Evolution of interfacial structures and creep behavior of Cu/Ta multilayers at room temperature

Wei, Mingzhen; Cao, Zhenhua; Shi, Jun; Pan, Gencai; Xu, Linli; Meng, Xiangkang

doi:10.1016/j.msea.2015.08.068

Cited by 16 publications

(12 citation statements)

References 32 publications

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“…A further decrease of L led to a significant drop of n below the values found for all other cases. Similar trends were also reported for other nano-multilayers combining fcc/hcp [71] and fcc/fcc [72] structures. Such tendency matches well with that exhibited by the hardness (Fig.…”

Section: Indentation Creepsupporting

confidence: 88%

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

Callisti

Polcar

2017

Acta Materialia

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A combination of transmission electron microscopy analyses and nanomechanical measurements was performed in this study to reveal deformation and strengthening mechanisms occurring in sputtered Zr/Nb nanoscale metallic multilayers (NMMs) with a periodicity (L) in the range 6 -167 nm. Electron diffraction analyses revealed a change in the crystallographic orientation of α-Zr when L ≤ 27 nm, while Nb structure retained the same orientations regardless of L. For L > 60 nm, the strengthening mechanism is well described by the Hall-Petch model, while for 27 < L < 60 nm the refined CLS model comes into picture. A decrease in strength is found for L < 27 nm, which could not be simply explained by considering only misfit and Koehler stresses. For L ≤ 27 nm, plastic strain measured across compressed NMMs revealed a change in the plastic behaviour of α-Zr, which experienced a hard-to-soft transition. At these length scales, the combination of two structural factors were found to affect the strength. These relate to the formation of weaker interfaces which extend the effective distance between strong barriers against dislocation transmission, thus producing a softening effect. 1The second effect relates to the crystallographic orientation change exhibited by α-Zr for L < 27 nm with a consequent change of the dominant slip system. The actual strength at these smaller length scales was effectively quantified by taking these structural aspects into account in the interface barrier strength model.

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Section: Indentation Creepsupporting

confidence: 88%

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

Callisti

Polcar

2017

Acta Materialia

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“…A sharp decrease can be obviously observed when h is in the range of 5-10 nm. It comes from the phase transformation in Ta layers, which has been reported in our previous work [31]. The strength in Ag/Cu multilayers increases with decreasing h in the range of 5-100 nm and softens at h \ 5 nm, while in Ag/Nb multilayers, the strength increases with decreasing h and shows a sharply rising trend even when h decreases to 1 nm.…”

Section: Resultssupporting

confidence: 74%

“…In our previous works [4,31], we have reported that the tetragonal b-Ta and cubic a-Ta coexist in Ta layers when h [ 5 nm, while only a-Ta forms when h B 5 nm, which may be the reason why the hardness/ strength drops sharply with decreasing h from 10 to 5 nm. In fact, the crystal a-Ta forms at some special sites with straight interface and generates exactly on the neat Cu(111) plane [31]. The selected area electron diffraction (SAED) pattern of the Cu/Ta multilayer with h = 5 nm is shown in the inset of Fig.…”

Section: Resultsmentioning

confidence: 88%

“…A comparison of the systems studied is shown in Table 1. In our previous work, we have reported the ultrahigh strengthening behavior in Ag/Nb multilayers [30] and the abnormal softening behavior in Cu/Ta multilayers [4,31]. However, the further researches are still needed on how the characteristics of interfaces, including the crystallinity, the structural discontinuity and crystal orientation between layers, affect the mechanical properties of multilayers.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial Structures Governed Plastic Deformation Behaviors in Metallic Multilayers

Wei

Cao

Meng

2016

Acta Metall. Sin. (Engl. Lett.)

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In this work, we have investigated the mechanical properties of Cu/Ta, Ag/Cu and Ag/Nb multilayers with different heterogeneous interfaces. The results suggest that when individual layer thickness (h) is larger than 5-10 nm, the hardness/strength of three different multilayer systems has the similar length scale effect with decreasing layer thickness, while when h B 5 nm, the three multilayer systems show remarkably different plastic deformation behaviors. The strength curves exhibit the variation trends of unchanging, softening and increasing corresponding to Cu/Ta, Ag/Cu and Ag/Nb multilayers, respectively. The microstructure analysis shows that three kinds of multilayers have totally different interfacial structures, which lead to the different strengthening or softening mechanisms.

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“…Noted that the applied uniaxial loading would evolve with the deformation, which became a non-uniaxial one as the crack opening increased. (Figure 1d and f), different from the amorphous ribbons observed in Cu/Ta multilayers [15] and Cu-Nb-Ag composite wires [16]. The mismatch between {112} Cu and {110} V planes across the sharp interfaces is calculated to be 30.8%, while the mismatch is calculated to be 48.4% between {113} Cu and {110} ITZ planes across the ITZs, and 3.6% between {110} V and {110} ITZ planes across the ITZs.…”

Section: Experimental Methodsmentioning

confidence: 81%

Role of interfacial transition zones in the fracture of Cu/V nanolamellar multilayers

Wei

Zheng

Zhang

et al. 2020

Materials Research Letters

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Plastic deformation and fracture behavior of Cu/V nanoscale metallic multilayers (NMMs) were systematically investigated through in situ transmission electron microscopy testing. Two different types of interfaces: sharp interfaces and interfacial transition zones (ITZs), formed in the as-fabricated Cu/V NMMs. Upon deformation, sharp interfaces and ITZs exert distinct influences on the fracture behavior of Cu/V NMMs. Sharp interfaces can impede the crack propagation by deflecting the crack propagation and blunting the crack tip, while the ITZs can induce microcracks and facilitate the fracture process. These findings shed light on the important roles of interface structures in the deformation of a broad class of NMMs. IMPACT STATEMENT In situ nanomechanical testing reveals critical roles of interface structures on the fracture of Cu/V NMMs, where sharp interfaces imped and deflect cracks but interfacial transition zones facilitate the fracture greatly.

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Evolution of interfacial structures and creep behavior of Cu/Ta multilayers at room temperature

Cited by 16 publications

References 32 publications

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

Interfacial Structures Governed Plastic Deformation Behaviors in Metallic Multilayers

Role of interfacial transition zones in the fracture of Cu/V nanolamellar multilayers

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