Deformation response of cube-on-cube and non-coherent twin interfaces in AgCu eutectic under dynamic plastic compression

Eftink, B.P.; Mara, Nathan A.; Kingstedt, Owen T.; Safarik, D. J.; Wang, S.; Lambros, John; Robertson, I. M.

doi:10.1016/j.msea.2017.11.108

Cited by 14 publications

(10 citation statements)

References 35 publications

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“…SEM micrographs show co-deformation of both the Ag and Cu phase [18]. A detailed TEM study of dynamically deformed material identical to that of this study can be found in Eftink et al [20]. TEM analysis from dynamically deformed specimens found deformation in the form of localized dislocations in Cu, and dislocation cells in Ag.…”

Section:  supporting

confidence: 83%

“…We propose possible mechanisms that could aid in inelastic recovery within the examined material system based on microscopy observations of the Ag-Cu material system [20,35], experimental evidence of recovery in FCC materials [22,23,24,25] and modeling efforts [22,26,35] results. The three features proposed to contribute to the inelastic recovery in the dynamically deformed Ag-Cu material system are: 1) the high density of incoherent twin boundaries within the microstructure and the associated stress-fields at the bi-phase interface, because inelastic recovery was only observed in the Ag-Cu material system with a high density of the and 14.0° [20]. The change in interface structure is a result of the lack of deformation communication between Ag and Cu through the twin interface [20].…”

Section: Discussionmentioning

confidence: 99%

“…The three features proposed to contribute to the inelastic recovery in the dynamically deformed Ag-Cu material system are: 1) the high density of incoherent twin boundaries within the microstructure and the associated stress-fields at the bi-phase interface, because inelastic recovery was only observed in the Ag-Cu material system with a high density of the and 14.0° [20]. The change in interface structure is a result of the lack of deformation communication between Ag and Cu through the twin interface [20]. Therefore, the incoherent twin interface acts as a strong boundary to dislocation motion which likely leads to the development of a heterogeneous stress-state between layers.…”

Section: Discussionmentioning

confidence: 99%

“…Similar to the Cu-Nb system, the atomic interface structure in the Ag-Cu multilayered material system can be tailored during fabrication, and more specifically in this study through the solidification rate chosen during directional casting. Low cooling rates result in micron scale microstructured material with the cube-on-cube interface orientation (     11 1 || 11 1 Cu Ag , with aligned slip systems across the bi-phase interface) [17,18], while the highest cooling rates result in an ultrafine-grained microstructured material with a coherent twin interfaces [19] [17,20,18]. Previous studies have examined the cube-on-cube interface structure capturing anomalous twinning in Cu under conditions that would not normally exhibit twinning [16,17,21].…”

Section: | 111mentioning

confidence: 99%

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Inelastic strain recovery of a dynamically deformed unidirectional Ag Cu eutectic alloy

et al. 2016

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In this work we report experimentally observed inelastic recovery within a bulk directionally-cast Ag-Cu eutectic system tailored to possess a high density of incoherent twin interfaces. Incremental high strain-rate compression experiments were performed along the [101] crystallographic direction. Initial loading to a compressive strain of 0.10 was followed by inelastic strain recovery of 0.02 to 0.035. Further incremental loading saw decreasing inelastic strain recovery with each additional loading increment. Once a total compressive stain of 0.22 was reached there was cessation of inelastic strain recovery. Quasi-static compression and thermal experiments were conducted to elucidate the necessary loading conditions for inelastic recovery to occur in the Ag-Cu material and to provide insight of possible active recovery mechanisms.

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Section:  supporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: | 111mentioning

confidence: 99%

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Inelastic strain recovery of a dynamically deformed unidirectional Ag Cu eutectic alloy

et al. 2016

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“…Therefore, the relationship between their mechanical properties and microstructure parameters, and the optimization of these properties, are the hottest topics in this context of recent years [3][4][5][6]. Tremendous efforts have been made to find out the factors influencing the mechanical properties of multilayered films [7][8][9][10][11]. It has been demonstrated that the modulation parameters (such as the modulation period and modulation ratio) and the interfacial structure are the two main factors affecting the mechanical properties of a multilayered film with a particular combination of constituents [12].…”

Section: Introductionmentioning

confidence: 99%

Inapparent Strengthening Effect of Twin Interface in Cu/Pd Multilayered Films with a Large Lattice Mismatch

et al. 2019

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It has been found that there are two kinds of interfaces in a Cu/Pd multilayered film, namely, cube-on-cube and twin. However, the effects of the interfacial structure and modulation period on the mechanical properties of a Cu/Pd multilayered film remain unclear. In this work, molecular dynamics simulations of Cu/Pd multilayered film with different interfaces and modulation periods under in-plane tension are performed to investigate the effects of the interfacial structure and modulation period. The interface misfit dislocation net exhibits a periodic triangular distribution, while the residual internal stress can be released through the bending of dislocation lines. With the increase of the modulation period, the maximum stress shows an upward trend, while the flow stress declines. It was found that the maximum stress and flow stress of the sample with a cube-on-cube interface is higher than that of the sample with a twin interface, which is different from the traditional cognition. This unusual phenomenon is mainly attributed to the discontinuity and unevenness of the twin boundaries caused by the extremely severe lattice mismatch.in Cu/Pd multilayered film is unquestionable. Since Cu/Pd multilayered films were first found to have excellent mechanical performance, such as an increase of strength and hardness, in this work, it will be selected as a representative to study the mechanical properties of multilayered films [16][17][18][19][20].The modulation period (λ) and modulation ratio (η) are the thickness of a representative unit in a multilayered film and the ratio of the layer thickness of each constituent, respectively [21,22]. The change of λ and η may induce a change of interface proportion and the space for dislocation movement. Moreover, the grain boundary-dominated deformation mechanism may also vary with the variation of λ and η. For example, as λ decreases, the dominant deformation mechanisms in metallic multilayered films may vary from "dislocation pile-up" to "confined layer slip", or to "interface crossing" [21]. With the decrease of λ, the strengthening caused by the dislocation pile-up is weakened due to fact that a large number of dislocations between the interfaces can be stored in layers. However, the strengthening induced by the glide of single dislocations confined by interfaces ("confined layer slip") or the weakening resulting from dislocation crossing the interface ("interface crossing") dominate would play a leading role. Therefore, λ and η have significant effects on the mechanical properties of a multilayered film. This has an essential guiding significance to establish the relationship between the mechanical performance and modulation parameters for the design and development of high-performance multilayered films with excellent mechanical properties. In this work, we will mainly focus on the effects of λ on mechanical properties.Last but not least, interfaces, the transition zone between two components in nanostructured metallic multilayered films, can act as sources of defects, sin...

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Ultra-high local plasticity in high-strength nanocomposites

et al. 2020

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Deformation response of cube-on-cube and non-coherent twin interfaces in AgCu eutectic under dynamic plastic compression

Cited by 14 publications

References 35 publications

Inelastic strain recovery of a dynamically deformed unidirectional Ag Cu eutectic alloy

Inelastic strain recovery of a dynamically deformed unidirectional Ag Cu eutectic alloy

Inapparent Strengthening Effect of Twin Interface in Cu/Pd Multilayered Films with a Large Lattice Mismatch

Ultra-high local plasticity in high-strength nanocomposites

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