Nanoscale creep deformation in Zr-based metallic glass

Wang, F.; Li, J.M.; Huang, Ping; Wang, W.L.; Lu, Tianjian; Xu, K.W.

doi:10.1016/j.intermet.2013.03.006

Cited by 47 publications

(20 citation statements)

References 36 publications

(46 reference statements)

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“…2, at the initial stage of the holding period, the ( ) h t t curves are very similar in shape with the typical nanoindentation creep curves observed in previous studies for metals [5], metallic glasses [10,11], coatings [12], and thin films [13]. The nanoindentation creep observed during the holding period was usually reported to be dependent strongly on the loading rate or strain rate, used during the loading period [10][11][12][13]. In general, the creep deformation increases with increasing loading rate.…”

Section: Resultssupporting

confidence: 84%

“…As can be seen, all the curves shown in Fig. 3 behave very similar in both the shape and the loading rate dependence with the typical nanoindentation creep curve [10][11][12][13], giving an indirect support for the above conjecture that an unknown process, which may result in a decrease in displacement, would co-exist with creep during nanoindentation holding period. Figure 4 shows the best fit-value of the parameter B in Eq.…”

Section: Resultssupporting

confidence: 57%

“…First, most of the previous studies concern the metals or metallic glasses [6,10,13] which exhibit significant plasticity during loading period and significant creep during holding period. The displacement change associated with the unknown process is comparatively small and has little effect on the displacement-time relation.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

An abnormal displacement change during holding period in nanoindentation tests on zirconia dental ceramic

Zhang

Shao

et al. 2016

J Adv Ceram

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An abnormal displacement change observed during the holding period in nanoindentation tests on a zirconia dental ceramic was reported in this paper. It was found that, at the initial stage of the holding period, the measured displacement versus time curves were similar in shape with the typical indentation creep curve reported in previous studies. As the holding lasted for long time, however, an evident reduction in displacement was observed for tests with high loading rate, implying that another unknown process, which might result in a decrease in displacement, would co-exist with creep during holding period. Elastic recovery was suggested to be one of the possible sources for such a displacement reduction. An empirical method was also proposed to eliminate the effect of this displacement reduction on the determination of hardness and Young's modulus.

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Section: Resultssupporting

confidence: 84%

Section: Resultssupporting

confidence: 57%

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An abnormal displacement change during holding period in nanoindentation tests on zirconia dental ceramic

Zhang

Shao

et al. 2016

J Adv Ceram

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“…In present study, the cases with peak loads of 1 mN, 2 mN and 4 mN could meet the requirement of free volume-dominating creep. Meanwhile, the initial pressed depth of 8 mN holding had reached about 100 nm, which is far beyond the critical penetration depth for interfacial diffusion as Wang et al reported [23]. Therefore, free volume creation and annihilation would not be the main deformation mechanism for the 8 mN, 12 mN and 16 mN creep tests, and interfacial diffusion could be insignificant.…”

Section: Resultsmentioning

confidence: 92%

“…For metallic glasses, the free volume evolution [14] and interfacial diffusion [23] were expected to be the deformation modes of creep flow within elastic and/or shallow depth regime. In present study, the cases with peak loads of 1 mN, 2 mN and 4 mN could meet the requirement of free volume-dominating creep.…”

Section: Resultsmentioning

confidence: 99%

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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