초록 ▼

A method of enhancing the strength of metals by affecting subsurface zones developed during the application of large sliding loads. Stresses which develop locally within the near surface zone can be many times larger than those predicted from the applied load and the friction coefficient. These stre

A method of enhancing the strength of metals by affecting subsurface zones developed during the application of large sliding loads. Stresses which develop locally within the near surface zone can be many times larger than those predicted from the applied load and the friction coefficient. These stress concentrations arise from two sources: 1) asperity interactions and 2) local and momentary bonding between the two surfaces. By controlling these parameters more desirable strength characteristics can be developed in weaker metals to provide much greater strength to rival that of steel, for example.

대표청구항 ▼

[ What is claimed is:] [1.] A new material comprising:a. a substrate of original material with a first crystalline structure; andb. a surface portion of the original material having a second crystalline structure of a finer structure than that of said substrate and integral with said substrate said

[ What is claimed is:] [1.] A new material comprising:a. a substrate of original material with a first crystalline structure; andb. a surface portion of the original material having a second crystalline structure of a finer structure than that of said substrate and integral with said substrate said surface portion being formed by a confined sliding heavy loading physical deformation of said original material. [8.] A method for imparting strength to the surface of a metal or metal alloy by surface modification, comprising:a) arranging the metal to be treated such that a portion of its surface is confined and exposed to a tool;b) applying a force to the metal being treated to create a pressure normal to the interface between the portion of the metal surface and the tool; andc) sliding the tool along the confined portion of the metal surface to impart a shear force to the confined portion of the metal surface sufficient to create shear deformation of the metal surface.