Micro-mechanical investigation of the thermo-mechanical properties of micro-architectured tungsten coatings

Jiao, Quan; Cheng, Jiahao; Sim, Gi-Dong; Ghosh, Somnath; El-Awady, Jaafar A.

doi:10.1016/j.jmps.2021.104326

Title: Micro-mechanical investigation of the thermo-mechanical properties of micro-architectured tungsten coatings

Journal Article · Tue Feb 09 00:00:00 EST 2021 · Journal of the Mechanics and Physics of Solids

DOI:https://doi.org/10.1016/j.jmps.2021.104326· OSTI ID:1771908

Jiao, Quan ^[1];

^[2];

^[3];

^[1];

^[1]

Johns Hopkins Univ., Baltimore, MD (United States)
Johns Hopkins Univ., Baltimore, MD (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Johns Hopkins Univ., Baltimore, MD (United States); Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)

The thermo-mechanical response of micro-architectured tungsten coatings is characterized in the temperature range of 293 to 673 K using both in situ micro-compression experiments inside a scanning electron microscope (SEM) as well as image-based crystal plasticity finite element method (CPFEM) simulations. The experiments were conducted on micropillar-like specimens that were focus ion beam milled into the coatings, while the simulations were conducted on columnar-grained micropillar simulation cells constructed based on the statistics of the coating’s microstructure. The experimental results show that the stress–strain response and deformation mode exhibit a strong temperature-dependence. At room temperature, catastrophic failure is observed shortly after yield and is manifested in the form of intergranular fracture and buckling of individual columnar grains. With increasing temperature, this catastrophic failure is gradually suppressed and the material exhibits a steadier strain hardening response at 693 K. The CPFEM simulations are also shown to be in good agreement with the experimental results, and these simulations indicate that the material response is strongly influenced by the local crystallographic anisotropy and microstructure inhomogeneity. Furthermore, the simulations capture the underlying mechanisms that control the temperature-dependent transition in deformation mode. The current results highlight that the micro-architectured microstructure offers a great combination of excellent mechanical strength and structural integrity at elevated temperatures, which is of importance for high temperature applications.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: AC05-00OR22725; FA9550-18-1-0071

OSTI ID:: 1771908

Alternate ID(s):: OSTI ID: 1776122

Journal Information:: Journal of the Mechanics and Physics of Solids, Vol. 150; ISSN 0022-5096

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Micro-architectured coatings
tungsten
thermo-mechanical properties
intergranular fracture
micro-compression
crystal plascticity

Title: Micro-mechanical investigation of the thermo-mechanical properties of micro-architectured tungsten coatings

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