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Preferential Nucleation during Polymorphic Transformations.

H Sharma1, J Sietsma1, S E Offerman1

  • 1Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands.

Scientific Reports
|August 4, 2016
PubMed
Summary
This summary is machine-generated.

Understanding polymorphic transformations is key for materials science. This study reveals that materials with more special crystallographic orientation relationships (ORs) between nucleus and matrix grains exhibit more probable nucleation, enabling tailored material properties.

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Area of Science:

  • Materials Science
  • Crystallography
  • Solid-State Physics

Background:

  • Polymorphism, the ability of a solid to exist in multiple crystal structures, is crucial in various materials.
  • Preferential nucleation during polymorphic transformations, influenced by crystallographic orientation relationships (ORs), remains poorly understood.
  • Controlling nucleation is vital for tailoring material properties.

Purpose of the Study:

  • To investigate the relationship between special crystallographic orientation relationships (ORs) and nucleation rates during polymorphic transformations.
  • To quantify how the number of special ORs affects the probability of nucleation.
  • To provide insights for controlling material processing and properties.

Main Methods:

  • In-situ measurement of nucleation rates.
  • Simultaneous quantification of grains with varying numbers of special ORs (0 to 4) relative to parent grains.
  • Analysis of activation energy for nucleation.

Main Results:

  • A clear trend was observed: nucleation probability increases as the number of special ORs increases.
  • The activation energy for nucleation decreases with a higher number of special ORs.
  • This indicates that special ORs significantly influence preferential nucleation.

Conclusions:

  • The number of special crystallographic orientation relationships directly correlates with nucleation probability during polymorphic transformations.
  • These findings offer a pathway to steer material processing for desired properties by controlling nucleation.
  • Understanding ORs is essential for designing materials with specific crystal structures, grain sizes, and textures.