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Effect of hydrogen and strain rate on nanoindentation

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Yakai Zhao - Research Fellow - Nanyang Technological

The influence of hydrogen on the plastic deformation of nanocrystalline nickel was analysed by recourse to nanoindentation on the uncharged and hydrogen-charged samples.It was revealed that,in nanocrystalline Ni,hydrogen significantly decreases hardness but does not alter the strain rateYakai Zhao - LinkedInThe influence of hydrogen on the plastic deformation of nanocrystalline nickel was analysed by recourse to nanoindentation on the uncharged and hydrogen-charged samples.It was revealed that,in nanocrystalline Ni,hydrogen significantly decreases hardness but does not alter the strain rateUnveiling the Effects of Interchain Hydrogen Bonds on The stress-strain plots were obtained with a constant ramp applied force (0.005 N/min),and the displacement and applied force were measured independently.4.5.Nanoindentation Tests.Nanoindentation measurements were recorded on Brukers Hysitron TI Premier Nanomechanical Test Instrument with a Berkovitch diamond indenter.

Title Research Fellow at NanyangLocation SingaporeConnections 71Nanoindentation of palladium - hydride;

nanoindentation had been used to track the mechanical effects of hydrogen on palladium foils over a range of hydrogen concentrations. at the pyramid top of 230nm at a constant strain rate of 0.05s-1 and a maximum insertion depth of 2000nm.The resolution of G200Title Ph.D.at Hanyang UniversityLocation Hydrogen embrittlement of tungsten induced byHydrogen exposure has been found to result in metal embrittlement.In this work,we use nanoindentation to study the mechanical properties of polycrystalline tungsten subjected to deuterium plasma exposure.For the purpose of comparison,nanoindentation tests on exposed and unexposed reference tungsten were carried out.Thickness-Dependent Strain Rate Sensitivity of Nanolayers Unlike the previous methods,this special nanoindentation creep method alleviates thermal drift by first applying the highest strain rates and then the lowest strain rates.However,during the strain-rate-jump test,the indentation depths must be greater than 500 nm for reliable determination of SRS.

Techniques for investigation of hydrogen embrittlement of

Apr 12,2018 Effect of hydrogen and strain rate on nanoindentation#0183;Techniques such as slow strain rate testing,constant load testing,EPT,SKP and SKPFM have already been used to study the effect of hydrogen entered under atmospheric exposure conditions.Nanoindentation,HMT,TDS,Ag decoration or SIMS can be also carried out after atmospheric exposure.THE EFFECT OF HYDROGEN ON THE DEFORMATIONsignificant effect of hydrogen on the strain-rate hardening or the plastic anisotropy of the plate material.The results of this study suggest that the small effects of hydrogen on the deformation behavior of Zircaloy-4 are caused by dislocations which form upon hydrideStress-dependent hardening-to-softening transition of Electrochemical hydrogen charging was performed at room temperature with a potentiostat (HA-151A,Hokuto Denko,Tokyo,Japan) using a 0.25 g/L As 2O 3 in a 1 N H 2SO 4 Fig.1 e Inuence of indenter angle on the nanoindentation results (obtained under an indentation strain rate of 0.05/ s); (a) typical load-displacement curves conducted at P

Stress-Dependent Hardening-to-Softening Transition of

The behavior of hydrogen-induced hardening of 310S and 304 austenitic stainless steels was investigated by using nanoindentation constant strain rate (CSR) and strain rate jump tests.Hydrogen Strain localization in a nanocrystalline metal Atomic strain rate while keeping zero stress on the other axes.Strain rates (e_ Effect of hydrogen and strain rate on nanoindentation#222; between 5 107 s 1and 5 109 s were used and the temperature was held constant during testing with a Nose-Hoover thermostat.Yield strength was measured by taking the 1% offset yield stress following prior work from Brandstetter et al.30 and Vo et al.31 Crystal defects wereSize Effects of Hardness and Strain Rate Sensitivity in Feb 03,2020 Effect of hydrogen and strain rate on nanoindentation#0183;Nanoindentation was performed by the nanoindentation tester equipped with a three-sided pyramidal diamond Berkovichs indenter.In order to determine SRS,indentations with different loading rates were performed 0.1,1,10,100 mN/min.Size effects were studied by application of maximum indentation loads in the range from 1 up to 5 mN (penetrating up to approximately one-third

