High temperature deformation behaviors of the Zr63.36Cu14.52Ni10.12Al12 bulk metallic glass

Zhang, Yao; Qiao, J.C.; Pelletier, Jean-Marc; Yao, Yao

doi:10.1007/s10853-016-9729-6

Cited by 24 publications

(5 citation statements)

References 52 publications

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“…It is well known that the free volume plays a prominent role in the mechanical properties of bulk metallic glasses [22][23][24]. According to the free volume theory, the compressive strain rate at high temperature of metallic glasses can be described as [23]: Assuming that the average atomic volume of Zr 65 Cu 18 Ni 7 Al 10 metallic glass is Ω = 0.013 nm 3 [30], it represents that about 17 atomic volumes participate in a certain activation process. In our former research on creep of the Zr 65 Cu 18 Ni 7 Al 10 metallic glass [19], the activation volume is in the vicinity of 0.12 nm 3 and corresponding to about 10 atoms, which is because the test temperature are slightly lower than T g .…”

Section: Activation Volumementioning

confidence: 99%

Arrhenius activation of Zr65Cu18Ni7Al10 bulk metallic glass in the supercooled liquid region

et al. 2017

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In the current research, the dynamic mechanical spectrum and compressive deformation of Zr 65 Cu 18 Ni 7 Al 10 bulk metallic glass in the supercooled liquid region (SLR) are investigated. The experimental results prove the existence of transition from Newtonian flow to non-Newtonian flow in the metallic glasses. In addition, we found that the characteristic stress σ tc , which is obtained by a stretched exponential function based on the normalized viscosity, can be regarded as a transition point from Newtonian to non-Newtonian flow. The correlation between strain rate sensitivity exponent and corresponding strain rate was obtained at a certain temperature. It is noted that the variation of transition strain rate from Newtonian to non-Newtonian flow with different absolute temperatures follows the Arrhenius equation. The activation energy is in good accordance with that using the mechanical spectroscopy method.

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Section: Activation Volumementioning

confidence: 99%

Arrhenius activation of Zr65Cu18Ni7Al10 bulk metallic glass in the supercooled liquid region

et al. 2017

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“…According to the free volume theory, the induced stress leads to the annihilation of short and medium range scale clusters and provides more disordered structures, which is corresponding to the small strains. At higher strain rates, in which high flow stress levels are observed, the induced strain is related to the formation and percolation of shear transformation zones (STZs) governing the plasticity behavior of amorphous alloys 36,37 . Considering alloying composition, it is clear that the Si microalloying leads to a delay in the enhancement of flow stress in all the tested temperatures.…”

Section: Resultsmentioning

confidence: 99%

Role of Si Minor Addition on Glass Formation and Flow Stress Characteristics of a Zr-Based Metallic Glass

et al. 2021

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The characterization of strain rate effects near glass transition temperature (T g ) gives important information on flow behavior of metallic glasses (MGs). For this purpose, the tensile strain rate jump test was carried out near glass transition temperature to evaluate the flow behaviors of ZrCoAl(Si) MG ribbons. The primary thermal analyses showed that the Si minor addition into the ZrCoAl alloy leads to the betterment of thermal stability and the glass forming ability (GFA), correlated with the small size of Si atoms and subsequent formation of denser atomic clusters and thermodynamically liquid stabilization in the system. The tensile strain rate jump test indicated that minor adding of Si element decreases the sensitivity of glassy alloy to the flow stress and improves the stability of amorphous structure under increase in the strain rate and applied temperature. It was also observed that the viscosity behavior is more stable with the increase of the strain rate and temperature in the Si-added sample, implying the high capability of viscoplastic response in this state.

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“…In Figure 7, it is clearly observed that the activation volume of La30Ce30Al15Co25 metallic glass at high-temperature deformation is more than 0.4 nm 3 . The average volume of atoms values Ω is considered to be 0.013 nm 3 [39]. It is reasonable to conclude that the activation volume for La30Ce30Al15Co25 metallic glass corresponds to about 40 atomic volumes.…”

Section: Resultsmentioning

confidence: 99%

“…[39]. It is reasonable to conclude that the activation volume for La30 Ce 30 Al 15 Co 25 metallic glass corresponds to about 40 atomic volumes.…”

mentioning

confidence: 90%

Correlation between High Temperature Deformation and β Relaxation in LaCe-Based Metallic Glass

Chen

Qiao

2020

Materials

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High-temperature deformation around the glass transition temperature Tg and the dynamic mechanical behavior of La30Ce30Al15Co25 metallic glass were investigated. According to dynamic mechanical analysis (DMA) results, La30Ce30Al15Co25 metallic glass exhibits a pronounced slow β relaxation process. In parallel, strain-rate jump experiments around the glass transition temperature were performed in a wide range of strain rate ranges. The apparent viscosity shows a strong dependence on temperature and strain rate, which reflects the transition from non-Newtonian to Newtonian flow. At low strain or high temperature, a transition was observed from a non-Newtonian viscous flow to Newtonian viscous flow. It was found that the activation volume during plastic deformation of La30Ce30Al15Co25 metallic glass is higher than that of other metallic glasses. Higher values of activation volume in La30Ce30Al15Co25 metallic glass may be attributed to existence of a pronounced slow β relaxation. It is reasonable to conclude that slow β relaxation in La30Ce30Al15Co25 metallic glass corresponds to the “soft” regions (structural heterogeneities) in metallic glass.

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High temperature deformation behaviors of the Zr63.36Cu14.52Ni10.12Al12 bulk metallic glass

Cited by 24 publications

References 52 publications

Arrhenius activation of Zr65Cu18Ni7Al10 bulk metallic glass in the supercooled liquid region

Arrhenius activation of Zr65Cu18Ni7Al10 bulk metallic glass in the supercooled liquid region

Role of Si Minor Addition on Glass Formation and Flow Stress Characteristics of a Zr-Based Metallic Glass

Correlation between High Temperature Deformation and β Relaxation in LaCe-Based Metallic Glass

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