| AVS 62nd International Symposium & Exhibition | |
| Atom Probe Tomography Focus Topic | Monday Sessions |
| Session AP+AS-MoA |
| Session: | Current and New Research Fields for Applications of Atom Probe Tomography |
| Presenter: | Sophie Primig, University of New South Wales, Australia |
| Authors: | S. Primig, University of New South Wales, Australia K. Babinsky, Montanuniversität Leoben, Austria P. Haslberger, Montanuniversität Leoben, Austria C. Hofer, Montanuniversität Leoben, Austria D. Lang, Montanuniversität Leoben, Austria C. Turk, Montanuniversität Leoben, Austria |
| Correspondent: | Click to Email |
Despite the increasing interest in atom probe tomography, this technique has so far almost exclusively been applied for chemical analyses of materials at the atomic scale. As nowadays the frontiers of material science are more and more being pushed towards the nanostructure, advanced comprehensive characterization techniques which provide both chemical and crystallographic information are required. For the crystallographic analysis of atom probe specimens several complementary techniques such as transmission electron microscopy have been applied that all have their advantages and drawbacks. Different approaches try to establish crystallographic information directly from the atom probe data itself which is still computationally challenging and not always possible. Another recently proposed straightforward way of quickly obtaining crystallographic information is the application of transmission Kikuchi diffraction on atom probe tips prior to the atom probe experiment. This procedure has so far only been successfully applied for positioning of grain boundaries close to the apex of the tips via focused ion beam milling.
The aim of the current study is to show applications of transmission Kikuchi diffraction on atom probe specimens of high performance materials and to demonstrate the strengths as well as the limits of these two complementary techniques. Four examples are shown which include boron segregation at prior austenite grain boundaries in a heat treatable steel, interlath retained austenite films with cementite in a bainitic steel, molybdenum carbides in a molybdenum alloy, and the preparation of grains with well-defined crystal directions in the tip axis of an iron-cobalt-molybdenum alloy.