Time-dependent nanoscale plasticity of ZnO nanorods

Kim, Yong Jae; Lee, Won Woo; Choi, In Chul; Yoo, Byung Gil; Han, Seung Min; Park, Hong Gyu; Park, Won Il; Jang, Jae-il

doi:10.1016/j.actamat.2013.08.022

Cited by 26 publications

(35 citation statements)

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“…The mechanical properties of materials at the nanoscale have generated considerable recent research interest [1][2][3][4][5][6][7]. This is due to the fact that some of these properties can change drastically when the dimensions of the sample decrease towards the atomistic scale.…”

Section: Introductionmentioning

confidence: 99%

“…An interesting approach to this problem was presented by Wo et al [17]. In their work, the sizes of the densely dislocated zone created in Berkovich and cube-corner indents on Ni 3 Al at a range of indentation depths were measured directly from transmission electron microscope micrographs. The expansion of the densely dislocated zone, which they observed, was in a good agreement with the relation proposed by Feng and Nix [12].…”

Section: Introductionmentioning

confidence: 99%

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Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal

et al. 2015

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In the present study, we report a detailed investigation of the unusual size effect in single crystals. For the experiments we specified the hardness in single crystalline copper specimens with different orientations ( (001), (011) and (111)) using Oliver-Pharr method. Our results indicates that with decreasing load, after the value of the hardness reached its maximum, it starts to decrease for very small indentation depths (<150 nm). For the sake of accuracy of hardness determination we have developed two AFM-based methods to evaluate contact area between tip and indented material. The proposed exact measurement of the contact area, which includes the effect of pile-up and sink-in patterns, can partially explain the strange behaviour, however, the decrease of hardness at low loads is still observed. At higher loads range the specified hardness is practically constant.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal

et al. 2015

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“…However, only few researches have been performed on the topic of nanoscale creep behavior of single-crystal ZnO with vertically (0001) orientation. 12,13 It is found that under the uniaxial compressive stress, the nanoscale creep deformation in single-crystal ZnO nanorods is realized via diffusion mechanism. 12 In contrast, the nanoscale creep strain in single-crystal ZnO under nanoindentation is mainly originated from dislocation-dominated mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…12,13 It is found that under the uniaxial compressive stress, the nanoscale creep deformation in single-crystal ZnO nanorods is realized via diffusion mechanism. 12 In contrast, the nanoscale creep strain in single-crystal ZnO under nanoindentation is mainly originated from dislocation-dominated mechanism. 13 It is generally accepted that the diffusion creep rather than the dislocation-dominated creep is the most common creep mechanism in ceramics.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 As being usually fabricated into low-dimensional piezoelectric devices, it is necessary to measure the mechanical properties of singlecrystal ZnO by contact-induced deformation through nanoindentation. [3][4][5][6][7][8][9][10][11][12][13] In this regard, the timedependent (so called creep) behavior is especially important in order to assess its mechanical reliability during devices being on service under long-term stress conditions. However, only few researches have been performed on the topic of nanoscale creep behavior of single-crystal ZnO with vertically (0001) orientation.…”

Section: Introductionmentioning

confidence: 99%

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Nano-scaled diffusional or dislocation creep analysis of single-crystal ZnO

Lin

Chen

et al. 2016

AIP Advances

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The nanoindentation time-dependent creep experiments with different peak loads are conducted on c-plane (0001), a-plane (112¯0) and m-plane (101¯0) of single-crystal ZnO. Under nano-scaled indentation, the creep behavior is crystalline orientation-dependent. For the creep on (0001), the stress exponent at low loads is ∼1 and at high loads ∼4. The stress exponents under all loads are within 3∼7 for the creep on (112¯0) and (101¯0). This means that diffusion mechanism and dislocation mechanism is operative for different planes and loads. The relative difficulty of dislocations activation is an additional factor leading to the occurring of diffusion creep on the c-plane of single-crystal ZnO.

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Understanding Nanoscale Plasticity by Quantitative In Situ Conductive Nanoindentation

2021

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Electronic materials such as semiconductors, piezo‐ and ferroelectrics, and metal oxides are primary constituents in sensing, actuation, nanoelectronics, memory, and energy systems. Although significant progress is evident in understanding the mechanical and electrical properties independently using conventional techniques, simultaneous and quantitative electromechanical characterization at the nanoscale using in situ techniques is scarce. It is essential because coupling/linking electrical signal to the nanoscale plasticity provides vital information regarding the real‐time electromechanical behavior of materials, which is crucial for developing miniaturized smarter technologies. With the advent of conductive nanoindentation, researchers have been able to get valuable insights into the nanoscale plasticity (otherwise not possible by conventional means) in a wide variety of bulk and small‐volume materials, quantify the electromechanical properties, understand the dielectric breakdown phenomenon and the nature of electrical contacts in thin films, etc., by continuously monitoring the real‐time electrical signal changes during any point on the indentation load–hold–unload cycle. This comprehensive Review covers probing the electromechanical behavior of materials using in situ conductive nanoindentation, data analysis methods, the validity of the models and limitations, and electronic conduction mechanisms at the nanocontacts, quantification of resistive components, applications, progress, and existing issues, and provides a futuristic outlook.

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Time-dependent nanoscale plasticity of ZnO nanorods

Cited by 26 publications

References 50 publications

Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal

Decrease of Nano-hardness at Ultra-low Indentation Depths in Copper Single Crystal

Nano-scaled diffusional or dislocation creep analysis of single-crystal ZnO

Understanding Nanoscale Plasticity by Quantitative In Situ Conductive Nanoindentation

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