Research objectives and content
Recent progress in the technique of positron annihilation measurements enables a non-destructive, highly sensitive detection of microstructure changes during fatigue. The proposed project shall evaluate the potential of this new method as a tool of non-destructive fatigue damage characterization, the possibilities of residual fatigue lifetime assessment and its potential in non-destructive testing. To this end a series of in-situ positron lifetime measurement campaigns during the fatigue of some well-known engineering materials (AISI 316 L stainless steel, aluminium alloy Al 2024) in different microstructural states is planned in order to obtain the positron lifetime as a function of stress amplitude and number of fatigue cycles. The changes in positron lifetime will be related to microstructural changes identified by electron microscopy (TEM, SEM), X-ray diffraction and metallography. A relation will be set up between the microstructural changes, significant changes in positron lifetime and the residual lifetime estimated from the Wvhler curve.
Training content objective benefit and expected impact)
The research training grant would offer the possibility to use the ideal combination of research facilities at the IAM in order to develop a method of nuclear solid state physics into a potential tool for industrial application. The presence of experienced researchers and the integration of the IAM in European applied research ensure the success of the proposed project. The scientific training in the techniques of microstructure analysis (electron microscopy, X-ray diffraction, metallography) and mechanical testing available at the IAM together with the experience of working in an international research organization would be a unique possibility for me to gain an excellent qualification for a career in applied science.
Links with industry / industrial relevance (22)
After first results are obtained, links with industry interested in plant inspection, automotive and aircraft industry shall be established.