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High temperature nanoindentation of tungsten: Modelling and experimental validation
International Journal of Refractory Metals & Hard Materials ( IF 3.6 ) Pub Date : 2020-02-22 , DOI: 10.1016/j.ijrmhm.2020.105222
D. Terentyev , Xiazi Xiao , S. Lemeshko , Ude Hangen , E.E. Zhurkin

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 so-called 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.



中文翻译:

钨的高温纳米压痕:建模和实验验证

钨表面区域的机械性能知识对于将其用作核聚变设备(例如ITER)的等离子组件中的第一壁材料至关重要。由于钨在室温下本质上是脆性的,因此只有在所谓的韧性至脆性转变温度(DBTT)(高于500–700 K)以上时,才能表征其韧性。这就是为什么仪器的开发和鉴定高温下的硬度测量是一项重要任务,能够表征暴露于热冲击,等离子束和离子辐照后的钨特性,这些特性共同模拟了核聚变的实际运行条件。我们使用为氧气保护环境下的高温操作开发的布鲁克平台,以恒定刚度模式对钨进行了纳米压痕测量。在生产和再结晶的条件下研究了ITER规格的商业纯钨,以推断出织构和锻造对硬度的影响。利用晶体塑性有限元方法(CPFEM)模型对获得的结果进行分析,以减去弹塑性变形的本构律,并得出归因于统计存储的位错和晶界的贡献的强化项。在生产和再结晶的条件下研究了ITER规格的商业纯钨,以推断出织构和锻造对硬度的影响。利用晶体塑性有限元方法(CPFEM)模型对获得的结果进行分析,以减去弹塑性变形的本构律,并得出归因于统计存储的位错和晶界的贡献的强化项。在生产和再结晶的条件下研究了ITER规格的商业纯钨,以推断出织构和锻造对硬度的影响。利用晶体塑性有限元方法(CPFEM)模型对获得的结果进行分析,以减去弹塑性变形的本构律,并得出归因于统计存储的位错和晶界的贡献的强化项。

更新日期:2020-02-22
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