Refurbishable works of art are produced on a crystalline metallic surface by forming with plastic deformation an artistic representation, annealing said crystalline surface to relieve the metallic matrix of the imposed energy of plastic deformation in the form of a locally recrystallized surface which is different in crystal grain size and frequently in geometric distribution from the original metallic matrix, and etching said metallic surface to delineate to the eye the pictorial artistic representation composed of crystal grains which are different from those in the contiguous matrix.
A metal article is formed with a relief pattern on its surface by a method comprising shaping the metal article to deform the surface thereof such as by bending a flat sheet, then annealing the thus deformed article above the recrystallization temperature to cause enlargement of the crystal grains. The article is then deformed again, such as by being flattened to its original shape, whereafter the surface of the article is etched. There is produced on the surface a relief pattern which can appear to be raised in part and depressed in part.
A watch dial has an outer surface consisting of metal crystals large enough to be seen by the naked eye. Such crystals are formed by annealing of the metal and may have been treated by etching, coloring, dyeing, coating, oxidation or sulphuration.
A method for the fabrication of a decorative panel having a coarse, enlarged crystalline pattern characterized by applying a large rolling force at a draft ratio in excess of the critical draft ratio to a metal sheet; annealing the metal sheet at a temperature in excess of the recrystallization temperature in order to remove deformations caused by the rolling step; applying a prescribed pattern-like strain figures thereto; annealing the metal sheet in an anti-oxidizing atmosphere at a high temperature in excess of the recrystallization temperature in order to allow coarse, enlarged crystals to form; and subsequently etching the surface of the sheet.
The disclosures relates to a method of forming an array of small apertures in an aluminum foil for receiving semiconductor spheres in said aperature. The apertures are formed by embossing the foil at the locations of the apertures to provide worked metal regions of reduced thickness at said locations. The foil is then etched in toto, etching taking place more rapidly at the worked metal region. Also, due to the reduced thickness of the foil at the embossed regions, such regions are etched away to provide apertures before the remainder of the foil undergoes material metal loss to provide the desired aperture array.
