High-tensile, malleable molded bodies of titanium alloys

Abstract

The object of the invention is to create high-tensile molded bodies that are made of titanium alloys and are malleable at room temperature and that, compared with the metallic glasses, have macroscopic plasticity and work hardening, without other properties, such as breaking resistance, elastic elongation or corrosion behavior being thus greatly impaired. The molded bodies according to the invention are characterized in that they are made of a material that in its composition conforms to the formula Ti a E1 b E2 c E3 d E4 e , where E1 comprises one or more elements of the group containing the elements Ta, Nb, Mo, Cr, W, Zr, V, Hf and Y, E2 comprises one or more elements of the group containing the elements Cu, Au, Ag, Pd and Pt, E3 comprises one or more elements of the group containing the elements Ni, Co, Fe, Zn, Mn and E4 comprises one or more elements of the group containing the elements Sn, Al, Ga, Si, P, C, B, Pb and Sb, where a=100−(b+c+d+e), b=0 to 20, c=5 to 30, d=5 to 30, e=1 to 15 (a, b, c, d, e in atomic %). The molded bodies have a homogenous microstructure, mainly comprising a glassy or nanocrystalline matrix with ductile dendritic body-centered cubic phase embedded therein. A third phase with low volumetric proportion can be present. Such molded bodies can be used as high-stress components, e.g., in the aircraft industry, space aviation and the automobile industry, but also for medical technical equipment and implants in the medical field.

1 . High-tensile molded body malleable at room temperature and made of titanium alloy, wherein the molded body is made of a material composed of a composition which conforms to the formula  
       Ti a E1 b E2 c E3 d E4 e    
     where 
 E1 comprises at least one element of elements Ta, Nb, Mo, Cr, W, Zr, V, Hf and Y,  
 E2 comprises at least one element of elements Cu, Au, Ag, Pd and Pt,  
 E3 comprises at least one element of elements Ni, Co, Fe, Zn and Mn, and  
 E4 comprises at least one element of elements Sn, Al, Ga, Si, P, C, B, Pb and Sb  
 where  
 a=100−(b+c+d+e)  
 b=0 to 20  
 c=5 to 30  
 d=5 to 30  
 e=1 to 15  
 (a, b, c, d, e in atomic %) and with possibly low additives and impurities due to manufacture,  
 and that the molded body has a structure with a homogenous microstructure, mainly comprising a glassy or nanocrystalline matrix with ductile dendritic body-centered cubic phase embedded therein, and a third phase with a low volumetric proportion of a maximum of 10% can be contained.  
 
   
   
       2 . The molded body according to  claim 1 , wherein the material has a composition with b=0-15, c=20-25, d=15-25 and e=5-10 (atomic %).  
   
   
       3 . The molded body according to  claim 1 , wherein a volumetric proportion of the formed dendritic body-centered cubic phase in the matrix is 20-90%.  
   
   
       4 . The molded body according to  claim 1 , wherein a length of the primary dendrite axes is in the range of 1-100 μm and a radius of the primary dendrites is 0.2-2 μm.  
   
   
       5 . The molded body according to  claim 3 , wherein the volumetric proportion of the formed dendritic body-centered cubic phase in the matrix is 50-70%.  
   
   
       6 . The molded body according to  claim 1 , wherein the material conforms to the composition  
       Ti a E1 b E2 c E3 d E4 e    
     where 
 E2 comprises Cu,  
 E3 comprises Ni, and  
 E4 comprises Sn  
 where  
 a=45-55  
 b=0  
 c=20-25  
 d=15-25  
 e=5-10.  
 
   
   
       7 . A method of forming a high-tensile molded body malleable at room temperature and made of titanium alloy, comprising casting a titanium alloy melt in a copper mold, the titanium alloy comprising a composition which conforms to the formula  
       Ti a E1 b E2 c E3 d E4 e    
     where 
 E1 comprises at least one element of elements Ta, Nb, Mo, Cr, W, Zr, V, Hf and Y,  
 E2 comprises at least one element of elements Cu, Au, Ag, Pd and Pt,  
 E3 comprises at least one element of elements Ni, Co, Fe, Zn and Mn, and  
 E4 comprises at least one element of elements Sn, Al, Ga, Si, P, C, B, Pb and Sb  
 where  
 a=100−(b+c+d+e)  
 b=0 to 20  
 c=5 to 30  
 d=5 to 30  
 e=1 to 15  
 (a, b, c, d, e in atomic %) and with possibly low additives and impurities due to manufacture,  
 and the molded body having a structure with a homogenous microstructure, mainly comprising a glassy or nanocrystalline matrix with ductile dendritic body-centered cubic phase embedded therein, and a third phase with a low volumetric proportion of a maximum of 10% can be contained.  
 
   
   
       8 . The method according to  claim 7 , wherein the material has a composition with b=0-15, c=20-25, d=15-25 and e=5-10 (atomic %).  
   
   
       9 . The method according to  claim 7 , wherein a volumetric proportion of the formed dendritic body-centered cubic phase in the matrix is 20-90%.  
   
   
       10 . The method according to  claim 7 , wherein a length of primary dendrite axes is in the range of 1-100 μm and a radius of the primary dendrites is 0.2-2 μm.  
   
   
       11 . The method according to  claim 9 , wherein the volumetric proportion of the formed dendritic body-centered cubic phase in the matrix is 50-70%.  
   
   
       12 . The molded body according to  claim 7 , wherein the material conforms to the composition  
       Ti a E1 b E2 c E3 d E4 e    
     where 
 E2 comprises Cu,  
 E3 comprises Ni, and  
 E4 comprises Sn  
 where  
 a=45-55  
 b=0  
 c=20-25  
 d=15-25  
 e=5-10.