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Investigation into the room temperature creep-deformation of potassium dihydrogen phosphate crystals using nanoindentation |
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| Authors: | Yong Zhang Ning Hou Liang-Chi Zhang |
| Affiliation: | 1.School of Mechatronics Engineering, The Harbin Institute of Technology, Harbin 150001, People's Republic of China;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;3.Laboratory for Precision and Nano Processing Technologies, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, NSW 2052, Australia |
| 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 nanoscale. 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 loaddisplacement curves during nanoindentation.The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-018-0234-9 |
| Keywords: | Potassium dihydrogen phosphate (KDP) crystals Creep-deformation Stress Dislocation |
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