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Investigation into the room temperature creep-deformation of potassium dihydrogen phosphate crystals using nanoindentation

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Abstract

It has been a tremendous challenge to manufacture damage-free and smooth surfaces of potassium dihydrogen phosphate (KDP) crystals to meet the requirements of high-energy laser systems. The intrinsic issue is whether a KDP crystal can be plastically deformed so that the material can be removed in a ductile mode during the machining of KDP. This study investigates the room temperature creep-deformation of KDP crystals with the aid of nanoindentation. A stress analysis was carried out to identify the creep mechanism. The results showed that KDP crystals could be plastically deformed at the nano-scale. Dislocation motion is responsible for creep-deformation. Both creep rate and creep depth decrease with decrease in peak force and loading rate. Dislocation nucleation and propagation bring about pop-ins in the load-displacement curves during nanoindentation.

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Acknowledgement

This work was financially sponsored by the National Nature Science Foundation of China (Grant Nos. 51875137 and 51375122), Heilongjiang Natural Science Foundation (Grant No. E2018033) and Australian Research Council (Grant No. DP170100567).

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Authors and Affiliations

  1. School of Mechatronics Engineering, The Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Yong Zhang & Ning Hou

  2. Ministry of Education Key Laboratory of Micro-systems and Micro-structures Manufacturing, The Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Yong Zhang & Ning Hou

  3. Laboratory for Precision and Nano Processing Technologies, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia

    Ning Hou & Liang-Chi Zhang

Authors
  1. Yong Zhang
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  2. Ning Hou
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  3. Liang-Chi Zhang
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Correspondence to Ning Hou or Liang-Chi Zhang.

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Zhang, Y., Hou, N. & Zhang, LC. Investigation into the room temperature creep-deformation of potassium dihydrogen phosphate crystals using nanoindentation. Adv. Manuf. 6, 376–383 (2018). https://doi.org/10.1007/s40436-018-0234-9

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  • DOI: https://doi.org/10.1007/s40436-018-0234-9

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