Non-linear dynamics and pattern selection at the crystal-melt interface. Final report, September 1, 1984--February 28, 1998 | Zendy

H. Z. Cummins | Zendy

Open Access

Non-linear dynamics and pattern selection at the crystal-melt interface. Final report, September 1, 1984--February 28, 1998

Author(s) -

H. Z. Cummins

Publication year - 1998

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/661605

Subject(s) - succinonitrile , materials science , microstructure , pattern formation , alloy , laser , crystal (programming language) , thermal stability , directional solidification , thermal , crystallography , optics , composite material , chemistry , thermodynamics , physics , computer science , organic chemistry , electrode , biology , electrolyte , genetics , programming language

Pattern formation at the solidifying crystal-melt interface was investigated with a model binary alloy system of the molecular crystal succinonitrile doped with the laser dye Coumarin 152. Videomicroscopy and computerized digital image analysis provided detailed data for quantitative comparison with theoretical predictions. Application of a single localized laser pulse or a row of UV spots to the interface during solidification allowed for direct measurements of pattern stability. These thermal perturbations also resulted in dramatic modifications of the observed solidification patterns, suggesting that the controlled thermal perturbation approach may allow the microstructure of metallic alloys to be controlled during solidification

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