Elastic-plastic-brittle transitions of potassium dihydrogen phosphate crystals: characterization by nanoindentation
Elastic-plastic-brittle transitions of potassium dihydrogen phosphate crystals: characterization by nanoindentation
复制标题
磷酸二氢钾晶体的弹塑性脆转变：纳米压痕表征
DOI：
10.1007/s40436-020-00320-3
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发表时间：
2020-09
影响因子：
5.2
通讯作者：
Wang Qi
中科院分区：
文献类型：
--
作者：
Zhang Yong;Hou Ning;Zhang Liang-Chi;Wang Qi
磷酸二氢钾（KDP）晶体作为光开关和频率转换元件广泛应用于激光点火装置中。这些晶体是软的、脆的，并且对外部条件敏感（例如，湿度、温度和施加的应力）。因此，传统的表征方法，如透射电子显微镜，不能用于研究材料变形的机制。然而，了解KDP晶体的塑性-脆性转变机制对于防止加工过程中的断裂损伤具有重要意义。本研究透过奈米压痕实验与理论计算，探讨KDP晶体的塑性变形与脆断机制。结果表明，位错形核和扩展是KDP晶体塑性变形的主要机制，纳米压痕过程中位错堆积导致脆性断裂。不同压头下的纳米压痕实验表明，外部应力场影响KDP晶体的塑性变形，塑性变形和脆性断裂与材料的各向异性有关。然而，加载速率对KDP晶体变形的影响几乎可以忽略不计。研究结果为减少KDP晶体器件的加工损伤，进一步提高器件的光学性能提供了重要的参考。
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.
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DOI：
--
发表时间：
2012
期刊：
Journal of Synthetic Crystals
影响因子：
--
作者：
Zhang Jianfu
通讯作者：
Zhang Jianfu
影响因子：
--
作者：
Lijie Zhang
通讯作者：
Lijie Zhang
DOI：
10.4028/www.scientific.net/msf.773-774.705
发表时间：
2013-11
期刊：
Materials Science Forum
影响因子：
--
作者：
Jing-Rui Peng;Liangchi Zhang;Xinchun Lu
通讯作者：
Jing-Rui Peng;Liangchi Zhang;Xinchun Lu
影响因子：
3
作者：
N. Rajesh;V. Kannan;P. Raghavan;P. Ramasamy;C. Lan
通讯作者：
N. Rajesh;V. Kannan;P. Raghavan;P. Ramasamy;C. Lan
影响因子：
4.4
作者：
D. Hwang;Moo-Jin Park;Changhee Lee
通讯作者：
D. Hwang;Moo-Jin Park;Changhee Lee