Material removal mechanisms and characteristics of potassium dihydrogen phosphate crystals under nanoscratching

doi:10.1007/s40436-021-00356-z

Advances in Manufacturing ›› 2021, Vol. 9 ›› Issue (4): 558-567.doi: 10.1007/s40436-021-00356-z

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Material removal mechanisms and characteristics of potassium dihydrogen phosphate crystals under nanoscratching

Ning Hou^1,2, Yong Zhang³, Liang-Chi Zhang⁴, Ming-Hai Wang¹

1 School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang 110136, People's Republic of China;
2 Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, People's Republic of China;
3 School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China;
4 Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, Guangdong, People's Republic of China

Received:2021-01-07 Revised:2021-03-18 Published:2021-11-12
Contact: Yong Zhang, Liang-Chi Zhang E-mail:hit_zy@hit.edu.cn;zhanglc@sustech.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 51905356 and 51875137), the Doctoral Startup Foundation of Liaoning Province (Grant No. 2020-BS-178), the Open Foundation of the Key Laboratory of Fundamental Science for the National Defense of Aeronautical Digital Manufacturing Process of Shenyang Aerospace University (Grant No. SHSYS202002), and the Specific Discipline of Guangdong Province (Grant No. 2020ZDZX2006).

Abstract

Abstract: Potassium dihydrogen phosphate (KDP) crystals are important materials in high-energy laser systems. However, because these crystals are brittle and soft, machining-induced defects often emerge in KDP components. This study aimed to investigate the material removal mechanisms and characteristics of KDP during nanoscratching using Berkovich, spherical, and conical indenters. We found that KDP surface layers could be removed in a ductile mode at the micro/nanoscale and that dislocation motion was one of the main removal mechanisms. Removal characteristics are related to the stress fields generated by indenter geometries. The spherical indenter achieved a ductile removal mode more easily. The lateral force of nanoscratching increased with an increase in the normal force. The coefficient of friction (COF) followed the same trend as the lateral force when spherical and conical indenters were used. However, the COF was independent of the normal force when using a Berkovich indenter. We found that these COF variations could be accurately described by friction models.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-021-00356-z

Key words: Potassium dihydrogen phosphate (KDP) crystals, Removal mechanism, Nanoscratching, Indenter geometry

Ning Hou, Yong Zhang, Liang-Chi Zhang, Ming-Hai Wang. Material removal mechanisms and characteristics of potassium dihydrogen phosphate crystals under nanoscratching[J]. Advances in Manufacturing, 2021, 9(4): 558-567.

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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]	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.

Material removal mechanisms and characteristics of potassium dihydrogen phosphate crystals under nanoscratching

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