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Revealing the mechanical properties of potassium dihydrogen phosphate crystals by nanoindentation

Published online by Cambridge University Press:  21 March 2016

Y. Zhang ,
L.C. Zhang ,
M. Liu ,
F.H. Zhang ,
K. Mylvaganam  and
W.D. Liu
Y. Zhang*
Affiliation:
School of Mechatronics Engineering, Harbin Institute of Technology, People's Republic of China; Ministry of Education Key Laboratory of Micro-systems and Micro-structures Manufacturing, Harbin Institute of Technology, People's Republic of China; and Laboratory for Precision and Nano Processing Technologies, The University of New South Wales, New South Wales 2052, Australia
L.C. Zhang*
Affiliation:
Laboratory for Precision and Nano Processing Technologies, The University of New South Wales, New South Wales 2052, Australia
M. Liu
Affiliation:
Laboratory for Precision and Nano Processing Technologies, The University of New South Wales, New South Wales 2052, Australia
F.H. Zhang*
Affiliation:
School of Mechatronics Engineering, Harbin Institute of Technology, People's Republic of China
K. Mylvaganam
Affiliation:
Laboratory for Precision and Nano Processing Technologies, The University of New South Wales, New South Wales 2052, Australia
W.D. Liu
Affiliation:
Laboratory for Precision and Nano Processing Technologies, The University of New South Wales, New South Wales 2052, Australia
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Potassium dihydrogen phosphate (KDP) is an important nonlinear optical crystal material for light frequency converters and Pockels photoelectric switches in laser systems. However, KDP is apt to fracture, is deliquescent, and can suffer from microstructural changes under a temperature variation. As such, KDP has been one of the most difficult-to-handle materials, but its properties have not been well understood. This paper aims to explore the mechanical properties of KDP crystals in detail with the aid of the nanoindentation technique using a Berkovich diamond indenter. It was found that the mechanical properties of KDP can be easily altered by machining-induced subsurface damage. It was also discovered that a KDP crystal is a visco-elasto-plastic material during micro/nanoscale deformation, although it is very brittle macroscopically.

Keywords

crystalmachiningnano-indentation
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 8 , 28 April 2016 , pp. 1056 - 1064
Copyright
Copyright © Materials Research Society 2016 

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