
     
     
         13 . The method of  claim 12 , wherein the second melting temperature is higher than the first melting temperature, the third melting temperature is lower than the second melting temperature, and the fourth melting temperature is lower than the third melting temperature. 
     
     
         14 . The method of  claim 9 , wherein the high-entropy alloy comprises a common complete solid solution metal that is completely solid-solved in iron and copper respectively. 
     
     
         15 . The method of  claim 9 , wherein the high melting point material comprises at least one of nickel and chromium. 
     
     
         16 . The method of  claim 9 , wherein the low melting point material comprises aluminum. 
     
     
         17 . The method of  claim 16 , wherein, in the low melting point material melting step, aluminum ingot is pushed into a bottom portion of the molten metal to be melted. 
     
     
         18 . A method for manufacturing a high-entropy alloy, comprising:
 a basic step of putting a plurality of materials including iron, copper, and a common complete solid solution metal that is completely solid-solved in iron and copper respectively;   a step of forming inert gas atmosphere after vacuum; and   a melting step of melting the plurality of materials.   
     
     
         19 . The method of  claim 18 , wherein the plurality of materials further comprise at least one of carbon, silicon, phosphorus, aluminum, manganese, and chromium, and the common complete solid solution metal comprises nickel. 
     
     
         20 . The method of  claim 18 , wherein the iron comprises pig iron or pure iron.