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

Lin, P. H.; Du, X.H.; Chen, Y. H.; Chen, H. C.; Huang, J.C.

doi:10.1063/1.4964357

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…Another recent application has been to investigate the strain hardening surrounding larger Rockwell indentations made in electrodeposited nanocrystalline nickel material with different grain sizes [40]. Additional examples include (1) investigating shear banding in metallic glass materials [41]; and, nano-probing of diffusion-controlled deformation on a copper crystal surface [42] and on different surfaces of ZnO crystals [43].…”

Section: Hardness As a Test Probementioning

confidence: 99%

Crystal Indentation Hardness

2017

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Abstract:There is expanded interest in the long-standing subject of the hardness properties of materials. A major part of such interest is due to the advent of nanoindentation hardness testing systems which have made available orders of magnitude increases in load and displacement measuring capabilities achieved in a continuously recorded test procedure. The new results have been smoothly merged with other advances in conventional hardness testing and with parallel developments in improved model descriptions of both elastic contact mechanics and dislocation mechanisms operative in the understanding of crystal plasticity and fracturing behaviors. No crystal is either too soft or too hard to prevent the determination of its elastic, plastic and cracking properties under a suitable probing indenter. A sampling of the wealth of measurements and reported analyses associated with the topic on a wide variety of materials are presented in the current Special Issue.

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Section: Hardness As a Test Probementioning

confidence: 99%

Crystal Indentation Hardness

2017

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“…Kucheyev et al studied the deformation behavior of a c-plane (0001) ZnO single crystal by nanoindentation at the micro-scale indentation depth of about 1000 nm, and found that the elastic–plastic-deformation transition threshold depends on the loading rate, with faster loading resulting in a larger threshold [ 35 ]. Lin et al studied the creep behavior with different loading rates on c-plane (0001), a-plane (

) and m-plane (

) ZnO single crystals by nanoindentation experiments, and found that the creep displacements increased with the increasing loading rate [ 36 ]. Fang et al studied the effect of strain rate on the hardness and Young’s modulus of ZnO thin films by nanoindentation [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Strain Rate on Nano-Scale Mechanical Behavior of A-Plane (112¯0) ZnO Single Crystal by Nanoindentation

Zhu

Zhang

et al. 2023

Micromachines

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In this study, nanoindentation tests at three different strain rates within 100 nm indentation depth were conducted on an a-plane (112¯0) ZnO single crystal to investigate the effect of strain rate on its nano-scale mechanical behavior. The load–indentation-depth curves, pop-in events, hardness and Young’s moduli of an a-plane (112¯0) ZnO single crystal at different strain rates were investigated at the nano-scale level. The results indicated that, with the indentation depth increasing, the load increased gradually at each maximum indentation depth, hma, during the loading process. A distinct pop-in event occurred on each loading curve except that corresponding to the hmax of 10 nm. The applied load at the same indentation depth increased with the increasing strain rate during the nanoindentation of the a-plane (112¯0) ZnO single crystal. The higher strain rate deferred the pop-in event to a higher load and deeper indentation depth, and made the pop-in extension width larger. The hardness showed reverse indentation size effect (ISE) before the pop-in, and exhibited normal ISE after the pop-in. Both the hardness and the Young’s modulus of the a-plane (112¯0) ZnO single crystal increased with the increasing strain rate, exhibiting the positive strain-rate sensitivity.

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“…The mechanical reliability will determine the long-term stability and performance for many of the nanodevices [23]. Lin et al [34] investigated the nanoscale creep behavior of single-crystal ZnO because it is usually fabricated into low-dimensional piezoelectric devices. They found that creep strain is mainly controlled by the interfacial diffusion between the nanoindenter tip and the test sample.…”

Section: Introductionmentioning

confidence: 99%

Vickers microhardness and indentation creep studies for erbium-doped ZnO nanoparticles

2019

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The effect of erbium (Er) doping on the structural, magnetic and mechanical properties of Zn 1−x Er x O, with 0.00 ≤ x ≤ 0.10, samples was studied using X-ray powder diffraction, M-H magnetic hysteresis and digital Vickers microhardness tester, respectively. The samples were prepared by wet chemical co-precipitation method. Vickers microhardness (H v) measurements were carried out at different applied loads (0.25-10 N) and dwell times (t = 10-60 s) to study the mechanical performance of the samples. Experimental results of H v were analyzed using Meyer's law, and modeled according to Hays-Kendall, elastic/plastic deformation, modified proportional specimen resistance (MPSR) and Indentation Induced Cracking models. It was observed that the MPSR model was the most appropriate model for describing the load independent microhardness data of Er-doped ZnO nanoparticle samples. Indentation creep behavior of Zn 1−x Er x O samples was studied at room temperature by measuring the variation of H v with the dwell times (t = 10-60 s) at fixed applied loads F = 1, 5 and 10 N, respectively. The results showed that Er-doped ZnO nanoparticles samples possessed grain boundary sliding and dislocation climbs at low loads followed by dislocation creep for higher loads within the operative creep mechanism.

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

Cited by 6 publications

References 22 publications

Crystal Indentation Hardness

Crystal Indentation Hardness

Effect of Strain Rate on Nano-Scale Mechanical Behavior of A-Plane (112¯0) ZnO Single Crystal by Nanoindentation

Vickers microhardness and indentation creep studies for erbium-doped ZnO nanoparticles

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