Loading rate effect on the creep behavior of metallic glassy films and its correlation with the shear transformation zone

Ma, Yi; Ye, J.H.; Peng, Guangjian; Wen, Desheng; Zhang, T.H.

doi:10.1016/j.msea.2014.11.022

Cited by 40 publications

(18 citation statements)

References 35 publications

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“…The displacement and load resolutions of the machine are 0.01 nm and 50 nN, respectively. The as-deposited films could be directly applied on nanoindentation testing due to the ultralow roughness of metallic glassy film surface [19]. For the creep tests, a constant-load holding method was used, and the displacement of indenter into the surface at a prescribed load could be continuously recorded.…”

Section: Methodsmentioning

confidence: 99%

“…To authors' best knowledge, the creep behaviors of metallic glasses concerned with loading rate [16], holding load [16,17] and initial strain [18] were qualitatively explained through free volume. In our previous work, the loading rate effect on creep was found to be composition-dependent and apparently related to the STZ size [19]. Though the exact creep response on the variation of STZ size is far from understanding due to the changes of other structural or physical parameters at the same time as the composition changes.…”

Section: Introductionmentioning

confidence: 95%

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Nanoindentation investigation on the creep mechanism in metallic glassy films

Peng

Feng

et al. 2016

Materials Science and Engineering: A

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a b s t r a c tUsing the magnetron sputtering technique, two metallic glassy films namely Cu 44.3 Zr 45.1 Al 10.6 and Cu 44.2 Zr 43 Al 11.3 Ti 1.5 were prepared by alloy targets. The minor Ti addition effectively induces excess free volume. Upon spherical nanoindentation, the creep behaviors of both films were studied at various peak loads. As the increase of peak load, the creep deformations became more severely in both samples. Interestingly, Cu-Zr-Al-Ti film crept stronger than Cu-Zr-Al at small-load holdings (nominal elastic regimes), whereas it is opposite at high-load holdings (plastic regimes). The creep characteristic could be intrinsically related to the scale variation of the shear transformation zone (STZ) with Ti addition. Statistical analysis was employed to estimate the STZ volume, which increased by 60% with Ti addition in the Cu-Zr-Al film. The finite element modeling indicated that STZs would be activated even at the minimum load we adopted. Higher activation energy of larger STZs in Cu-Zr-Al-Ti enables less flow units, which offsets the creep enhancement by the excess free volume with Ti addition. The deeper the pressed depth of the indenter, the more contribution of the STZ operation on creep deformation. In addition, experimental observation on the creep flow rates implies that STZ could be the dominating mechanism at the steady-state creep. This study reveals that STZ volume could also be important to the time-dependent plastic deformation in metallic glass, besides as a key parameter for instantaneous plasticity.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Nanoindentation investigation on the creep mechanism in metallic glassy films

Peng

Feng

et al. 2016

Materials Science and Engineering: A

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“…The displacement and load resolutions of the machine are 0.01 nm and 50 nN, respectively. The as-deposited films could be directly applied on nanoindentation testing due to the ultralow roughness of metallic glassy film surface [25]. 120 tests with load-control mode were conducted on each sample to detect the relationship between the applied load and penetration depth (P vs. h).…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation study on the characteristic of shear transformation zone volume in metallic glassy films

Peng

Debela

et al. 2015

Scripta Materialia

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“…Both the creep displacement and creep rate at steady-state stage were enhanced by increasing holding depth. It is worth mentioning that the surface roughness of La-Co-Al metallic glassy film was about 0.5 nm on the area of 5 × 5 µm in author's previous work [26]. Therefore the surface roughness could be negligible to the holding depths used here.…”

Section: Methodsmentioning

confidence: 73%

“…For the nanoindentation tests, a La-based metallic glassy film with low creep resistance was selected [25]. The smooth and uniform surface of metallic glassy film can ensure nanoindentation accuracy at shallow depths [26].…”

Section: Introductionmentioning

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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Loading rate effect on the creep behavior of metallic glassy films and its correlation with the shear transformation zone

Cited by 40 publications

References 35 publications

Nanoindentation investigation on the creep mechanism in metallic glassy films

Nanoindentation investigation on the creep mechanism in metallic glassy films

Nanoindentation study on the characteristic of shear transformation zone volume in metallic glassy films

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

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