© M. M. Garlapati

Double Strike !

Dr. Mohan Muralikrishna Garlapati, Postdoc in AG Wilde, has obtained two exceptional awards: he has received the 2021 „Best Thesis“ award of IIT Madras at Chennai in India for his work on high entropy alloys. Mohan performed a part of his thesis work at our institute, working closely together with Apl.-Prof. Sergiy Divinski. Mohan performed the main part of his thesis work at IIT Madras in the group of Prof. B.S. Murty with whom our group closely collaborates. The thesis award of IIT Madras is a highly prestigious price, since IIT Madras is the top elite institution in the area of materials science and metallurgy in India, making the competition for that award truly fierce. We are very happy that Mohan was selected as awardee this year and we feel that with Mohan, the award has been given to the right person.

Almost at the same time, Mohan has been awarded with a research fellowship of the Alexander von Humboldt foundation for 24 months. This fellowship for young scientists from abroad is not only highly prestigious, but also highly competitive. It allows Mohan to work independently on the scientific project that he defined for the application. We are lucky and very happy to have Mohan in our group for the completion of his fellowship project on High Entropy Oxides that will be undertaken in close collaboration with Prof. Horst Hahn from KIT in Karlsruhe, who acts as Co-host of Mohan’s fellowship.
We congratulate Mohan for his great success and we are looking forward to continue working with him.

© IMP

Watching Atoms Jump

In a paper just published in the reputed journal Advanced Functional Materials, scientists from the Wilde group were able to directly observe and quantitatively measure for the first time the local dynamics of atomic rearrangements at room temperature in an amorphous solid [K. Spangenberg et al., Adv. Funct. Mater. 2021, 31, 2103742; DOI: 10.1002/adfm.202103742]. Such rearrangement processes in glasses contribute significantly to their wide range of applications since they represent the elementary process for the possibility to set material properties. Thereby, the non-crystalline structure of glasses allows property changes (e.g. packing density) which are not possible in the presence of a crystal lattice. To date, however, large gaps exist in understanding the underlying atomic mechanisms of this so-called ‘structural relaxation’. A novel method, which is based on the application of transmission electron microscopy, promises a completely new and direct access.

For this purpose, time series of dark-field images are recorded for application of the so-called electron correlation microscopy. The subsequent analysis of these time series includes calculating the temporal correlation of intensities in the dark-field images.
The resulting decays are fitted by a stretched exponential function (taking into account an ensemble of different activation energies), leading to characteristic fitting parameters - as such, the decay time τ. By analyzing each pixel in the micrograph time series, the material’s typical time and length scales are locally resolved and their spatial distribution is presented in τ(x,y)-maps.


In this research work, which was funded by the German Research Foundation, the dynamics of atomic rearrangement in metallic glass nanowires made of FeNiP are investigated. This fascinating class of material offers ideal prerequisites as a model system for disordered systems. By means of electron correlation microscopy, timescales of the heterogenous dynamics of a glassy FeNiP alloy are locally resolved, revealing a decoupling into two different processes at room temperature. Besides the first quantitative and direct observation of local rearrangements and their characteristic timescale at temperature well below the glass transition, this is an important result for expanding our knowledge of the complex dynamics in materials with disordered atomic structure. An in-depth understanding of these processes and mechanisms opens innovative possibilities for property design of glasses adapted to their respective application.

© Suad Kamardeen - Unsplash

Degrees in summer semsester 2021

Dr. Hongbo Zhou (AG Wilde) and
Herr Dr. Vladislav Kulitckii (AG Wilde)

finished their doctorate!  Congratulation!

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Best Poster Award


Unsere Promovendin Shabnahm Taheriniya hat im August 2021 auf der internationalen Mikroskopie-Konferenz (MC 2021) den Posterpreis mit dem Poster-Titel „Structural resolution of severely deformed dual-phase high entropy alloys using nano-beam diffraction patterns in transmission electron microscopy“ erhalten.
Wir gratulieren ihr herzlich!

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Dreieinhalb Jahre Ausbildung sind geschafft!

Wir gratulieren unserer ehemaligen Auszubildenden Frau Anja Schneider ganz herzlich zur bestandenen Abschlussprüfung im Feinwerkmechaniker-Handwerk.
 
Durch eine hervorragend abgelegte Prüfung hat Frau Schneider gezeigt, dass sie sich vielfältigen Herausforderungen stellen kann. Sie hat dabei gelernt, knifflige Aufgaben zu lösen, die viel Fingerspitzengefühl verlangen und hat gemeinsam mit jungen Wissenschaftlerinnen und Wissenschaftlern Geräte gebaut, die für die Grundlagenforschung benötigt werden.

Es freut es uns umso mehr, dass Frau Schneider sich auch nach Ihrer Abschlussprüfung weiter an der Universität Münster engagiert und dass wir mit ihr eine weitere qualifizierte Mitarbeiterin für die WWU ausbilden konnten.

Für den Start als Gesellin wünschen wir ihr alles Gute und weiterhin so viel Spaß in dem Beruf der Feinwerkmechanikerin, wie es während der Ausbildungszeit war.

Sollte jetzt auch dein Interesse geweckt sein und dich der Beruf interessieren, dann informiere Dich gerne auf unserer Website.

© IMP

Dissertationspreis der WWU für Dr. Sven Hilke als Anerkennung für exzellente Forschung in der Materialphysik

Die Westfälische Wilhelms-Universität Münster (WWU) hat Dr. Sven Hilke vom Institut für Materialphysik für seine herausragende Forschungsleistung im Rahmen seiner Dissertation in der AG von Prof. Gerhard Wilde mit dem diesjährigen Dissertationspreis ausgezeichnet. Herr Dr. Hilke hat sich im Rahmen seiner von der Deutschen Forschungsgemeinschaft geförderten Dissertation mit fundamentalen Fragestellungen zur Plastizität in metallischen Gläsern befasst. Hier wurden grundlegende Erkenntnisse zum Struktur-Eigenschaftsverhalten amorpher Materie mittels ausgeklügelter transmissionselektronenmikroskopischer Verfahren, die vom Summa-cum-laude-Absolventen größtenteils selbst neuentwickelt wurden, gewonnen. Diese Ergebnisse führten zu konkreten Lösungen aus denen sich praktische Anwendungsmöglichkeiten für diese neuartigen Legierungssysteme ergaben. Mit dieser Auszeichnung erfährt nun eine bemerkenswerte Arbeit ihre Würdigung. Wir gratulieren herzlichst und freuen uns mit dem Preisträger über diese Auszeichnung!

Publikationen von Dr. Sven Hilke
WWU zeichnet Autoren der 14 besten Dissertationen aus

© Elsevier B.V.

2019 Acta Student Awards

A team of judges consisting of Acta Materialia, Scripta Materialia, Acta Biomaterialia and Materialia editors evaluated the nominees for the annual Acta Student Awards.
For the experimental part of the collaborational work with Katrin Abrahams and Ingo Steinbach (Ruhr-University Bochum) published as
Concentration-dependent atomic mobilities in FCC CoCrFeMnNi high-entropy alloys (Daniel Gaertner, Katrin Abrahams, Josua Kottke, Vladimir A. Esin, Ingo Steinbach, Gerhard Wilde, Sergiy V. Divinski) in Acta Materialia 166 (2019) 357-370, Daniel Gaertner was selected as an awardee of the 2019 Acta Student Awards. Congratulation!

© Elsevier

Outstanding Reviewer 2019

Again: Prof. Gerhard Wilde and private lecturer Dr. Divinskiy were honoured as outstanding reviewers 2019 for the journal Acta Materialia.