Understanding of micro-alloying on plasticity in Cu 46 Zr 47−x Al 7 Dy x (0≤ x ≤ 8) bulk metallic glasses under compression: Based on mechanical relaxations and theoretical analysis

Qiao, J.C.; Yao, Yao; Pelletier, Jean-Marc; Keer, Leon M.

doi:10.1016/j.ijplas.2016.02.002

Cited by 163 publications

(39 citation statements)

References 56 publications

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“…displays evolution of the normalized storage modulus (G') and loss modulus (G") of the Cu 46 Zr 46 Al 8 metallic glass from ambient temperature to 873 K. G u is the non-relaxed modulus, which is assumed to be the value of G' at room temperature. Similar to other metallic glasses[22,[27][28][29], the mechanical relaxation behaviour of the Cu 46 Zr 46 Al 8 glass shows three different temperature domains based on the storage and loss modulus: (i) In the low temperature range (from the room temperature to 625 K), the material is in glassy state and the elastic behavior dominates. In this temperature range, there is no notable relaxation peak of the lossmodulus being observed for Cu 46 Zr 46 Al 8 .…”

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confidence: 73%

“…Based on the mechanical relaxation results, it was found by several researchers that the slow  relaxation is connected to the physical and mechanical properties in metallic glasses: (i) the relaxation is associated with the plastic deformation [18]; (ii) the activation energy of the slow  relaxation is related to the potential energy barriers of the shear transformation zones [19]; (iii) the slow  relaxation is linked to the diffusion motion of the smallest constituent atomic species [20] (iv) the slow relaxation depends on the chemical interactions among all the constituting atoms [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Physical aging effects on the dynamic relaxation behavior and mechanical properties of Cu46Zr46Al8 metallic glass

Qiao¹,

Feng²,

Pelletier³

et al. 2017

Journal of Alloys and Compounds

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Mechanical relaxation of glassy materials is strongly influenced by their mechanical and physical properties. In the current study, dynamic mechanical relaxation of Cu46Zr46Al8 metallic glass has been investigated by mechanical spectroscopy and molecular dynamics simulations. Our results show that mechanical properties of metallic glasses are highly dependent on their thermal history. a relaxation in the frequency region of the Cu46Zr46Al8 metallic glass was described by Havriliak-Negami (HN) model. In the framework of the quasi-point defects theory, the correlated factor ¿ could be used to characterize the concentration of “defects” of glassy materials. By molecular dynamics simulations of dynamic mechanical tests at different temperatures and frequencies, it is noted that adjusting of defects is inversely correlated to storage modulus at the atomic level. On the other hand, physical aging below the glass transition temperature Tg reduces the concentration of defects and narrows down the width of shear bands, which corresponds to decreasing of the atomic mobility.Peer ReviewedPostprint (author's final draft

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confidence: 73%

Section: Introductionmentioning

confidence: 99%

Physical aging effects on the dynamic relaxation behavior and mechanical properties of Cu46Zr46Al8 metallic glass

Qiao¹,

Feng²,

Pelletier³

et al. 2017

Journal of Alloys and Compounds

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“…At first, we need to choose a CuZr-based BMG as the base material. According to the previous study (Qiao et al, 2016;Yu and Bai, 2008), the glass-forming ability (GFA) and plasticity of the Cu-Zr-Al ternary BMGs strongly depends on the content of Al. On one hand, it was reported that, when the content of Al is around 4∼5% (in atomic percent), the Cu-Zr-Al BMGs could possess a relatively large value of Poisson's ratio and show a plastic strain of 18% before failure (Das et al, 2005;Yu and Bai, 2008).…”

Section: Microstructures Of the Cu 48 Zr 48 Al 4 Bmg Compositementioning

confidence: 95%

Transformation-mediated plasticity in CuZr based metallic glass composites: A quantitative mechanistic understanding

Sun

Song

Pauly

et al. 2016

International Journal of Plasticity

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In this paper, we present a thorough stress analysis of the Cu-Zr metallic-glass composite with embedded B2 particles subject to a martensitic transformation. Within the framework of the Eshelby theory, we are able to explain, in a quantitative manner, (1) the formation of three types of shear bands with distinct morphologies as observed experimentally in the severely deformed Cu-Zr metallic-glass composite and (2) the work hardening ability of the Cu-Zr metallic-glass composite as related to the coupled effects of elastic back stress and elastic mismatch caused by the martensitic transformation. Furthermore, we also discuss the issues about the stress affected zone of the individual B2 phase and the stability of the crystalline-amorphous interface. Given the general agreement between the theoretical and experimental findings, we believe that the outcome of our current work can lead to a deeper understanding of the transformation-induced plasticity in the Cu-Zr based metallic glass composites, which should be very useful to the design of the metallic-glass composites with improved ductility.

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“…have presented enhanced mechanical properties of Al-Ni-Co-Gd by nanocrystallization of amorphous alloys 19 . Moreover, it has been presented that introducing additional rare metal alloying elements could promote the glass forming ability and modify the mechanical properties of metallic glasses 17,18 . Qiao et al .…”

Section: Introductionmentioning

confidence: 99%

“…Qiao et al . investigates that the micro-alloying of Dy could play an important role to influence plasticity of the Cu-based metallic glasses 17 . Park et al .…”

Section: Introductionmentioning

confidence: 99%

High strength nanostructured Al-based alloys through optimized processing of rapidly quenched amorphous precursors

Kim

Lee

Park

et al. 2018

Sci Rep

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We report the methods increasing both strength and ductility of aluminum alloys transformed from amorphous precursor. The mechanical properties of bulk samples produced by spark-plasma sintering (SPS) of amorphous Al-Ni-Co-Dy powders at temperatures above 673 K are significantly enhanced by in-situ crystallization of nano-scale intermetallic compounds during the SPS process. The spark plasma sintered Al84Ni7Co3Dy6 bulk specimens exhibit 1433 MPa compressive yield strength and 1773 MPa maximum strength together with 5.6% plastic strain, respectively. The addition of Dy enhances the thermal stability of primary fcc Al in the amorphous Al-TM -RE alloy. The precipitation of intermetallic phases by crystallization of the remaining amorphous matrix plays important role to restrict the growth of the fcc Al phase and contributes to the improvement of the mechanical properties. Such fully crystalline nano- or ultrafine-scale Al-Ni-Co-Dy systems are considered promising for industrial application because their superior mechanical properties in terms of a combination of very high room temperature strength combined with good ductility.

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Understanding of micro-alloying on plasticity in Cu 46 Zr 47−x Al 7 Dy x (0≤ x ≤ 8) bulk metallic glasses under compression: Based on mechanical relaxations and theoretical analysis

Cited by 163 publications

References 56 publications

Physical aging effects on the dynamic relaxation behavior and mechanical properties of Cu46Zr46Al8 metallic glass

Physical aging effects on the dynamic relaxation behavior and mechanical properties of Cu46Zr46Al8 metallic glass

Transformation-mediated plasticity in CuZr based metallic glass composites: A quantitative mechanistic understanding

High strength nanostructured Al-based alloys through optimized processing of rapidly quenched amorphous precursors

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