Title: High temperature nano-indentation of tungsten: modelling and experimental validation
Authors: XIAO XIAZITERENTYEV D.RUIZ MORENO ANA MARIAZINOVEV ABAKAEV AZHURKIN E. E.
Citation: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING vol. 743 p. 106-113
Publisher: ELSEVIER SCIENCE SA
Publication Year: 2019
JRC N°: JRC113299
ISSN: 0921-5093 (online)
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC113299
DOI: 10.1016/j.msea.2018.11.079
Type: Articles in periodicals and books
Abstract: It is very well known that tungsten material is intrinsically brittle at room temperature, and characterization of its ductile properties by conventional mechanical tests is possible only above ductile to brittle transition temperature (DBTT) i.e. above 500-700K. However, the design of tungsten-based components often require the knowledge of constitutive laws below DBTT. Here, we carried out instrumented hardness measurements in the temperature range of 273-673K 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 273-1273K. The validation of the constitutive laws was realized by crystal plasticity finite element model (CPFEM), applied to simulate the nano-indentation loading curves. Distribution of stress and strain under indenter was also studied by 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 microstructural features generated by e.g. irradiation by energetic particles, plasma exposure or thermo-mechanical treatment.
JRC Directorate:Nuclear Safety and Security

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