Amorphous nickel-free zirconium alloy

Abstract

An amorphous Nickel-Free Zirconium alloy which is readily formed through copper mold casting, comprising a composition consisting of four elements in which the first element is Zr, the second element is Ti, the third element is Cu and the fourth element is Al, wherein an atomic percent of the first to the fourth elements in the composition are represented by a, b, c and d respectively, wherein a=45˜69%, b=0.25˜8%, c=21˜35%, and d=7.5˜15%, where a sum of a, b, c and d is smaller than or equal to 100%. The composition of the amorphous alloy within the above range is melted in a copper mold to form bulk amorphous materials or parts which have characteristics of high tensile strength, high fracture toughness, low Young's modulus and high corrosion resistance.

1 . An amorphous Nickel-Free Zirconium alloy which is readily formed through copper mold casting, comprising a composition consisting of a first to fourth elements in which the first element is zirconium (Zr), the second element is titanium (Ti), the third element is copper (Cu) and the fourth element is aluminum (Al), wherein an atomic percent of the first to the fourth elements in the composition are represented by a, b, c and d respectively, wherein a=45˜69%, b=0.25˜8%, c=21˜35%, and d=7.5˜15%, where a sum of a, b, c and d is smaller than or equal to 100%. 
     
     
         2 . An amorphous Nickel-Free Zirconium alloy, as recited in  claim 1 , wherein said composition has a chemical formula of Zr a Ti b Cu c Al d  in which a+b has a range of 55˜69%. 
     
     
         3 . An amorphous Nickel-Free Zirconium alloy, as recited in  claim 2 , wherein an atomic percentage of zirconium (Zr) relative to titanium (Ti) is 92˜99.5%, wherein an atomic percentage of titanium (Ti) relative to zirconium (Zr) is 0.5˜8%. 
     
     
         4 . An amorphous Nickel-Free Zirconium alloy, as recited in  claim 3 , wherein in said chemical formula, a+b has a range of 55˜69% in atomic percent, and said fourth element aluminum (Al) has a range of 8˜13% in atomic percent. 
     
     
         5 . An amorphous Nickel-Free Zirconium alloy, as recited in  claim 1 , wherein said composition further consists of a fifth element hafnium (Hf) and has a chemical formula of Zr a Hf e Ti b Cu c Al d , where a, b, c, d, e are atomic percent of the first to fifth elements respectively, wherein a=45˜69%, b=0.25˜8%, c=21˜35%, d=7.5˜15%, b+e=0.25˜15%, where a sum of a, b, c, d and e is equal to 100%. 
     
     
         6 . An amorphous Nickel-Free Zirconium alloy, as recited in  claim 5 , wherein in said chemical formula of said composition Zr a Hf e Ti b Cu c Al d , a+b+e has a range of 55˜69%. 
     
     
         7 . An amorphous Nickel-Free Zirconium alloy, as recited in  claim 6 , wherein an atomic percentage of zirconium (Zr) relative to titanium (Ti) is 92˜99.5%, wherein an atomic percentage of titanium (Ti) relative to zirconium (Zr) is 0.5˜8%. 
     
     
         8 . An amorphous Nickel-Free Zirconium alloy, as recited in  claim 1 , wherein said composition further consists of an additional element niobium (Nb) and has a chemical formula of Zr a Nb f Ti b Cu c Al d , where a, b, c, d, f are atomic percents of the first to fourth elements and the additional element respectively, wherein a=45˜69%, b=0.25˜8%, c=21˜35%, d=7.5˜13%, b+f=0.25˜10%, where a sum of a, b, c, d and f is equal to 100%. 
     
     
         9 . An amorphous Nickel-Free Zirconium alloy, as recited in  claim 8 , wherein in said chemical formula of said composition Zr a Nb f Ti b Cu c Al d , a+b+f has a range of 55˜69%. 
     
     
         10 . An amorphous Nickel-Free Zirconium alloy, as recited in  claim 9 , wherein an atomic percentage of zirconium (Zr) relative to titanium (Ti) is 92˜99.5%, wherein an atomic percentage of titanium (Ti) relative to zirconium (Zr) is 0.5˜8%.