Patent ID: 8424745

Claim:
A method of forming a composite sheet comprising: a. providing a first sheet having a surface and comprising an untextured metal or alloy; b. providing a second sheet having a surface and comprising an untextured metal or alloy; c. disposing the first sheet and the second sheet in an aligned opposing position with at least a portion of the surface of the first sheet touching the surface of the second sheet to form a contact area; d. bonding the first sheet to the second sheet at least in part by applying an oscillating ultrasonic force to at least one of the first sheet and the second sheet to form an untextured intermediate composite sheet; and e. annealing the untextured intermediate composite sheet at a temperature lower than a primary re-crystallization temperature of the second sheet and higher than a primary re-crystallization temperature of the first sheet to convert the untextured first sheet into a cube textured sheet, wherein the cube texture is characterized by a φ-scan having a FWHM of no more than 15° in all directions, the second sheet remaining untextured, to form a composite sheet.