An X-ray diffraction study on Cu-Ti metallic multilayers

Liu, W; Hu, An; Jiang, S. S.; Qiu, Yumin; Liu, W H; Wu, Zhongtao

doi:10.1088/0953-8984/1/45/002

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…The asymmetrical satellite peaks distribution around the (0002)Zr texture for L = 12 nm is attributed to a combination of factors such as layer thickness variation and inhomogeneous strain distribution 8 across interfaces [64], as will be discussed later. On the other hand, for L = 6 nm, peaks associated with the main texture (indicated as order "0" peak in Fig.…”

Section: As-deposited Structuresmentioning

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: As-deposited Structuresmentioning

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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“…1 shows the XRD pattern of the multilayer irradiated with different fluences. The satellite peak observed for the as-deposited multilayer at 2θ ≈ 36.5° was not found for the irradiated samples, which might suggest structural changes at the interfaces or in the constituent layers [25]. In order to highlight possible peaks intensity evolutions, the XRD patterns of irradiated samples were normalised with respect to the XRD pattern of the asdeposited multilayer.…”

Section: Structure After Irradiationmentioning

confidence: 99%

“…interfacial mixing, thickness fluctuation of each individual layer, when one or both constituent elements are amorphous or when the boundary layer is amorphous [25]. The Cu-W system with an equiatomic composition has a positive heat of mixing (ΔH = + 36 kJ calculated by the Miedema's model [29]), denoting a high immiscibility both in liquid and solid state.…”

Section: Structural Changes After Irradiationmentioning

confidence: 99%

Bubbles formation in helium ion irradiated Cu/W multilayer nanocomposites: Effects on structure and mechanical properties

Callisti

Karlı́k

Polcar

2016

Journal of Nuclear Materials

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This study investigates the effects of He bubbles on structural and mechanical properties of sputter-deposited Cu/W multilayers. A multilayer with a periodicity of 10 nm was deposited and subjected to helium ion irradiation with two different fluences. He bubbles formed mostly in Cu layers and their distribution was affected by He concentration and radiation damage. According to SRIM calculations, in low He concentration regions bubbles formed mostly along interfaces, while more homogeneously distributed bubbles were found in Cu layers and along columnar grain boundaries in higher He concentration regions. We suggest that the capability of interfaces to annihilate point defects is weakened by the He bubbles shielding effect. Nanoindentation tests revealed a hardness decrease amounting to ~ 0.5 and ~ 1 GPa for low and high fluences, respectively. The observed softening effect is attributed to He storage-induced changes in residual stresses and columnar grain boundary/interfacial sliding facilitated by He bubbles.

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X‐ray diffraction behaviour of W/Ti superlattices

Pan

Feng

Jin

et al. 1996

Physica Status Solidi (b)

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The structural properties of periodic and quasiperiodic W/Ti superlattices have been irivestigat,cd by means of X-ray diffraction. Intensity attenuation of even ordered peaks occurs in the spectra of W/Ti periodic superlattices with near-equal-layer thicknesses. This phenomenon is theoretically explained. Two series of quasiperiodic (Fibonacci) samples are prepared, one with thickness ratio d A / d R = 5 , and the other da/du = l / t . X-ray diffraction results of these quasiperiodic superlattices are discussed and compared. The possible application of Fibonacci films as optical elements in the soft X-ray region is discussed. Flirthermore some X-ray diffraction spectra are simulated by computer calculation in order to understand the detailed structures. The calculated results are in good agreement with measured ones.

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An X-ray diffraction study on Cu-Ti metallic multilayers

Cited by 8 publications

References 9 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

Bubbles formation in helium ion irradiated Cu/W multilayer nanocomposites: Effects on structure and mechanical properties

X‐ray diffraction behaviour of W/Ti superlattices

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