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The mechanical properties of as-grown noncubic organic molecular crystals assessed by nanoindentation

Published online by Cambridge University Press:  19 June 2017

Matthew R. Taw ,
John D. Yeager ,
Daniel E. Hooks ,
Teresa M. Carvajal  and
David F. Bahr
Matthew R. Taw
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
John D. Yeager
Affiliation:
Explosive Science and Shock Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Daniel E. Hooks
Affiliation:
Explosive Science and Shock Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Teresa M. Carvajal
Affiliation:
School of Agricultural and Biological Engineering, Purdue University, West Lafayette, Indiana 47907, USA
David F. Bahr*
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
*
a) Address all correspondence to this author. e-mail: dfbahr@purdue.edu
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Abstract

Organic molecular crystals are often noncubic and contain significant steric hindrance within their structure to resist dislocation motion. Plastic deformation in these systems can be imparted during processing (tableting and comminution of powders), and the defect density impacts subsequent properties and performance. This study measured the elastic and plastic properties of representative monoclinic, orthorhombic, and triclinic molecular crystalline structures using nanoindentation of as-grown sub-mm single crystals. The variation in modulus due to in-plane rotational orientation, relative to a Berkovich tip, was approximately equal to the variation of a given crystal at a fixed orientation. The onset of plasticity occurs consistently at shear stresses between 1 and 5% of the elastic modulus in all three crystal systems, and the hardness to modulus ratio suggests conventional Berkovich tips do not generate fully self-similar plastic zones in these materials. This provides guidance for mechanical models of tableting, machining, and property assessment of molecular crystals.

Keywords

strengthnano-indentationelastic properties
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 14 , 28 July 2017 , pp. 2728 - 2737
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Linda S. Schadler

References

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