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Seminar - Mechanical Microscopy at the Oxford MBLEM lab by Professor Alexander M. Korsunsky
日期:2016 年 03 月 15 日 ( 星期二)
Time:11:00 am – 12:00 pm
Venue:EF305

Abstract:

The Multi-Beam Laboratory for Engineering Microscopy (MBLEM) is a new micro-mechanical testing facility based in Oxford, UK setup by Professor Alexander Korsunsky in early 2014 (www.korsunsky.org) [1], established to combine the fields of microscopy, synchrotron radiation and neutron scattering to investigate a broad range of materials and systems. This presentation gives an overview of some recent studies and publications from the MBLEM team: Microscale residual Stress analysis using the ring-core Focused Ion Beam (FIB) milling and Digital Image Correlation (DIC) approach [2-10]. Our recent work has been focused on the error analysis associated with the ring-core FIB milling and DIC technique [5-7] as well as at the extensions for intragranular [6, 8], depthresolved [9] and laterally resolved micro-scale stress analysis [10]. Understanding failure at the Yttria Partially Stabilised Zirconia (YPSZ)-porcelain interface in dental prostheses [11-14]. To improve the understanding of porcelain chipping behaviour, near-interface region was analysed by experimental techniques including EDS, TEM and micropillar compression [11]. Bulk mechanical tests of the porcelain [12, 13] and new experimental techniques have been developed to assess the single crystal stiffnesses of YPSZ from polycrystal neutron diffraction data [14]. Understanding the cascade of electrochemical and mechanical damage processes in Li-ion battery cathodes [15-18]. Recent studies explored the electromechanical damage processes using a broad range of experimental techniques including FIB-SEM tomography [15], Raman and X-ray absorption spectroscopy [16] as well as FIB-SEM/Time Of Flight - Secondary Ion Mass Spectroscopy (TOF-SIMS) and correlative microscopy techniques [17]. This analysis has resulted in improved modelling of the internal stresses and damage in Li-ion battery cathodes [18]. Micro-scale deformation and fracture of advanced aerospace matls [10, 19-21]. Recent studies at MBLEM include XRD mapping of the residual stress state in carbon fibre reinforced titanium alloys [19] and EBSD analysis of fatigue crack propagation in an aluminium alloy. Micro-scale FIB-DIC quantifies residual stresses in additive laser manufactured turbine blades [10], shot peened surfaces [20], and due to fatigue in single crystal superalloys [21]. (* references available on request)

Bio-sketch:

Professor Alexander Korsunsky is a world-leader in engineering microscopy of materials systems and structures for optimisation of design, durability and performance. He leads the Centre for In situ Processing Science (CIPS) based in the Research Complex at the nearby Harwell Oxford campus. He consults Rolls-Royce plc on matters of residual stress and structural integrity, and is Editor-in-Chief of Materials & Design, a major Elsevier journal (2014 impact factor 3.501).