Previous123456NextNanoindentation of palladium - hydride;

nanoindentation had been used to track the mechanical effects of hydrogen on palladium foils over a range of hydrogen concentrations. at the pyramid top of 230nm at a constant strain rate of 0.05s-1 and a maximum insertion depth of 2000nm.The resolution of G200Nanoindentation and the indentation size effect Kinetics A study of the indentation size effect (ISE) in aluminum and alpha brass is presented.The study employs rate effects to examine the fundamental mechanisms responsible for the ISE.These rate effects are characterized in terms of the rate sensitivity of the hardness,H/ ln eff ,where H is the hardness and eff Effect of hydrogen and strain rate on nanoindentationgt; is an effective strain rate in the plastic volume beneath the

Nanoindentation and strain rate effects on hardness of

Due to the addition of alloying elements Ag and Cu in SAC387,nanoindentation results at strain rates from 0.01/s to 1.0/s have shown consistently superior mechanical strength as compared to Pure Sn.However,at strain rate of 10.0/s,it was also found that SAC387 and Pure Sn show similar hardness and yield stress values of approximately 0.6MPa.Nanoindentation and nanofriction on DLC filmsmeasured by nanoindentation with a Berkovich tip with maximum load of 100 mN,and by applying the load exponentially versus time,in order to maintain a constant strain rate during indentation.The evolution of hardness,studied for strain rates between 0.003 and 0.3 s-1,Micromachines Free Full-Text The Impact of Hydrogen on Another important advantage is that the top surface is not affected by corrosion by the electrolyte.The nanoindentation results show that hydrogen reduces the activation energy for homogenous dislocation nucleation by approximately 1520% in a (001) grain.The elastic modulus also was observed to be reduced by the same amount.

Micromachines Free Full-Text Calibration of a

Obviously,the strain rates in the tensile and nanoindentation experiments in this study are different,so the strain rate effect is evaluated with further enrichment to unify the constitutive behavior,as shown in Equations (5) and (6) by multiplying the rate factors and nIon-Irradiation Effect on Strain Rate Sensitivity of The local strain rate (LSR) dependence of nanoindentation (NI) hardness was investigated by using standard constant strain rate (CSR) test method and strain rate jump (SRJ) test method for W single crystal with the surface orientation of {001} before and after 6.4 MeV Fe3+ irradia-tions (nominal damage level of 0.1,1 and 2 dpa,573 K).Ion-Irradiation Effect on Strain Rate Sensitivity of The local strain rate (LSR) dependence of nanoindentation (NI) hardness was investigated by using standard constant strain rate (CSR) test method and strain rate jump (SRJ) test method for W single crystal with the surface orientation of {001} before and after 6.4 MeV Fe3+ irradia-tions (nominal damage level of 0.1,1 and 2 dpa,573 K).

In situ nanoindentation during electrochemical hydrogen

Jan 27,2021 Effect of hydrogen and strain rate on nanoindentation#0183;The effects of hydrogen in metals are a pressing issue causing severe economic losses due to material deterioration by hydrogen embrittlement.A crucial understanding of the interactions of hydrogen with different microstructure features can be reached by nanoindentation due to the small volumes probed.Even more,in situ testing while charging the sample with hydrogen prevents theHydrogen-induced softening in nanocrystalline Ni The influence of hydrogen on the plastic deformation of nanocrystalline nickel was analysed by recourse to nanoindentation on the uncharged and hydrogen-charged samples.It was revealed that,in nanocrystalline Ni,hydrogen significantly decreases hardness but does not alter the strain rateHydrogen embrittlement in metallic nanowires Nature May 01,2019 Effect of hydrogen and strain rate on nanoindentation#0183;The effect of hydrogen embrittlement on metal nanostructures is still unclear. Detailed discussions of the strain rate and temperature effects are nucleation under nanoindentation,the

Hydrogen Effects on Localized Plasticity in SUS310S

The effect of hydrogen on the localized plasticity of an industrial material,SUS310S stainless steel,has been investigated using a combination of nanoindentation and atomic force microscopy (AFM).The load versus displacement curves show that 73.4wt.ppmHydrogen Effect on the Deformation Behavior of Austenitic It is first found by using nanoindentation continuous stiffness measurement that hydrogen decreases the elastic modulus and increases the hardness in the initial stage of plastic deformation,whileHigh-strain-rate nanoindentation behavior of fine-grained The effects of temperature and alloying elements on deformation in the high-strain-rate regime were investigated by testing fine-grained magnesium alloys with an average grain size of 2 3 m by a nanoindentation technique.

