Elastic-plastic-brittle transitions of potassium dihydrogen phosphate crystals: characterization by nanoindentation

doi:10.1007/s40436-020-00320-3

Advances in Manufacturing ›› 2020, Vol. 8 ›› Issue (4): 447-456.doi: 10.1007/s40436-020-00320-3

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Elastic-plastic-brittle transitions of potassium dihydrogen phosphate crystals: characterization by nanoindentation

Yong Zhang¹, Ning Hou², Liang-Chi Zhang³, Qi Wang¹

1 School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China;
2 School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang 110136, People's Republic of China;
3 Laboratory for Precision and Nano Processing Technologies, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, NSW 2052, Australia

Received:2020-05-19 Revised:2020-06-07 Published:2020-12-07
Contact: Ning Hou, Liang-Chi Zhang E-mail:13b908074@hit.edu.cn;liangchi.zhang@unsw.edu.au
Supported by:
This work was supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 51875137 and 51905356), the Natural Science Foundation of Heilongjiang Province (Grant No. E2018033), and the Australian Research Council (ARC) (Grant No. DP170100567). The authors thank Weidong Liu and Zhonghuai Wu for calculating the first pop-in event in this study.

Abstract

Abstract: Potassium dihydrogen phosphate (KDP) crystals are widely used in laser ignition facilities as optical switching and frequency conversion components. These crystals are soft, brittle, and sensitive to external conditions (e.g., humidity, temperature, and applied stress). Hence, conventional characterization methods, such as transmission electron microscopy, cannot be used to study the mechanisms of material deformation. Nevertheless, understanding the mechanism of plastic-brittle transition in KDP crystals is important to prevent the fracture damage during the machining process. This study explores the plastic deformation and brittle fracture mechanisms of KDP crystals through nanoindentation experiments and theoretical calculations. The results show that dislocation nucleation and propagation are the main mechanisms of plastic deformation in KDP crystals, and dislocation pileup leads to brittle fracture during nanoindentation. Nanoindentation experiments using various indenters indicate that the external stress fields influence the plastic deformation of KDP crystals, and plastic deformation and brittle fracture are related to the material’s anisotropy. However, the effect of loading rate on the KDP crystal deformation is practically negligible. The results of this research provide important information on reducing machining-induced damage and further improving the optical performance of KDP crystal components.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-020-00320-3

Key words: Potassium dihydrogen phosphate (KDP) crystal, Transition mechanism, Plastic deformation, Brittle fracture

Yong Zhang, Ning Hou, Liang-Chi Zhang, Qi Wang. Elastic-plastic-brittle transitions of potassium dihydrogen phosphate crystals: characterization by nanoindentation[J]. Advances in Manufacturing, 2020, 8(4): 447-456.

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[1]	Yong Zhang, Ning Hou, Liang-Chi Zhang. Understanding the formation mechanism of subsurface damage in potassium dihydrogen phosphate crystals during ultraprecision fly cutting [J]. Advances in Manufacturing, 2019, 7(3): 270-277.
[2]	Tian-Feng Zhou, Ben-Shuai Ruan, Jia Zhou, Xiao-Bin Dong, Zhi-Qiang Liang, Xi-Bin Wang. Mechanism of brittle fracture in diamond turning of microlens array on polymethyl methacrylate [J]. Advances in Manufacturing, 2019, 7(2): 228-237.
[3]	Yong Zhang, Ning Hou, Liang-Chi Zhang. Investigation into the room temperature creep-deformation of potassium dihydrogen phosphate crystals using nanoindentation [J]. Advances in Manufacturing, 2018, 6(4): 376-383.

Elastic-plastic-brittle transitions of potassium dihydrogen phosphate crystals: characterization by nanoindentation

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