Ni-Based Amorphous Alloy With High Ductility, High Corrosion Resistance and Excellent Delayed Fracture Resistance

Abstract

[Problem] To prepare an amorphous alloy as an authentic industrial-use material with a wide range of applications by solving various problems such as delayed fracture and ductility. [Solution] The alloy includes 63 at % or more of Ni and consists only of, as a semimetal for amorphization, other than P. The semimetal may include, for example, 10 to 25 at % of B and one or more of Cr, Mo, and Nb as remaining main elements.

1 - 7 . (canceled) 
     
     
         8 . A Ni-based amorphous alloy having high ductility, high corrosion resistance, and excellent delayed fracture resistance, wherein
 the Ni-based amorphous alloy comprises 63 at % or more of Ni, comprises 10 at % or more and 25 at % or less of B, as a semimetal for amorphization, and comprises Mo as remaining element, and   optionally the Ni-based amorphous alloy comprises, in addition the above components, one or more elements selected from Cr and Nb, and/or comprises less than 2 at % each of either W, V, Ta, or Co.   
     
     
         9 . The Ni-based amorphous alloy according to  claim 8 , wherein
 the Ni-based amorphous alloy has a high corrosion resistance to hydrochloric acid, sulfuric acid, hydrofluoric acid, phosphoric acid, and caustic soda under a reductive environment, and   has a composition expressed by Ni 100-x-y Mo x B y  where Ni is 66 at % or more, 5 at %≦x≦21 at %, and 10 at %≦y≦25 at %.   
     
     
         10 . The Ni-based amorphous alloy according to  claim 8 , wherein
 the Ni-based amorphous alloy has a high corrosion resistance to hydrochloric acid, sulfuric acid, hydrofluoric acid, sodium hypochlorite, phosphoric acid, and caustic soda under a reductive environment, and   has a composition expressed by Ni 100-x-y-z Mo x Nb y Bz wherein Ni is 71.5 at % or more, 0.1 at %≦x≦15 at %, 0.1 at %≦y≦10 at %, and 10 at %≦z≦20 at %.   
     
     
         11 . The Ni-based amorphous alloy according to  claim 8 , wherein
 the Ni-based amorphous alloy has a high corrosion resistance to hydrochloric acid, sulfuric acid, hydrofluoric acid, sodium hypochlorite, phosphoric acid, and caustic soda under a reductive environment, and   has a composition expressed by Ni 100-x-y-z Cr x Mo y B z  where Ni is 64 at % or more, 10 at %≦x≦25 at %, 0 at %<y≦10 at %, and 10 at %≦z≦25 at %.   
     
     
         12 . The Ni-based amorphous alloy according to  claim 8 , wherein
 the Ni-based amorphous alloy has a high corrosion resistance to hydrochloric acid, sulfuric acid, hydrofluoric acid, sodium hypochlorite, phosphoric acid, and caustic soda under a reductive environment, and   has a composition expressed by Ni 100-w-x-y-z Cr w Mo x Nb y B z  where Ni is 64 at % or more, 0.1 at %≦w≦15 at %, 0.1 at %≦x≦20 at %, 0.1 at %≦y≦10 at %, and 10 at %≦z≦25 at %.   
     
     
         13 . A Ni-based amorphous alloy having a high corrosion resistance to nitric acid, sulfuric acid, sodium hypochlorite, phosphoric acid, and caustic soda under an oxidative environment, wherein
 the Ni-based amorphous alloy has a composition expressed by Ni 100-x-y Cr x B y  where Ni is 63 at % or more, 20 at %≦x, 10 at %≦y, and 35 at %<x+y≦37 at %.