Fracture transitions in iron Strain rate and

In the hydrogen-free samples,average strain rate varied by four orders of magnitude.DBTT shifts are experimentally found and predicted to increase 100 K or more with either increasing strain rate or exposure to hydrogen.Electrochemical Nanoindentation Study on Influence of A nanoindentation apparatus with an electrochemical cell for cathodic hydrogen charging and a wide dynamic range of load duration time was developed,and influence of hydrogen on local mechanical properties of Type 316L stainless steel,pure Ni,and three kinds of NiCr bialloy (56Ni-43Cr,69Ni-30Cr,79Ni-20Cr) was investigated.Effects of hydrogen on the nanomechanical properties of a The effect of strain rates on super-plastic deformation behaviors in the BMG under uniaxial compression was systematically studied within a strain rate range from 4.2 Effect of hydrogen and strain rate on nanoindentation#215; 104 s1 to 6.0 Effect of hydrogen and strain rate on nanoindentation#215; 10

Effect of the Conditions of Dynamic Nanoindentation on

Effect of the Conditions of Dynamic Nanoindentation on the Strain-Rate Sensitivity of Hardness for Solids with Different Structures Golovin,Yu.I.Abstract.Publication Journal of Technical Physics.Pub Date 2005 DOI 10.1134/1.1901788 Bibcode Effect of hydrogen and strain rate on nanoindentation Jan 08,2019 Effect of hydrogen and strain rate on nanoindentation#0183;The effect of hydrogen and strain rate on nanoindentation creep of austenitic stainless steel was investigated by nanoindentation loading and creep tests.The loading segment mainly reflects dislocation nucleation,but creep mainly indicates dislocation movement.Effect of Hydrogen and Strain Rate on Superduplex Steel -The work indicates an effect of strain rate at a very low hydrogen content of 1ppm,suggesting an effect of low temperature creep,in addition to that of hydrogen.1.Introduction.Ferritic-austenitic stainless steels undergo time-dependent plastic strain ('low temperature creep') at stresses above about 80% of the 0.2% proof stress.

Cited by 9Publish Year 2016Author L.Tian,Z.M.Jiao,G.Z.Yuan,S.G.Ma,Z.H.Wang,H.J.Yang,Y.Zhang,J.W.QiaoEffect of nitrogen on nanomechanical behavior of

Effect of hydrogen and strain rate on nanoindentation creep of austenitic stainless steel November 2018 International Journal of Hydrogen Energy Yuanjian HongCited by 7Publish Year 2019Author Yuanjian Hong,Chengshuang Zhou,Yuanyuan Zheng,Lin Zhang,Jinyang Zheng,Xingyang ChenEffect of hydrogen and strain rate on nanoindentation The effect of hydrogen and strain rate on nanoindentation creep of austenitic stainless steel was investigated by nanoindentation loading and creep tests.The loading segment mainly reflects dislocation nucleation,but creep mainly indicates dislocation movement.Cited by 7Publish Year 2019Author Yuanjian Hong,Chengshuang Zhou,Yuanyuan Zheng,Lin Zhang,Jinyang Zheng,Xingyang ChenDependence of strain rate on hydrogen-induced hardeningMay 21,2019 Effect of hydrogen and strain rate on nanoindentation#0183;The behavior of hydrogen-induced hardening of 310S and 304 austenitic stainless steels was investigated by using nanoindentation constant strain rate (CSR) and strain rate jump tests.Hydrogen increases the hardness at all strain rates,and the effect of hydrogen-induced hardening becomes stronger with increasing the strain rate in 310S steel.

Cited by 6Publish Year 2019Author Xian Shi,Xian Shi,Zhiliang He,Shengxiang Long,Yongmin Peng,Dongjie Li,Shu Jiang,Shu JiangAdvanced Nanoindentation Testing for Studying Strain-Rate

Aug 28,2017 Effect of hydrogen and strain rate on nanoindentation#0183;Nanoindentation became a versatile tool for testing local mechanical properties beyond hardness and modulus.By adapting standard nanoindentation test methods,simple protocols capable of probing thermally activated deformation processes can be accomplished.Abrupt strain-rate changes within one indentation allow determining the strain-rate dependency of hardness at variousCited by 62Publish Year 2012Author Hidetoshi Somekawa,Christopher A.SchuhVariation of the strain rate during CSM nanoindentation of ABSTRACT The indentation strain rate is currently assumed to remain unvaried during continuous stiffness measurement (CSM) nanoindentation where isCited by 4Publish Year 2019Author Christian M Effect of hydrogen and strain rate on nanoindentation#252;ller,Mohammad Zamanzade,Christian MotzEffect of Strain Rate on Deformation Behavior of May 05,2016 Effect of hydrogen and strain rate on nanoindentation#0183;In this study,nanoindentation tests with continuous stiffness measurement technique were measured to investigate the deformation behavior of a high-entropy alloy AlCoCrFeNi under different indentation strain rates at room temperature.Results suggest that the creep behavior exhibits remarkable strain rate dependence.In-situ scanning images showed a conspicuous pileup around

