Abstract
Knowledge of mechanical properties of the tungsten surface region is extremely important for its application as
first wall materials in plasma-facing components for nuclear fusion devices (e.g. ITER). Since tungsten is intrinsically
brittle at room temperature, characterization of its ductile properties is possible only above the socalled
ductile-to-brittle transition temperature (DBTT), which is above 500–700 K. This is why the development
and qualification of instrumented hardness measurements at elevated temperature is an important task to enable
the characterization of tungsten properties after exposure to heat shocks, plasma beam and ion irradiation,
which all together mimic the actual operation conditions of nuclear fusion. We have performed nanoindentation
measurements on tungsten in the constant stiffness mode using Bruker stage developed for high temperature
operation with oxygen protective environment. Commercially pure tungsten of ITER specification is studied in
the as-produced and as-recrystallized conditions to deduce the impact of the texture and forging on the hardness.
The obtained results are analysed by means of crystal plasticity finite element method (CPFEM) model to subtract
the constitutive laws for the elasto-plastic deformation and derive the strengthening term attributed to the
contribution coming from statistically stored dislocations and grain boundaries.
Original language | English |
---|---|
Article number | 105222 |
Pages (from-to) | 1-12 |
Number of pages | 12 |
Journal | International Journal of Refractory Metals & Hard Materials |
Volume | 89 |
DOIs | |
State | Published - 22 Jun 2020 |