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Related Experiment Videos

Orientation selection in dendritic evolution.

Tomorr Haxhimali¹, Alain Karma, Frédéric Gonzales

¹Department of Physics and Center for Interdisciplinary Research on Complex Systems, Northeastern University, Boston, Massachusetts 02115, USA.

Nature Materials

|July 18, 2006

Summary

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Dendritic crystal growth is more diverse than expected. Primary dendrite growth directions can continuously change, impacting alloy microstructure control.

Area of Science:

Materials Science
Crystallography
Solidification Science

Background:

Dendritic crystal growth patterns exhibit hierarchical structures, typically along principal crystallographic axes.
Atypical growth directions have been observed, suggesting a broader range of possibilities.

Purpose of the Study:

To investigate the full range of possible dendrite growth directions.
To demonstrate that primary dendrite growth directions can vary continuously.
To explore the implications for morphological diversity and alloy microstructure control.

Main Methods:

Phase-field simulations of equiaxed dendritic growth.
Experimental directional freezing of Aluminum-Zinc (Al-Zn) alloys.

Main Results:

Related Experiment Videos

Demonstrated continuous variation of primary dendrite growth directions between crystallographic axes (<100> to <110>).
Observed this continuous change as a function of composition-dependent anisotropy parameters.
Validated computational findings with experimental results in Al-Zn alloys.

Conclusions:

The morphological diversity of dendritic structures is significantly richer than previously anticipated.
Continuous variation in growth direction offers new avenues for controlling alloy microstructures.
Findings are crucial for optimizing the solidification of cast alloys exhibiting dendritic growth.