Porous metal

Abstract

A porous metal having a much smaller ligament size is provided. The porous metal includes a crystal of an alloy, the alloy containing n or more kinds of elements, n being an integer of 3 or more, the alloy having a composition of each element of from {(100/n)−(75/n)) at % to {(100/n)+(75/n)} at %, and the porous metal having a ligament size of 220 nm or less. The alloy is preferably a high entropy alloy or a medium entropy alloy. In addition, the alloy preferably contains a solid solution of the respective elements.

1 . A porous metal comprising a crystal of an alloy, the alloy containing n or more kinds of elements, n being an integer of 3 or more, the alloy having a composition of each element of from {(100/n)−(75/n)} at % to {(100/n)+(75/n)} at %, and the porous metal having a ligament size of 220 nm or less. 
     
     
         2 . The porous metal according to  claim 1 , wherein the alloy contains one or more refractory metal elements. 
     
     
         3 . The porous metal according to  claim 2 , wherein the alloy contains (100/n) at % or more of the refractory metal element. 
     
     
         4 . The porous metal according to  claim 1 , wherein the alloy contains a solid solution of the respective elements. 
     
     
         5 . The porous metal according to  claim 1 , wherein the alloy contains 5 kinds of elements and the composition of each element is from 5 at % to 35 at %. 
     
     
         6 . The porous metal according to  claim 5 , wherein the respective elements of the alloy comprise Ti, V, Nb, Mo, and Ta. 
     
     
         7 . The porous metal according to  claim 1 , wherein the alloy is a high entropy alloy or a medium entropy alloy. 
     
     
         8 . The porous metal according to  claim 1 , wherein the ligament size is 5 nm or more and/or 100 nm or less.