iMAT Lecture/Specialized iNANO Lecture: High Entropy Alloys Investigated by Neutron and X-Ray Scattering

Martin Sahlberg, Assoc. Prof., Department of Chemistry, Ångström Laboratory, Uppsala University, Sweden (Host: Torben R. Jensen)

2018.03.19 | Marianne Sommer

Date Wed 11 Apr
Time 16:15 17:00
Location iNANO Auditorium, bldg. 1593 room 012, Gustav Wieds Vej 14, 8000 Aarhus C

HIGH ENTROPY ALLOYS INVESTIGATED BY NEUTRON AND X-RAY SCATTERING

Martin Sahlberg

Department of Chemistry - Ångström Laboratory, Uppsala University, Sweden

e-mail: martin.sahlberg@kemi.uu.se

Only a decade after their discovery, high entropy alloys (HEAs) have made great impact in science. Several materials, inspired by the results on metallic alloys have lately been introduced, e.g. high entropy nitrides and oxides. These HEAs have been shown to have unique properties like exceptional tensile strength, hydrogen storage capacity, magnetocaloric effect etc. Many of these unique properties are believed to originate from the distorted structure leading to a high internal strain in HEAs. The research is focused on developing an understanding of strain effects in high entropy alloys and its potential for developing even higher performing alloys.

The Research covers synthesis and evaluation of high entropy alloys as advanced materials, with emphasis on physical properties. This includes predicting materials properties, designing new compounds, determining internal strain, optimizing microstructure, advanced characterization etc. During this lecture, I will give a general introduction to high entropy alloys in general as well as the use of these in hydrogen storage, followed by a discussion of some recent results from my group and others. Focus will be on the use of X-ray and Neutron scattering for the characterization. The talk will finish with some perspectives, challenges and the future prospects of this research field.

  1. Martin Sahlberg, Dennis Karlsson, Claudia Zlotéa and Ulf Jansson. “Superior hydrogen storage in high entropy alloys.” Scientific Reports 6, Article number: 36770 (2016). doi:10.1038/srep36770
  2. D. Karlsson, *, J. Cedervall, C. Zlotea, K.T. Møller, T. C. Hansen, J. Bednarčík, M. Paskevicius, T. R. Jensen, U. Jansson, M. Sahlberg. “Structure and hydrogenation properties of an HfNbTiVZr high-entropy alloy”, Inorganic Chemistry 2018 57 (4), 2103-2110

 

Martin Sahlberg, Assoc. Prof

Department of Chemistry - Ångström Laboratory

The research is generally focused on the synthesis and characterisation of novel bulk materials for energy storage and conversion, which is stuied in particular with different diffraction techniques, but also including absorption/desorption measurements and electrochemical methods. Main applications are in the hydrogen storage and battery areas well as magnetic materials.

 

Biography

Martin Sahlberg is a Senior Lecturer at the Department of Chemistry – Ångström Laboratory. He got his PhD in 2009 from Uppsala University, focusing on hydrogen storage in light-metal alloys. Dr. Sahlberg is Chairman for the Uppsala University Centre for Neutron Scattering and also the secretary for the Swedish Neutron Scattering Society. He is the the Swedish PI for the Nordic Neutron Science Programme, NNSP, research school and is heavily involved in building and expanding the Nordic neutron scattering community.

Lecture / talk