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Process for engineering coherent twin and coincident site lattice grain boundaries in polycrystalline materials

  • US 5,651,839 A
  • Filed: 10/26/1995
  • Issued: 07/29/1997
  • Est. Priority Date: 10/26/1995
  • Status: Expired due to Fees
First Claim
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1. A process for producing, in a planar film of polycrystalline material containing a dopant, chains of grains oriented in the same direction which are separated by boundaries within said chains selected from the group consisting of coherent twin, incoherent twin, coincident site lattice, low angle tilt and high angle tilt boundaries, and in which adjacent said chains in said planar film are separated by dopant-rich random boundaries, said process comprising heating selected areas of said planar film so as to provide at least one temperature gradient of at least 50°

  • Cm-1 across said planar film and a zone of uniform temperature, which is below the melting temperature of said polycrystalline material, through said planar film in a direction perpendicular to a planar surface thereof, for a sufficient time so as to cause preferential nucleation of grains of said material in said zone of uniform temperature and induce recrystallization in said zone of uniform temperature and thereby produce a selected one of said boundaries within said chains between grains growing along lines of equal temperature.

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