Shaped parts having uniform mechanical properties, comprising solid metallic glass

Abstract

The invention relates to a method for producing a shaped part comprising a solid metallic glass. According to the method, a preform is shaped below the glass transition temperature and is then heated to a temperature above the glass transition temperature.

1 ) A method for the production of a shaped part comprising a bulk metallic glass, characterized by the following steps:
 a. providing a preform comprising a bulk metallic glass,   b. repeated plastic deformation of the preform comprising a bulk metallic glass in several steps with a deformation Δd, wherein the temperature T 1  of the preform is below the glass transition temperature of the bulk metallic glass, and   c. heating the preform to a temperature T 2  above the glass transition temperature and below the crystallization temperature to obtain a shaped part comprising a bulk metallic glass,   wherein the plastic deformation in step b) takes place in such a way that the deformation Δd increases with an increasing number of steps.   
     
     
         2 ) The method according to  claim 1 , wherein the deformation Δd per deformation step is at least 1 μm, particularly at least 5 μm and at most 100 μm, particularly at most 50 μm. 
     
     
         3 ) The method according to  claim 1 , wherein the shaped part is heated in step c) in such a way that the flexural strength of the shaped part is not more than 15% below the value for the preform in step a). 
     
     
         4 ) The method according to  claim 1 , wherein the shaped part is plastically deformed in step b) in at least two and at most 300 steps. 
     
     
         5 ) The method according to  claim 1 , the heating in step c) taking place with the application of a pressure in the range from 1 to 600 MPa to the shaped part. 
     
     
         6 ) The method according to  claim 1 , wherein the pressure is applied between two plane-parallel surfaces. 
     
     
         7 ) The method according to  claim 1 , wherein the bulk metallic glass, by weight, has zirconium or copper as its main component. 
     
     
         8 ) The method according to  claim 1 , wherein the preform is formed after step b) and before step c). 
     
     
         9 ) The method according to  claim 1 , wherein the forming is carried out by hammering, deep drawing, or bending. 
     
     
         10 ) The method according to  claim 1 , wherein the repeated plastic deformation takes place with the aid of at least one roller. 
     
     
         11 ) The method according to  claim 1 , wherein the repeated plastic deformation takes place in each deformation step in the same direction or in alternating directions, particularly in directions orthogonal to one another. 
     
     
         12 ) (canceled) 
     
     
         13 ) (canceled) 
     
     
         14 ) A shaped part comprising a bulk metallic glass, wherein the shaped part has a diameter of at least 200 μm in at least one dimension, characterized in that the bulk metallic glass has a flexural strength of at most 15% which is below the flexural strength of the cast alloy. 
     
     
         15 ) The shaped part according to  claim 14 , wherein the shaped part has a diameter in at least two dimensions in the range of at least 200 μm. 
     
     
         16 ) The shaped part according to  claim 14 , the bulk metallic glass contain-ing zirconium as its main component by weight.