Microstructural evolution of Cu/W nano-multilayers filler metal during thermal treatment

Li, Hong; Xing, Zeng-cheng; Li, Bo-jin; Liu, Xusheng; Lehmert, Benjamin; Manka, M.; Li, Zhuoxin; Tillmann, Wolfgang

doi:10.1016/j.vacuum.2022.111007

Cited by 7 publications

(2 citation statements)

References 10 publications

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“…than the mean surface energy of the particles formed on the NML surface. [8] The surface outflow phenomenon has been thoroughly investigated in NMLs of various material systems (immiscible or semimiscible), e.g., Cu/W, [9,23] Ag/AlN, [24] Ag-Cu/AlN, [25] Ag-Ge/ AlN, [16] Al-Si/AlN, [26] and Cu/AlN-Al 2 O 3 [27] NMLs. Typically, the outflowing material is a metal phase with a lower melting point (compared to other constituents of an NML) and high diffusion mobility.…”

Section: Doi: 101002/pssa202300876mentioning

confidence: 99%

Ag Surface Outflow Kinetics in Ag/AlN Nanomultilayers

Druzhinin,

Janczak‐Rusch,

Cancellieri

2024

Physica Status Solidi (a)

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The heat‐induced microstructure evolution of nanomultilayers (NMLs) with metallic components is widely studied due to its critical importance in ensuring the reliable application of these nanomaterials. The thermal degradation of NMLs is controlled by mass transport of one of the NML components from the NML volume to its surface. The outflow occurs at temperatures well below the melting point of metal, offering new opportunities for the engineering of innovative NML‐based brazing fillers. A combined experimental‐modeling approach for the quantitative analysis of silver (Ag) outflow kinetics in Ag/AlN NMLs is presented. The method is based on in situ monitoring of the X‐ray diffraction intensity evolution of Ag acquired from the near‐surface region of NML (grazing incidence geometry) upon annealing in the temperature range of 230–425 °C (atmosphere of N2). The experimental data are compared to model predictions of Ag diffusion. It is assumed that Ag diffusion is driven by the relaxation of residual stresses in Ag nanolayers. Due to the multilayer geometry, the surface outflow kinetics are mainly defined by the kinetics of Ag diffusion along Ag/AlN interphase boundaries. The parameters defining the Ag surface outflow kinetics, i.e., diffusion coefficients and activation energy for diffusion, are derived.

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Section: Doi: 101002/pssa202300876mentioning

confidence: 99%

Ag Surface Outflow Kinetics in Ag/AlN Nanomultilayers

Druzhinin,

Janczak‐Rusch,

Cancellieri

2024

Physica Status Solidi (a)

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“…Upon annealing, grooving of GB is a possible way to minimize the internal energy. This brings to the transformation of the NML into a nanocomposite (NC) [13,14]. Prior to NML degradation, i.e., in the temperature range of 400 -600 °C, the Cu/W NML system first releases the accommodated residual stresses in the Cu and W nanolayers (while maintaining the multilayer structure) [15].…”

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confidence: 99%