Cyclic nanoindentation studies of HgCdTe epitaxial films
4
Citation
34
Reference
10
Related Paper
Citation Trend
Abstract:
Abstract Hg 1− x Cd x Te ( x ∼0.29) epitaxial films have been subjected to cyclic nanoindentation using spherical indenter from tribological aspects related to the development of polishing process for preparing defect free surface. Different loading/unloading rates of 0.5, 1 and the 4 mNs −1 with a peak load of 10 mN were used for 10 nanoindentation cycles. An open jaw shape was observed in the load-displacement curve for loading/unloading rate of 0.5 mNs −1 , while hysteresis loops were observed for 1 and 4 mNs −1 loading/unloading rates. This phenomenon is explained in light of the regimes of elastic/anelastic deformation and smooth plastic flow. Pop-in during first loading cycle was observed at loading/unloading rates of 1 and 4 mNs −1 , which was attributed to elasto-plastic transition. Multiple pop-in events of low extent were also found in the form of serrations in load-displacement curves for loading/unloading rates of 0.5 and 1 mNs −1 . Based on these observations, the maximum load and minimum loading rate during polishing process for this material has been suggested. The mechanical properties of these films, such as contact stiffness and hardness have been extracted for different loading/unloading rates. The effect of indenter geometry on deformation behaviour using Berkovich indenter is also reported.Keywords:
Hysteresis
For the hardness testing at nano-scale,the load-depth curves are obtained by nanoindention testing machine and real 3-demention morphology images of indentation are obtained by atomic force microscopy.The nanoindentation hardness can be achieved by these curves,images and corresponding calculating method.The nanoindentation hardness values are different because of different calculation and measurement methods.Comparing and analyzing these methods,their advantages and disadvantages are presented,and the future tendency of nanoindentation hardness calculation and measurement methods is presented.
Indentation
Knoop hardness test
Cite
Citations (0)
In this paper, an overview on nanoindentation and its combination with AFM is presented with regard to current instrument technology and applications on dental and bony tissues. Nanoindentation has been a widely used technique to determine the mechanical properties such as nanohardness and Young’s modulus for nanostructured materials. Especially, atomic force microscopy (AFM) combined with nanoindentation, with the pit positions controlled accurately, become a powerful technique used to measure mechanical properties of materials on the nanoscale, and has been applied to the study of biological hard tissues, such as bone and tooth. Examples will be shown that significantly different nanohardness and modulus in the isolated domains within single enamel, the prisms, interprisms, the surrounding sheaths and the different parts of skeletal bone, could been distinguished, while such information was unable to be obtained by traditional methods of mechanical measurements.
Nanomechanics
Cite
Citations (1)
In this paper, the nanoindentation system and atomic force microscope (AFM) are integrated to improve the limitation of the present area function of nanoindentation test used for shallow depth. The projected areas under the shallow contact depth are modified through scanning directly the immediate vinicity of indenter tip. The results indicate that both indentation hardness and reduced modulus obtained from the proposed method are better than those of the present area function as well as the perfect geometry relation.
Indentation
Cite
Citations (4)
Aiming at the belt polishing technology for free-form and conformal optics polishing,the belt polishing equipment was developed and the removal function of belt polishing was studied through theoretical analysis and polishing experiment.Polishing experiments of a K9 sample and a SiC sample were done and results showed that the belt polishing technology had high material remove rate and good surface quality at the same time,and no need pre-polishing in addition.It showed that the belt polishing technology studied here was a promising method in optical fabrication.
Sample (material)
Optical glass
Cite
Citations (0)
Refractory metals
Cite
Citations (28)
Indentation
Cite
Citations (17)
The development and the present situation of nanoindentation instruments are briefly summarized in this paper.The development progress of nanoindentation test in recent years is stated.Then,from aspects of driver,load measuring and displacement measuring,the structures of some representative nanoindentation instruments are introduced and compared.And the integrated technology of nanoindentation instruments is introduced,which includes technology of affecting depth measuring precision,observation,big load module and high temperature testing module.Finally,the future tendency of nanoindentation instruments is presented.
Cite
Citations (0)
Nanoindentation is an important and versatile technique for probing the properties of materials on the nanoscale. There are many factors that may affect nanoindentation measurements. One factor is the added compliance associated with mounting resins used to fix nanoindentation samples in place. We report on the effect of specimen mounting resin compliance on nanoindentation results.
Cite
Citations (8)
Bone tissue
Cite
Citations (45)