Method for producing high-strength superplastic material

Abstract

Provided is a method for producing a high-strength superplastic material which enables a high-strength superplastic material having a metal structure formed from fine grains to be easily obtained. After the application of an ultrasonic wave to a metal material, this metal material is subjected to a heating treatment at a temperature obtained by multiplying a melting point of the material represented by absolute temperature by 0.35 to 0.6. The most suitable metal material is a high damping metal material having a specific damping capacity of not less than 10% and, in particular, Mg or an Mg alloy.

1 . A method for producing a high-strength superplastic material, wherein after the application of a supersonic wave to a metal material, the metal material is subjected to a heating treatment at a temperature obtained by multiplying a melting point of the metal material represented by absolute temperature by 0.35 to 0.6.  
   
   
       2 . The method for producing a high-strength superplastic material according to  claim 1 , wherein the metal material is a high damping metal material having a specific damping capacity of not less than 10%.  
   
   
       3 . The method for producing a high-strength superplastic material according to  claim 2 , wherein the high damping metal material having a specific damping capacity of not less than 10% is Mg or an Mg alloy.  
   
   
       4 . The method for producing a high-strength superplastic material according to  claim 1 , wherein the temperature obtained by multiplying a melting point of the metal material represented by absolute temperature by 0.35 to 0.6 is the recrystallization temperature of the metal material.  
   
   
       5 . The method for producing a high-strength superplastic material according to  claim 2 , wherein the temperature obtained by multiplying a melting point of the metal material represented by absolute temperature by 0.35 to 0.6 is the recrystallization temperature of the metal material.  
   
   
       6 . The method for producing a high-strength superplastic material according to  claim 3 , wherein the temperature obtained by multiplying a melting point of the metal material represented by absolute temperature by 0.35 to 0.6 is the recrystallization temperature of the metal material.