Testing Effects on Shear Transformation Zone Size of Metallic Glassy Films Under Nanoindentation

Ma, Yi; Song, Yuxuan; Huang, Xianwei; Chen, Zhongli; Zhang, Taihua

doi:10.3390/mi9120636

Cited by 11 publications

(6 citation statements)

References 52 publications

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“…The nanoindentation size effect on SRS could be more clearly recognized from the correlation between m and holding depth in Figure 7a. Such reduction of m on the holding depth has been reported in crystalline and amorphous solids [23,24,25]. In previous work, m decreased at an initial shallow depth and quickly tended to be stable once the pressed depth was beyond 100nm in alloys.…”

Section: Resultssupporting

confidence: 73%

Room-Temperature Creep Behavior and Activation Volume of Dislocation Nucleation in a LiTaO3 Single Crystal by Nanoindentation

Huang

Song

et al. 2019

Materials

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The crystal orientation effect on mechanical heterogeneity of LiTaO3 single crystals is well known, whilst the time-dependent plastic behavior, i.e., creep is still short of understanding. Relying on nanoindentation technology, we systematically studied room-temperature creep flows at various holding depths (100 nm to 1100 nm) in three typical orientations namely the X-112°, Y-36° and Y-42° planes. Creep resistance was much stronger in the X-112° plane than the others. In the meanwhile, creep features were similar in the Y-36° and Y-42° planes. The orientation effect on creep deformation was consistent with that on hardness. The nanoindentation length scale played an important role in creep deformation that creep strains were gradually decreased with the holding depth in all the planes. Based on strain rate sensitivity and yield stress, the activation volumes of dislocation nucleation were computed at various nanoindentation depths. The activation volumes ranged from 5 Å3 to 23 Å3 for the Y-36° and Y-42° planes, indicating that a point-like defect could be the source of plastic initiation. In the X-112° plane, the activation volume was between 6 Å3 and 83 Å3. Cooperative migration of several atoms could also be the mechanism of dislocation activation at deep nanoindentation.

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Section: Resultssupporting

confidence: 73%

Room-Temperature Creep Behavior and Activation Volume of Dislocation Nucleation in a LiTaO3 Single Crystal by Nanoindentation

Huang

Song

et al. 2019

Materials

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“…The m range between 0.24 and 0.08 was much more comparable to that under the Berkovich indenter, indicating the same creep mechanism. On the other side, the phenomenon that m decreased with holding strain under plastic holdings could be qualitatively explained upon the enlargement of STZ size at deep nanoindentation [20,27].…”

Section: Resultsmentioning

confidence: 99%

“…The deposition duration was 120 minutes. The film thickness can be directly measured from cross-sections by scanning electron microscope (SEM), which was 2.7 µm [27]. The chemical composition of the as-prepared film was La 55 Co 20 Al 25 , by means of X-ray energy dispersive spectrometer (EDS) attached to the SEM.…”

Section: Methodsmentioning

confidence: 99%

Revealing Nanoindentation Size-Dependent Creep Behavior in a La-Based Metallic Glassy Film

Song

Zhang

2019

Nanomaterials

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We systematically studied nanoindentation size effect on creep deformation in a La-based metallic glassy film, including holding depth effect and indenter size effect. Creep displacement was mainly dependent on both holding strain and deformation volume beneath indenter. Under elastic holding, creep strain was merely holding strain-dependent. While for plastic holding, creep strain was greatly enhanced by adopting smaller indenter and/or decreasing holding depth at the same holding strain. A strong nanoindentation size effect on creep resistance was validated. Strain rate sensitivities (SRS) were calculated, which were obviously higher at elastic regions than at plastic holdings. The relationship between SRS value and creep mechanism in metallic glass was discussed. Author Contributions: Data curation, Y.S.; formal analysis, Y.S.; investigation, Y.M.; supervision, T.Z.; writing-original draft, Y.M.

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“…It should be emphasized that the SRS value of the nanoindentation creep flow could be greatly tied to the testing conditions such as holding time, loading rate and tip configuration [ 42 ]. It has been widely observed that m is increased with increasing holding time [ 42 ]. As shown in Figure 8 d, the slope between hardness and the strain rate was evidently lower at the transient stage in comparison to the steady-state segment.…”

Section: Resultsmentioning

confidence: 99%

The Strain Rate Sensitivity and Creep Behavior for the Tripler Plane of Potassium Dihydrogen Phosphate Crystal by Nanoindentation

Mao

Liu

et al. 2021

Micromachines

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As an excellent multifunctional single crystal, potassium dihydrogen phosphate (KDP) is a well-known, difficult-to-process material for its soft-brittle and deliquescent nature. The surface mechanical properties are critical to the machining process; however, the characteristics of deformation behavior for KDP crystals have not been well studied. In this work, the strain rate effect on hardness was investigated on the mechanically polished tripler plane of a KDP crystal relying on nanoindentation technology. By increasing the strain rate from 0.001 to 0.1 s−1, hardness increased from 1.67 to 2.07 GPa. Hence, the strain rate sensitivity was determined as 0.053, and the activation volume of dislocation nucleation was 169 Å3. Based on the constant load-holding method, creep deformation was studied at various holding depths at room temperature. Under the spherical tip, creep deformation could be greatly enhanced with increasing holding depth, which was mainly due to the enlarged holding strain. Under the self-similar Berkovich indenter, creep strain could be reduced at a deeper location. Such an indentation size effect on creep deformation was firstly reported for KDP crystals. The strain rate sensitivity of the steady-state creep flow was estimated, and the creep mechanism was qualitatively discussed.

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Testing Effects on Shear Transformation Zone Size of Metallic Glassy Films Under Nanoindentation

Cited by 11 publications

References 52 publications

Room-Temperature Creep Behavior and Activation Volume of Dislocation Nucleation in a LiTaO3 Single Crystal by Nanoindentation

Room-Temperature Creep Behavior and Activation Volume of Dislocation Nucleation in a LiTaO3 Single Crystal by Nanoindentation

Revealing Nanoindentation Size-Dependent Creep Behavior in a La-Based Metallic Glassy Film

The Strain Rate Sensitivity and Creep Behavior for the Tripler Plane of Potassium Dihydrogen Phosphate Crystal by Nanoindentation

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