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Self-ion irradiation effects on mechanical properties of nanocrystalline zirconium films

Published online by Cambridge University Press:  13 July 2017

Baoming Wang ,
M. A. Haque ,
Vikas Tomar  and
Khalid Hattar
Baoming Wang
Affiliation:
Mechanical and Nuclear Engineering, Penn State University, University Park, PA 16802, USA
M. A. Haque*
Affiliation:
Mechanical and Nuclear Engineering, Penn State University, University Park, PA 16802, USA
Vikas Tomar
Affiliation:
School of Aeronautics & Astronautics, Purdue University, West Lafayette, IN 47907, USA
Khalid Hattar
Affiliation:
Sandia National Laboratories, PO Box 5800, Albuquerque, NM 87185, USA
*
Address all correspondence to M. A. Haque at mah37@psu.edu
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Abstract

Zirconium thin films were irradiated at room temperature with an 800 keV Zr+ beam using a 6 MV HVE Tandem accelerator to 1.36 displacement per atom damage. Freestanding tensile specimens, 100 nm thick and 10 nm grain size, were tested in situ inside a transmission electron microscope. Significant grain growth (>300%), texture evolution, and displacement damage defects were observed. Stress–strain profiles were mostly linear elastic below 20 nm grain size, but above this limit, the samples demonstrated yielding and strain hardening. Experimental results support the hypothesis that grain boundaries in nanocrystalline metals act as very effective defect sinks.

Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 3 , September 2017 , pp. 595 - 600
Copyright
Copyright © Materials Research Society 2017 

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