TY - JOUR
T1 - High temperature nano-indentation of tungsten: Modelling and experimental validation
AU - Xiao, Xiazi
AU - Terentyev, Dmitry
AU - Ruiz, A.
AU - Zinovev, Aleksandr
AU - Bakaev, Alexander
AU - Zhurkin, Evgeni E.
N1 - Score=10
PY - 2018/11/16
Y1 - 2018/11/16
N2 - It is very well known that tungsten is intrinsically brittle at room temperature, and the characterization of its
ductile properties by conventional mechanical tests is possible only above the ductile-to-brittle transition temperature
(DBTT), i.e. above 500–700 K. However, the design of tungsten-based components often requires the
knowledge of constitutive laws below the DBTT. Here, we carried out instrumented hardness measurements in
the temperature range of 300–691 K by nano-indentation. The obtained results are used to extend a set of
constitutive laws for the plastic deformation of tungsten, developed earlier on the basis of tensile data, which
now covers the temperature range of 300–1273 K. The validation of the constitutive laws was realized by the
crystal plasticity finite element method (CPFEM) model, which was applied to simulate the nano-indentation
loading curves. The distribution of stress and strain under the indenter was also studied by the CPFEM to bring
an insight on the extension of the plastic zone in the process of the indentation, which is of crucial importance
when nano-indentation is used to resolve the microstructural features generated by e.g. irradiation by energetic
particles, plasma exposure or thermo-mechanical treatment.
AB - It is very well known that tungsten is intrinsically brittle at room temperature, and the characterization of its
ductile properties by conventional mechanical tests is possible only above the ductile-to-brittle transition temperature
(DBTT), i.e. above 500–700 K. However, the design of tungsten-based components often requires the
knowledge of constitutive laws below the DBTT. Here, we carried out instrumented hardness measurements in
the temperature range of 300–691 K by nano-indentation. The obtained results are used to extend a set of
constitutive laws for the plastic deformation of tungsten, developed earlier on the basis of tensile data, which
now covers the temperature range of 300–1273 K. The validation of the constitutive laws was realized by the
crystal plasticity finite element method (CPFEM) model, which was applied to simulate the nano-indentation
loading curves. The distribution of stress and strain under the indenter was also studied by the CPFEM to bring
an insight on the extension of the plastic zone in the process of the indentation, which is of crucial importance
when nano-indentation is used to resolve the microstructural features generated by e.g. irradiation by energetic
particles, plasma exposure or thermo-mechanical treatment.
KW - CPFEM
KW - Tungsten
KW - Dislocations
KW - Hall-Petch
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/32824556
U2 - 10.1016/j.msea.2018.11.079
DO - 10.1016/j.msea.2018.11.079
M3 - Article
SN - 0921-5093
VL - 743
SP - 106
EP - 113
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
ER -