硫系玻璃力学特性的纳米压痕与划痕实验研究  

Experimental Study on Mechanical Properties of Chalcogenide Glass byNanoindentation and Scratch

作　　者：刘治 张宇[1] 陈春梅 谢康 陈龙 周慎敏 Liu Zhi;Zhang Yu;Chen Chunmei;Xie Kang;Chen Long;Zhou Shenmin(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China)

机构地区：[1]昆明理工大学机电工程学院,云南昆明650500

出　　处：《激光与光电子学进展》2023年第21期243-249,共7页Laser & Optoelectronics Progress

摘　　要：硫系玻璃是热成像系统元件的重要材料,虽然适合成型,但这些脆性材料的加工特性在很大程度上是未知的。因此为了解硫系玻璃的微观变形机理,采用纳米压痕仪对硫系玻璃进行压痕实验、变载划痕实验和恒载划痕实验。纳米压痕实验中获得的数据表明,硫系玻璃在压痕的过程中出现了不连续阶梯状(pop-in)现象,从而表明材料发生了弹塑性转变,并得出材料的弹性模量和硬度;通过对压痕后的形貌进行观察,发现有边缘存在材料堆积现象,这将使通过OliverPharr方法计算得出的弹性模量和硬度偏大,因此需要使用半椭圆模型进行校正。通过变载划痕实验得出划痕深度-长度曲线图,分析了硫系玻璃在每种阶段的去除方式,得出了脆塑转变的临界载荷为92.3 mN;通过对恒载划痕实验数据进行分析,得出脆塑转变的临界载荷为50~120 mN,证实了变载划痕实验所得临界载荷的准确性。Chalcogenide glass is a critical material for thermal imaging systems.Although chalcogenide glass is suitable for molding,the processing characteristics of this brittle material have not yet been thoroughly analyzed.To evaluate the micro-deformation mechanism of chalcogenide glass,a nanoindenter was used to perform indentation,variable-load scratch,and constant-load scratch tests.The experimental data reveal that the discontinuous stepped(pop-in)phenomenon occurs during indentation,indicating that chalcogenide glass undergoes elastic-plastic transformation.Furthermore,the elastic modulus and hardness of chalcogenide glass samples were determined.Upon observing sample morphology after indentation,it is determined that material accumulates at the sample edges.This causes the elastic modulus and hardness calculated using the Oliver-Pharr method to be higher than the experimental values.Therefore a semi-elliptical model should be used to correct the deviations.The depth-length curve for scratch depth was obtained by performing a variableload scratch experiment.Furthermore,the removal methods of chalcogenide glass during each stage were analyzed.The critical load of brittle-plastic transition is 92.3 mN.Analysis of the scratch test data under a constant load reveals that the critical load of brittle-plastic transition ranges between 50 and 120 mN.This demonstrates the accuracy of the critical load determined using the scratch test under a variable load.

关 键 词：材料 硫系玻璃 纳米压痕 脆塑转变 变载划痕实验 恒载划痕实验 

分 类 号：O484[理学—固体物理]