Regensburg 2007 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 39: Mechanical properties I
MM 39.8: Vortrag
Donnerstag, 29. März 2007, 18:00–18:15, H6
Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS -ICP-MS) in the high resolution study of trace elements distribution patters in selected materials — Watling John1 and •Chaudhri . Anwar2 — 1Centre for Forensic Sciences, Uni. of Western Australia, Perth — 2Klinikum Nürnberg-Süd, 90471 Nürnberg
One of the major problems for identifying the chemical reasons for fracture or failure of metals and metal alloys is the lack of accurate chemical data for metal concentrations across the failure site. Most modern analytical techniques require the use of relatively large sample masses to ensure accurate multi-element data. The fact that large samples have to be taken often means that there is a significant contamination of the relevant sample with material spatially associated with, but not causative in, the failure. This fact excludes the use of chemical analytical techniques to ascertain the causes of any failure. Techniques such as Scanning Electron Microscopy coupled with Energy Dispersive X-ray Analysis (SEM - EDXRA) can provide micron resolution analytical data. However, the detection limit of the technique is large and as such may not be sufficiently sensitive to identify the true cause of failure. Detection limits of LA-ICP-MS, an analytical technique making use of laser light to ablate a solid sample matrix, are in the sub parts per million level.To illustriate the usefulness of the technique some examples of elemental distributions in different materials are presented.