Nd-based two-phase separation amorphous alloy

Abstract

Provided is a Nd-based two-phase separation amorphous alloy by adding an element having a big difference in heat of mixing in a Nd-based alloy with a superior amorphous formability through an inherent characteristic of compositional elements and consideration of thermodynamics, at the time of forming amorphous phase, to thereby enable two-phase separation amorphous alloy during solidification. The Nd-based two-phase separation amorphous alloy which is represented as a general equation Nd 100-a-b (TM) a (D) b wherein TM is a transition metal which is a combination of respective one selected from A-B, A-C and B-C when a group of A consists of Y, Ti, Zr, La, Pr, Gd, and Hf, a group of B consists of Fe, and Mn, and a group of C consists of Co, Ni, Cu, and Ag, wherein the content of the element group which constitutes each combination is 5 atomic weight % or greater, and the element selected from each element group is at least one, and wherein D is at least one selected from the group consisting of Al, B, Si and P, and a and b have the range of 20≦a≦80, and 5≦b≦30, respectively, in terms of atomic weight %.

1 . A Nd-based two-phase separation amorphous alloy which is represented as a general equation Nd 100-a-b (TM) a (D) b    wherein TM is a transition metal which is one combination selected from A-B, A-C and B-C when an element group of A consists of Y, Ti, Zr, La, Pr, Gd and Hf, an element group of B consists of Fe and Mn, and an element group of C consists of Co, Ni, Cu and Ag,   wherein the content of the element group which constitutes each combination is 5 atomic weight % or greater, and the element selected from each group is at least one, and   wherein D is at least one selected from the group consisting of Al, B, Si and P, and a and b have the range of 20≦a≦80, and 5≦b≦30, respectively, in terms of atomic weight %.   
   
   
       2 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Zr—Co—Al alloy. 
   
   
       3 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Hf—Co—Al alloy. 
   
   
       4 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Zr—Hf—Co—Al alloy. 
   
   
       5 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Y—Co—Al alloy. 
   
   
       6 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Ti—Co—Al alloy. 
   
   
       7 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—La—Co—Al alloy. 
   
   
       8 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Pr—Co—Al alloy. 
   
   
       9 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Ti—Fe—Al alloy. 
   
   
       10 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Gd—Fe—Al alloy. 
   
   
       11 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Pr—Fe—Al alloy. 
   
   
       12 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Gd—Pr—Fe—Al alloy. 
   
   
       13 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Fe—Co—Al alloy. 
   
   
       14 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Fe—Co—Al—B alloy. 
   
   
       15 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Fe—Co—Al—Si alloy. 
   
   
       16 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Fe—Ni—Al alloy. 
   
   
       17 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Fe—Co—Ni—Al alloy. 
   
   
       18 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Fe—Cu—Al alloy. 
   
   
       19 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Fe—Ag—Al alloy. 
   
   
       20 . The Nd-based two-phase separation amorphous alloy according to  claim 1 , wherein the amorphous alloy is a Nd—Fe—Ag—Cu—Al alloy.