Size- and constituent-dependent deformation mechanisms and strain rate sensitivity in nanolaminated crystalline Cu/amorphous Cu–Zr films

Wang, Y.Q.; Zhang, J.Y.; Liang, Xiaoqing; Wu, Kai; Liu, G.; Sun, Jun

doi:10.1016/j.actamat.2015.05.007

Cited by 77 publications

(24 citation statements)

References 91 publications

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“…During the creep deformation, the movement of STZs will cause local dilatation of the nearby free volume, which creates localized distortions of neighboring STZs and promotes the SB initiation by either decreasing the required activation energy or rendering more possible STZs. As mentioned in the previous study [8], DID becomes more intense in thinner Cu-Zr films during plastic deformation, inducing more pronounced localized dilatation. That means there will be more flow units STZs (associated with more free volumes) participating in the collective operation and generating many fine SBs in thinner films, which induces a more homogeneous-like plastic flow of the material.…”

Section: Size-dependent Hardness and Srsmentioning

confidence: 71%

“…Liu et al revealed a seemingly negative SRS in Zr-based films using displacement controlled nanoindentation, which was qualitatively interpreted by the effective strain ratedependent degree of elastic deformation [27]. In the previous study [8], the size-dependent negative SRS of Cu-Zr films was measured by the method of changing nanoindentation loading rate, and explained in terms of the deformation-induced devitrification (DID) behavior. In any case, the deformation mechanism during the plastic flow is closely related to the variation of free volume in materials.…”

Section: Size-dependent Hardness and Srsmentioning

confidence: 99%

“…Reducing the sample size is one potential way to enable MGs to be capable of exhibiting some ductility, such as the two-dimensional film materials, which can restrict the existing shear transformation zones (STZs) from reaching a critical size to form a mature shear band (SB) [7][8][9]. Recently, some researchers have studied the evolution of deformation morphology, microstructural characterization and mechanical properties for various MG film thicknesses.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nanoindentation creep behavior of Cu–Zr metallic glass films

Wang

Zhang

et al. 2017

Materials Research Letters

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The size-dependent hardness, strain-rate sensitivity (SRS) and shear transformation zone (STZ) volume of co-sputtered Cu-Zr metallic glass films with film thickness h spanning from 1000 to 3000 nm were systematically investigated by nanoindentation creep tests at room temperature. Experimental results manifested an exceptional decrease in hardness and a monotonic increment in SRS (or a monotonic decline in STZ volume) with reducing h. The deformation mechanism could be rationalized in light of more free volume combined with smaller STZs in thinner films, which likely trigger the strain-softening behavior. Moreover, STZs and deformation-induced devitrification promote the homogeneous-like plastic flow. IMPACT STATEMENTEmploying nanoindentation creep tests revealed size-dependent hardness and strain-rate sensitivity in metallic glass films, enabling comprehensive understanding of the deformation mechanism based on atomic-scale shear transformation zone theory. ARTICLE HISTORY

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Section: Size-dependent Hardness and Srsmentioning

confidence: 71%

Section: Size-dependent Hardness and Srsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanoindentation creep behavior of Cu–Zr metallic glass films

Wang

Zhang

et al. 2017

Materials Research Letters

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“…Most previous studies on the mechanical properties of amorphous/crystalline multilayer structures have been conducted on sputtered Cu/Cu-Zr multilayer structures [16][17][18]. It was found that the presence of the crystalline layers prevents the formation of catastrophic shear bands in the amorphous phase which was attributed to a minimum size that is necessary to induce shear localization [16].…”

Section: Introductionmentioning

confidence: 99%

Tailoring the magnetic properties of nanocrystalline Cu-Co alloys prepared by high-pressure torsion and isothermal annealing

Bachmaier

Krenn

Knöll

et al. 2017

Journal of Alloys and Compounds

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In this study, severe plastic deformation by high-pressure torsion is used as a fabrication method for nanocrystalline magnetic Cu-Co alloys in bulk quantities. By subsequent isothermal annealing, phase separation of the supersaturated solid solutions can be obtained. The magnetic properties of the as-processed and annealed materials have been studied systemically and correlated to the evolving nanostructures investigated in detail by transmission electron microscopy and atom probe tomography. By additional high-pressure torsion deformation at liquid nitrogen temperature the magnetic properties of the Cu74Co26 alloy can be further tuned.

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“…In parallel, some experiments were carried out to study the size h-dependent strain rate sensitivity (SRS, m) of C/ CNLs [29] as well as C/ANLs [30]. Although the structure of constituents (e.g., face-centered cubic (FCC), BCC and hexagonal-close-packed (HCP) metals) can influence their size-dependent SRS [22,[31][32][33], the studies by Zhang et al [22,34] have verified that Cu/Cr, Cu/Mo and Cu/Zr C/CNLs with incoherent crystalline/crystalline interfaces (CCIs) displayed monotonically increased m with decreasing h. Interestingly, when h > 10 nm, the m of highly textured Cu/Ni NLs increases with decreasing h, but the opposite holds when h < 10 nm due to the formation of coherent CCIs [29].…”

Section: Introductionmentioning

confidence: 99%

Size-dependent mechanical properties and deformation mechanisms in Cu/NbMoTaW nanolaminates

et al. 2019

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High entropy alloys (HEAs) have attracted extensive attention due to their excellent properties in harsh environments. Here, we introduced the HEA NbMoTaW into the laminated structure to synthesize the Cu/HEA nanolaminates (NLs) with equal layer thickness h spanning from 5 to 100 nm, and comparatively investigated the size dependent mechanical properties and plastic deformation. The experimental results demonstrated that the hardness of Cu/HEA NLs increased with decreasing h, and reached a plateau at h ≤ 50 nm, while the strain rate sensitivity m unexpectedly went through a maximum with reducing h. The emergence of maximum m results from a transition from the synergetic effect of crystalline constituents to the competitive effect between crystalline Cu and amorphous-like NbMoTaW. Microstructural examinations revealed that shear banding caused by the incoherent Cu/HEA interfaces occurred under severe deformation, and the soft Cu layers dominated plastic deformation of Cu/HEA NLs with large h.

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Size- and constituent-dependent deformation mechanisms and strain rate sensitivity in nanolaminated crystalline Cu/amorphous Cu–Zr films

Cited by 77 publications

References 91 publications

Nanoindentation creep behavior of Cu–Zr metallic glass films

Nanoindentation creep behavior of Cu–Zr metallic glass films

Tailoring the magnetic properties of nanocrystalline Cu-Co alloys prepared by high-pressure torsion and isothermal annealing

Size-dependent mechanical properties and deformation mechanisms in Cu/NbMoTaW nanolaminates

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