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US 4,406,709 AGranted
Method of increasing the grain size of polycrystalline materials by directed energy-beams
AssigneeBell Telephone Laboratories, Incorporated
InventorsGeorge K. Celler, Harry J. Leamy, Lee E. Trimble
Life of this patent
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Abstract
Crystal grain size in a material is increased by scanning the material with an appropriately directed energy beam. Short-term oscillation in the scan, and a particular temperature gradient configuration in the wake of the scan, results in growth of large-grain crystallites.
Claims16
A method of forming crystallites in a material comprising
- scanning relatively a directed energy beam across the material with a scanning pattern that has
- (1) a local, higher velocity, short-term, oscillatory motion such that local portions of the material are repetitively heated and allowed to cool, and
- (2) a slower velocity, longer term, motion which results in long-term advance of the beam across the material,
- the scanning pattern resulting in cooler-to-hotter temperature gradients in the wake of the long-term advancing motion which point away from the direction of the long-term advancing motion,
- such that a crystallite grows along the direction of the long-term advancing motion.
2 more elements
Dependencies are inferred from the claim text.