Pure-aluminum structural material with high specific strength consolidated by giant-strain processing method

Abstract

Disclosed is a structural material using novel, high-purity aluminum, which is produced by using fine aluminum powder as the material, as well as a method for manufacturing such structural material. A processed aluminum material having the properties of an aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities except aluminum and aluminum carbide is characterized in that a material obtained by uniformly dispersing stearic acid in fine aluminum powder is filled in an L-shaped bent die, and pressures are applied to the material from one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is greater than the pressure applied to the material from the other direction of the die, to cause the material to pass through a hole of the L-shaped bent die so that the material is given and accumulates giant strain, and this process is performed continuously.

1 . An aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities, characterized in that a material obtained by uniformly mixing and dispersing stearic acid in fine aluminum powder is filled in an L-shaped bent die at a temperature, and pressures are applied to the material from one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is greater than the pressure applied to the material from the other direction of the die, to cause the material to pass through a hole of the L-shaped bent die so that the material is given and accumulates giant strain. 
     
     
         2 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 1 , characterized in that the material obtained by uniformly mixing and dispersing stearic acid in fine aluminum powder is such that an agitation mixing means of fine aluminum powder and stearic acid is used to uniformly disperse stearic acid in fine aluminum powder. 
     
     
         3 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 2 , characterized in that the agitation mixing means is a ball mill. 
     
     
         4 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 1 , characterized in that the material is filled in the L-shaped bent die at the consolidation temperature, pressures are applied to the material from one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is greater than the pressure applied to the material from the other direction of the die, to cause the material to pass through the hole of the L-shaped bent die so that the material is given and accumulates giant strain, after which the material, which has been given and accumulated giant strain after passing through the hole of the L-shaped bent die, is re-circulated and supplied to the one direction of the die, to be filled in the L-shaped bent die at the consolidation temperature, and then pressures are applied to the material from the one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is greater than the pressure applied to the material from the other direction of the die, to cause the material to pass through the hole of the L-shaped bent die so that the material is given and accumulates giant strain, and the above is repeated. 
     
     
         5 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 1 , characterized in that the consolidation temperature is in a range of 60° C. to 350° C. 
     
     
         6 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 1 , characterized in that the material is filled in the L-shaped bent die at the consolidation temperature, pressures are applied to the material from one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is greater than the pressure applied to the material from the other direction of the die, to cause the material to pass through the hole of the L-shaped bent die so that the material is given and accumulates giant strain, after which the material, which has been given and accumulated giant strain after passing through the hole of the L-shaped bent die, is removed and re-circulated and supplied to the one direction of the die, to be filled in the L-shaped bent die, which is then heated from the outside at the consolidation temperature or higher, and then pressures are applied to the material from the one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is greater than the pressure applied to the material from the other direction of the die, to cause the material to pass through the hole of the L-shaped bent die so that the material is given and accumulates giant strain. 
     
     
         7 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 6 , characterized in that the heating of the L-shaped bent die from the outside at the consolidation temperature or higher is implemented at a temperature in a range of 400° C. to 500° C. 
     
     
         8 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 1 , wherein the aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities has a shape selected from a sheet, circular cylinder, prism, hexagonal cylinder, hollow circular cylinder, hollow prism and hollow hexagonal cylinder. 
     
     
         9 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 1 , characterized in that the Vickers hardness of the aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities is 125HV or higher. 
     
     
         10 . An aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities, characterized in that a material obtained by uniformly dispersing stearic acid in fine aluminum powder is filled in an L-shaped bent die at a consolidation temperature, and pressures are applied to the material from one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is greater than the pressure applied to the material from the other direction of the die, to cause the material to pass through a hole of the L-shaped bent die so that the material is given and accumulates giant strain, after which the material, which has been given and accumulated giant strain, is supplied to the die from the other direction to the one direction of the die, to be filled in the L-shaped bent die at the consolidation temperature, and then pressures are applied to the material from the one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is smaller than the pressure applied to the material from the other direction of the die, to cause the material to pass through the hole of the L-shaped bent die so that the material is given and accumulates giant strain. 
     
     
         11 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 10 , characterized in that the material obtained by uniformly dispersing stearic acid in fine aluminum powder is such that an agitation mixing means of fine aluminum powder and stearic acid is used to uniformly disperse stearic acid in fine aluminum powder. 
     
     
         12 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 11 , characterized in that the agitation mixing means is a ball mill. 
     
     
         13 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 10 , characterized in that the consolidation temperature is in a range from 60° C. to 350° C. 
     
     
         14 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 10 , characterized in that the material that has been given and accumulated giant strain is supplied to the die from the other direction to the one direction of the die, to be filled in the L-shaped bent die at the consolidation temperature, and then pressures are applied to the material from the one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is smaller than the pressure applied to the material from the other direction of the die, to cause the material to pass through the hole of the L-shaped bent die so that the material is given and accumulates giant strain, and the material is removed from the one direction of the die and then filled in the L-shaped bent die at the consolidation temperature, and pressures are applied to the material from the one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is greater than the pressure applied to the material from the other direction of the die, to cause the material to pass through the hole of the L-shaped bent die so that the material is given and accumulates giant strain, after which the material is supplied to the die from the other direction to the one direction of the die, to be filled in the L-shaped bent die at the consolidation temperature, and then pressures are applied to the material from the one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is smaller than the pressure applied to the material from the other direction of the die, to cause the material to pass through the hole of the L-shaped bent die so that the material is given and accumulates giant strain, and the above is repeated. 
     
     
         15 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 10 , characterized in that the material that has been given and accumulated giant strain is supplied to the die from the other direction to the one direction of the die, to be filled in the L-shaped bent die at the consolidation temperature, and then pressures are applied to the material from the one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is smaller than the pressure applied to the material from the other direction of the die, to cause the material to pass through the hole of the L-shaped bent die so that the material is given and accumulates giant strain, where the L-shaped bent die is heated from the outside at the consolidation temperature or higher and in this condition the material obtained by uniformly dispersing stearic acid in fine aluminum powder is filled in the L-shaped bent die at the consolidation temperature, after which pressures are applied to the material from the one direction and the other direction of the die wherein the pressure applied to the material from the one direction of the die is greater than the pressure applied to the material from the other direction of the die, to cause the material to pass through the hole of the L-shaped bent die so that the material is given giant strain. 
     
     
         16 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 15 , characterized in that the heating of the L-shaped bent die from the outside at the consolidation temperature or higher is implemented at a temperature in a range of 400° C. to 500° C. 
     
     
         17 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 10 , wherein the aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities has a shape selected from a sheet, circular cylinder, prism, hexagonal cylinder, hollow circular cylinder, hollow prism and hollow hexagonal cylinder. 
     
     
         18 . The aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities according to  claim 10 , characterized in that the Vickers hardness of the aluminum structural material constituted by aluminum, aluminum carbide and unavoidable impurities is 125HV or higher.