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

Journal Article · · Journal of Materials Research
DOI:https://doi.org/10.1557/jmr.2017.219· OSTI ID:1369202
 [1];  [2];  [2];  [3];  [1]
  1. Purdue Univ., West Lafayette, IN (United States). School of Materials Engineering
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Purdue Univ., West Lafayette, IN (United States). School of Agricultural and Biological Engineering

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 paper 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. Finally, this provides guidance for mechanical models of tableting, machining, and property assessment of molecular crystals.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); US Air Force Office of Scientific Research (AFOSR)
Grant/Contract Number:
AC52-06NA25396; FA9550-16-1-0101
OSTI ID:
1369202
Report Number(s):
LA-UR-17-21569
Journal Information:
Journal of Materials Research, Vol. 32, Issue 14; ISSN 0884-2914
Publisher:
Materials Research SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Non-Schmid effect of pressure on plastic deformation in molecular crystal HMX journal June 2019
The effect of crystal anisotropy and plastic response on the dynamic fracture of energetic materials journal October 2019
Dislocations in molecular crystals journal July 2018
Indentation fracture behavior of energetic and inert molecular crystals journal November 2019