Mechanical and corrosion properties for various high entropy alloy compositions

Abstract

A high entropy alloy composition and methods of manufacturing such composition are provided. In one embodiment, the composition includes iron (Fe) in a range of 0-30% by weight, nickel (Ni) in a range of 20-55% by weight, cobalt (Co) in a range of 5-45% by weight, chromium (Cr) in a range of 0-40% by weight, aluminum (Al) in a range of 0-20% by weight, manganese (Mn) in a range of 0-5% by weight, and niobium in a range of 0-10% by weight.

The invention is claimed as follows: 
     
         1 . A high entropy alloy, comprising:
 about 0-30% iron, by weight;   about 20-55% nickel, by weight;   about 0-60% cobalt, by weight;   about 0-20% chromium, by weight;   about 0-20% aluminum, by weight;   about 0-5% manganese, by weight; and   about 0-10% niobium, by weight.   
     
     
         2 . The alloy of  claim 1 , wherein the aluminum has a purity of 99.99%. 
     
     
         3 . The alloy of  claim 1 , wherein the cobalt has a purity of 99.95%. 
     
     
         4 . The alloy of  claim 1 , wherein the chromium has a purity of 99.5%. 
     
     
         5 . The alloy of  claim 1 , wherein the iron has a purity of 99.99%. 
     
     
         6 . The alloy of  claim 1 , wherein the nickel has a purity of 99.98%. 
     
     
         7 . The alloy of  claim 1 , wherein the nickel has a purity of 99.95%. 
     
     
         8 . The alloy of  claim 1 , wherein the niobium has a purity of 99.9%. 
     
     
         9 . A high entropy alloy, comprising:
 about 0-25% iron, by atomic ratio;   about 30-60% nickel, by atomic ratio;   about 5-45% cobalt, by atomic ratio;   about 0-40% chromium, by atomic ratio;   about 0-20% aluminum, by atomic ratio;   about 0-10% manganese, by atomic ratio; and   about 0-10% niobium, by atomic ratio.   
     
     
         10 . The alloy of  claim 9 , wherein the aluminum has a purity of 99.99%. 
     
     
         11 . The alloy of  claim 9 , wherein the cobalt has a purity of 99.95%. 
     
     
         12 . The alloy of  claim 9 , wherein the chromium has a purity of 99.5%. 
     
     
         13 . The alloy of  claim 9 , wherein the iron has a purity of 99.99%. 
     
     
         14 . The alloy of  claim 9 , wherein the nickel has a purity of 99.98%. 
     
     
         15 . The alloy of  claim 9 , wherein the nickel has a purity of 99.95%. 
     
     
         16 . The alloy of  claim 9 , wherein the niobium has a purity of 99.9%. 
     
     
         17 . A method for thermomechanical treatment of a high entropy alloy, comprising at least one of:
 annealing the high entropy alloy at temperatures from 1000° C. to 1200° C. in an inert atmosphere;   air cooling the high entropy alloy to room temperature;   cold rolling of the high entropy alloy for a range from 40-90% reduction;   aging of the high entropy alloy at temperatures ranging from 600° C. to 950° C.; and   quenching the high entropy alloy to room temperature.   
     
     
         18 . The method of  claim 17 , wherein the aging is done for 1 hour under mixed gas comprised of 2% hydrogen and 98% argon. 
     
     
         19 . The method of  claim 17 , wherein the annealing takes place in a tube furnace under mixed gas comprised of 2% hydrogen and 98% argon. 
     
     
         20 . The method of  claim 17 , wherein the annealing takes place for up to 2 hours.