Nanoindentation analysis of time-dependent deformation in as-cast and annealed Cu–Zr bulk metallic glass

Yoo, Byung Gil; Oh, Jun Hak; Kim, Yong Jae; Park, Kyoung Won; Lee, Jae Chul; Jang, Jae-il

doi:10.1016/j.intermet.2010.02.032

Cited by 51 publications

(23 citation statements)

References 29 publications

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“…The present results are apparently contradictory to Yoo's that the more free volume content the sample contained, the easier the occurrence of creep in metallic glass [18]. Actually, it's widely believed that free volume facilitates creep flow and annealing has been confirmed as an effective treatment to strengthen the creep resistance in metallic glass [15]. Here, the Cu-Zr-Al-Ti film with more free volume exhibited a generally weakened creep flow at the high-load holdings compared to the Cu-Zr-Al film.…”

Section: Resultscontrasting

confidence: 96%

“…The STZ volume might be little changed or even decreased, which was leave out of consideration in those studies [15,17,18]. Indentation creep would depend on multiple intrinsic and/or external parameters in metallic glasses.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the holding stage could be time-saving due to the high accuracy for obtaining the time-dependent plastic deformation. However, the stress distribution beneath the indenter is much more complicated and plastic deformation always occurred before the holding stage [15][16][17][18]. Thus, metallic glasses having high glass transition temperature (T g ) can even creep at room temperature in nanoindentation.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultscontrasting

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Whilst a number attempts have been made to explore the mechanisms underlying MG creep deformation [5,7,12,13], the physical process dominating the creep behavior remains mysterious and has been the recent topic of intense discussion.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale creep deformation in Zr-based metallic glass

Wang¹,

Li²,

Huang³

et al. 2013

Intermetallics

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“…Therefore, the higher loading rate would create more defects and displacements during deformation. 20 In this work, in an attempt to show if the diffusion can become the responsible mechanism for ceramics under indentation tests, the time-dependent creep experiments were conducted on c-plane (0001), a-plane (1120) and m-plane (1010) of single-crystal ZnO by nanoindentation with nano-scaled Berkovich tip. To figure out the creep mechanisms of single-crystal ZnO under nanoindentation tests, it is necessary to estimate the values of indicator, i.e.…”

Section: Resultsmentioning

confidence: 99%

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

Lin

Chen

et al. 2016

AIP Advances

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The nanoindentation time-dependent creep experiments with different peak loads are conducted on c-plane (0001), a-plane (112¯0) and m-plane (101¯0) of single-crystal ZnO. Under nano-scaled indentation, the creep behavior is crystalline orientation-dependent. For the creep on (0001), the stress exponent at low loads is ∼1 and at high loads ∼4. The stress exponents under all loads are within 3∼7 for the creep on (112¯0) and (101¯0). This means that diffusion mechanism and dislocation mechanism is operative for different planes and loads. The relative difficulty of dislocations activation is an additional factor leading to the occurring of diffusion creep on the c-plane of single-crystal ZnO.

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Nanoindentation analysis of time-dependent deformation in as-cast and annealed Cu–Zr bulk metallic glass

Cited by 51 publications

References 29 publications

Nanoindentation investigation on the creep mechanism in metallic glassy films

Nanoindentation investigation on the creep mechanism in metallic glassy films

Nanoscale creep deformation in Zr-based metallic glass

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

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