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Title: Preferential nucleation during polymorphic transformations

Abstract

Polymorphism is the ability of a solid material to exist in more than one phase or crystal structure. Polymorphism may occur in metals, alloys, ceramics, minerals, polymers, and pharmaceutical substances. Unresolved are the conditions for preferential nucleation during polymorphic transformations in which structural relationships or special crystallographic orientation relationships (OR’s) form between the nucleus and surrounding matrix grains. We measured in-situ and simultaneously the nucleation rates of grains that have zero, one, two, three and four special OR’s with the surrounding parent grains. These experiments show a trend in which the activation energy for nucleation becomes smaller – and therefore nucleation more probable - with increasing number of special OR’s. As a result, these insights contribute to steering the processing of polymorphic materials with tailored properties, since preferential nucleation affects which crystal structure forms, the average grain size and texture of the material, and thereby - to a large extent - the final properties of the material.

Authors:
 [1];  [2];  [2]
  1. Delft Univ. of Technology, Mekelweg (Netherlands); Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Delft Univ. of Technology, Mekelweg (Netherlands)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Netherlands Organisation for Scientific Research (NWO); USDOE
OSTI Identifier:
1340284
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; metals and alloys; pharmaceutics; solid-state chemistry; structural geology

Citation Formats

Sharma, H., Sietsma, J., and Offerman, S. E. Preferential nucleation during polymorphic transformations. United States: N. p., 2016. Web. doi:10.1038/srep30860.
Sharma, H., Sietsma, J., & Offerman, S. E. Preferential nucleation during polymorphic transformations. United States. doi:10.1038/srep30860.
Sharma, H., Sietsma, J., and Offerman, S. E. Wed . "Preferential nucleation during polymorphic transformations". United States. doi:10.1038/srep30860. https://www.osti.gov/servlets/purl/1340284.
@article{osti_1340284,
title = {Preferential nucleation during polymorphic transformations},
author = {Sharma, H. and Sietsma, J. and Offerman, S. E.},
abstractNote = {Polymorphism is the ability of a solid material to exist in more than one phase or crystal structure. Polymorphism may occur in metals, alloys, ceramics, minerals, polymers, and pharmaceutical substances. Unresolved are the conditions for preferential nucleation during polymorphic transformations in which structural relationships or special crystallographic orientation relationships (OR’s) form between the nucleus and surrounding matrix grains. We measured in-situ and simultaneously the nucleation rates of grains that have zero, one, two, three and four special OR’s with the surrounding parent grains. These experiments show a trend in which the activation energy for nucleation becomes smaller – and therefore nucleation more probable - with increasing number of special OR’s. As a result, these insights contribute to steering the processing of polymorphic materials with tailored properties, since preferential nucleation affects which crystal structure forms, the average grain size and texture of the material, and thereby - to a large extent - the final properties of the material.},
doi = {10.1038/srep30860},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {Wed Aug 03 00:00:00 EDT 2016},
month = {Wed Aug 03 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

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Cited by: 1 work
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