Cited by 2Publish Year 2017Author Eva Hasenhuetl,Ryuta Kasada,Zhexian Zhang,Kiyohiro Yabuuchi,Akihiko KimuraHigh-strain-rate nanoindentation behavior of fine-grained

The effects of temperature and alloying elements on deformation in the high-strain-rate regime were investigated by testing fine-grained magnesium alloys with an average grain size of 2 3 m by a nanoindentation technique.Cited by 2Publish Year 2017Author Emil V Jelenkovi,Suet To,Lyudmila V Goncharova,Sing Fai WongNanoindentation and morphological studies on nylon 66 Nov 01,2004 Effect of hydrogen and strain rate on nanoindentation#0183;Typical loadingholdunloading sequence was used to indent on neat PA66 and the nanocomposite with 5 wt% of clay ().Four strain rates,i.e.2,5,10 and 20% s 1,were used to explore the strain rate effect on the mechanical properties of the materials.The typical nanoindentation tests were carried out as follows.Cited by 14Publish Year 2008Author Afrooz Barnoush,Bo Yang,Horst VehoffLoading rate effect on the mechanical behavior of brittle Mar 08,2019 Effect of hydrogen and strain rate on nanoindentation#0183;Strain rate sensitivity (SRS) is an indication of the effects of strain rate on material properties .Normally,effect on hardness is often considered using the strain rate sensitivity concept,which is defined as the change in the indentation hardness,H,divided by the change in the indentation strain rate at a constant temperature.

Cited by 110Publish Year 2004Author Lu Shen,In Yee Phang,Tianxi Liu,Kaiyang ZengEffect of Hydrogen and Grain Boundaries on Dislocation

A.Barnoush,H.Vehoff In situ electrochemical nanoindentation of a nickel (111) single crystal Hydrogen effect on pop-in behaviour,International Journal ofAuthor Yuanjian Hong,Chengshuang Zhou,Yuanyuan Zheng,Lin Zhang,Jinyang Zheng,Xingyang ChenPublish Year 2019Nanoindentation of silicon implanted with hydrogen effect Jul 01,2017 Effect of hydrogen and strain rate on nanoindentation#0183;The maximum hydrogen concentration was varied from ~4 Effect of hydrogen and strain rate on nanoindentation#215; 10 20 to ~3.2 Effect of hydrogen and strain rate on nanoindentation#215; 10 21 cm -3 .The implanted Si was investigated by nanoindentation.From the dynamic nanoindentation test,it was found that in hydrogen-implanted Si hardness is increased significantly,while the elastic modulus isAuthor Dariusz M.Jarzbek,Micha Milczarek,Szymon Nosewicz,Piotr Bazarnik,Helmut SchiftPublish Year 2020Yuanjian HONG Doctor of Engineering Zhejiang The behavior of hydrogen-induced hardening of 310S and 304 austenitic stainless steels was investigated by using nanoindentation constant strain rate (CSR) and strain rate jump tests.

12345NextMicromachines Free Full-Text The Impact of Hydrogen on

Another important advantage is that the top surface is not affected by corrosion by the electrolyte.The nanoindentation results show that hydrogen reduces the activation energy for homogenous dislocation nucleation by approximately 1520% in a (001) grain.The elastic modulus also was observed to be reduced by the same amount.(PDF) The effects of hydrogen on deformation and cross However,TEM observations suggesting cross slip is reduced in the presence of hydrogen [3] provide a mechanism by which the nanoindentation observations can be explained.If pileup around an indentation is induced partially by cross slip underneath the indenter tip,we would expect less pileup as the hydrogen content is increased (as was (PDF) Nanoindentation and morphological studies on nylon The studies of the effects of other experimental parameters for nanoindentation (such as holding time,frequency imposed on loading,and so on) on the mechanical properties of PA66/clay nanocomposites are still in progress.Fig.1 .1Loading-hold-unloading curves showing strain rate effect for neat PA66 (A) and its nanocomposite containing 5 wt

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