期刊
SCRIPTA MATERIALIA
卷 199, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113866
关键词
Multilayers; Interface stress; Thermal grooving; Residual stresses; Diffusion
类别
资金
- Russian Foundation for Basic Research (RFBR) [19-33-90125]
The study reveals the influence of interface stresses on the energy of Cu/W interphase boundaries during the thermal degradation of Cu/W nano-multilayers, and suggests that the thermal stability of immiscible NML systems and other types of immiscible nanomaterials can be tailored by controlling the interface stress level.
The phenomenon of non-equilibrium grain boundaries and interphase boundaries is very important for materials science. They can be found in materials after sever plastic deformation, rapid quenching etc. In the present work, the influence of interface stresses on the energy of Cu/W interphase boundaries during the thermal degradation of Cu/W nano-multilayers is revealed. As rationalized on the basis of a modified Young equation, the large interface stress in the as-deposited NML decreases the thermodynamic driving force for the thermal grooving of W/W GBs. The experimentally derived interface stress linearly decreases with increasing annealing temperature. The onset of NML degradation, as initiated by grooving, only sets in after complete relaxation of the interface stress at around 650 degrees C. The thus obtained fundamental knowledge may be exploited to tailor the thermal stability of immiscible NML systems and other types of immiscible nanomaterials by controlling the interface stress level during material synthesis. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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