Deformation Behavior of the Zr53.5Cu26.5Ni5Al12Ag3 Bulk Metallic Glass Over a Wide Range of Strain Rate and Temperatures

Ma, Guohong; Zhu, Zhengwang; Wang, Zheng; Zhang, Haifeng

doi:10.1016/j.jmst.2015.06.001

Cited by 22 publications

(6 citation statements)

References 21 publications

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“…To provide context to our results, flow data for nine bulk MGs obtained from literature was compiled in Fig. 5b 26 27 28 29 36 37 38 39 40 . The deformation mode is again determined from the strain-rate sensitivity as previously described for the nanowire tension and bulk compression experiments presented here.…”

Section: Resultsmentioning

confidence: 99%

“…A black dashed line, determined from ( b ), is included to highlight the transition at different viscosities for compiled bulk data. Compiled bulk data from this work (filled squares) and the literature 26 27 28 29 36 37 38 39 40 in ( b ) shows a deformation map over a range of viscosities and strain-rates. From the compiled data, an average transition from Newtonian to non-Newtonian deformation is determined as shown by the dashed black line.…”

Section: Figurementioning

confidence: 99%

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Thermomechanical Behavior of Molded Metallic Glass Nanowires

Magagnosc

Chen

Kumar

et al. 2016

Sci Rep

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Metallic glasses are disordered materials that offer the unique ability to perform thermoplastic forming operations at low thermal budget while preserving excellent mechanical properties such as high strength, large elastic strain limits, and wear resistance owing to the metallic nature of bonding and lack of internal defects. Interest in molding micro- and nanoscale metallic glass objects is driven by the promise of robust and high performance micro- and nanoelectromechanical systems and miniature energy conversion devices. Yet accurate and efficient processing of these materials hinges on a robust understanding of their thermomechanical behavior. Here, we combine large-scale thermoplastic tensile deformation of collections of Pt-based amorphous nanowires with quantitative thermomechanical studies of individual nanowires in creep-like conditions to demonstrate that superplastic-like flow persists to small length scales. Systematic studies as a function of temperature, strain-rate, and applied stress reveal the transition from Newtonian to non-Newtonian flow to be ubiquitous across the investigated length scales. However, we provide evidence that nanoscale specimens sustain greater free volume generation at elevated temperatures resulting in a flow transition at higher strain-rates than their bulk counterparts. Our results provide guidance for the design of thermoplastic processing methods and methods for verifying the flow response at the nanoscale.

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Section: Resultsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Thermomechanical Behavior of Molded Metallic Glass Nanowires

Magagnosc

Chen

Kumar

et al. 2016

Sci Rep

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“…In recent years, from the microscopic perspective, researchers have gradually revealed the propagation characteristics and mechanical relaxation mechanism of shear bands during the deformation of amorphous alloy materials [22][23][24]. Studies on the mechanical properties of Zr-based amorphous alloys show that temperature [25,26], strain rate [27][28][29], and component elements [30,31] affect the dynamic mechanical properties of amorphous alloys.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Zr‐Based Amorphous Alloy as a Shaped Charge Liner

Shi

Huang

2022

Propellants Explo Pyrotec

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This study aimed to investigate the mechanical properties of Zr-based amorphous alloy at high strain rates and its use as a shaped charge liner. A split Hopkinson pressure bar (SHPB) was used to carry out dynamic mechanical performance tests, and a scanning electron microscope (SEM) was used to observe the fracture morphology of the test piece. The X-ray test of the jet formation and the static penetration test of the Zr-based amorphous alloy jet were performed. It was found that the amorphous alloy material exhibits typical brittle fracture characteristics under high strain-rate compression. As the strain rate increases, molten droplet-like structures appear in the frac-ture morphology, and the melting area is proportional to the strain rate. The Zr-based amorphous alloy liner forms a non-cohesive jet driven by explosive explosion. The actual projection angle of the liner is slightly larger than the theoretical value of Taylor's projection angle because of the unique mechanical properties and fracture mechanism, while the collapse angle is slightly smaller. Compared with copper jet penetrating concrete, the aperture of Zr-based amorphous alloy jet is increased by 58 % and the caving volume is increased by 32 times. The results provide reference for the application of Zr-based amorphous alloy in the field of shaped charge liner.

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“…Uniaxial compression of bulk metallic glass pillars is a common mechanical test that probes their nano-and micro-scale mechanical response. Studies have shown that the strength of BMGs under compression decreases with increasing temperature [5][6][7], since higher temperatures enhance the activation of shear transformation zones and formation of shear bands [8]. However, there is no consensus about the behavior of the compressive strength as a function of strain rate for BMGs [5,[9][10][11][12][13][14][15][16][17][18][19], where the compressive strength is defined as the maximum engineering stress prior to steady flow.…”

mentioning

confidence: 99%

“…where the coefficients k and c have units of s −1 and K, respectively, and the power-law exponents satisfy β > α 1 0 7 1 0 8 1 0 9 1 0 1 0 1 0 0 0 0 0 0 1 0 1 2 1 4 1 0 7 1 0 8 1 0 9 1 0 1 0 0 2 4 6 q u a s i s t a t i c and depend on b. Note that α = 0 for systems with b = 0.…”

mentioning

confidence: 99%