Nichteisenmetallurgie, Nichteisen, Nichteisenmetalurgie, Metalurgie, Montan, Montanuni, Montanuniversität, Leoben, Metallurgie, Helmut Antrekowitsch, Stefan Pogatscher, Jürgen Antrekowitsch, Stefan Luidold, Stefan Steinlechner, Recyclingtechnik Leoben
Dipl.-Ing. Dr.mont.

Phillip Dumitraschkewitz

Focus

• Imaging of cluster formation in aluminium alloys
• Implementation of clusterfinding algorithms
• High resolution characterization with atom probe tomography (APT) and transmission electron microscopy (S/TEM)
• Calometric characterization, DSC and Flash DSC
• Computer aided data evaluation

Contact

Education

2000–2004BRG Bruck/Mur
2004–2009HTL Leoben, Focus on metallurgy, Passed with honors
2009–2014Bachelor’s degree program in Material Science, University of Leoben, Austria (B.Sc.)
2014–2015Master’s degree program in Material Science, University of Leoben, Austria, Graduation
Topic: Planar faults in gamma – TiAl: An atomistic study
2019Conferral of doctorate (Dr. mont.)
Topic: Clustering and Diffusion in Aluminium Alloys

Professional experience

2015–presentPhD student and research associate at Institute of Nonferrous Metallurgy, University of Leoben, Austria

PhD Thesis

Title: Clustering and diffusion in aluminium alloys

This thesis gives an overview of existing information on natural aging and clustering in aluminum alloys. An in-depth understanding of existing analysis methods of clustering is established. Moreover, an approach is developed, and applied, to access natural aging times below one hour via atom probe tomography. With the realized experiments it is shown that the as-quenched state can be investigated. Moreover it is demonstrated that clustering and all non-equilibrium vacancy controlled diffusionional processes are size-dependent and natural aging is effectively stopped when the material dimensions reach the nanometer scale.

Publications

Stemper L., M. A. Tunes, P. Dumitraschkewitz, F. Mendez-Martin, R. Tosone, D. Marchand, W. A. Curtin, P. J. Uggowitzer and S. Pogatscher: Giant hardening response in AlMgZn (Cu) alloys. Acta Materialia, Band 206 (2021)

Kremmer T.M., P. Dumitraschkewitz, D. Pöschmann, T. Ebner, P.J. Uggowitzer, G.K.H. Kolb and S. Pogatscher: Microstructural Change during the Interrupted Quenching of the AlZnMg(Cu) Alloy AA7050. Materials, 2020, 13, 2554, 1-11

Holec D., P. Dumitraschkewitz, D. Vollath and Franz D. Fischer: Surface Energy of Au Nanoparticles Depending on Their Size and Shape. nanomaterials, 2020, 10, 484, 1-14

Tunes M. A., C. Quick, L. Stemper, D. S. R. Coradini, J. Grasserbauer, P. Dumitraschkewitz, T. M. Kremmer and S. Pogatscher: A contaminationfree electron-transparent metallic sample preparation method for MEMS experiments with in situ S/TEM. arXiv:2012.029 (2020)

Dumitraschkewitz P., P. J. Uggowitzer, S. S. A. Gerstl, J. F. Löffler und S. Pogatscher: Size-dependent diffusion controls natural aging in aluminium alloys. Nature Communications, 2019, 10, 1-6

Dumitraschkewitz P., S. S. A. Gerstl, L. T. Stephenson, P. J. Uggowitzer and S. Pogatscher: Clustering in Age-Hardenable Aluminum Alloys. Adv. Eng. Mater., 2012, 2018, 1800255

Spierings A. B., K. Dawson, P. Dumitraschkewitz, S. Pogatscher and K. Wegener: Microstructure characterization of SLM-processed Al-Mg-Sc-Zr alloy in the heat treated and HIPed condition. Additive Manufacturing, 20, 2018, 173–181

Dumitraschkewitz P., H. Clemens, S. Mayer and D. Holec: Impact of alloying on stacking fault energies in ϒ-TiAl. Applied Sciences. 2017, 7, 1193

Dumitraschkewitz P., S. S. A. Gerstl, P. J. Uggowitzer, J. F. Löffler and S. Pogatscher: Atom Probe Tomography Study of As-Quenched Al–Mg–Si Alloys. Advanced Engineering Materials, 2016

Presentations

Pogatscher S., G. K.-H Kolb., H. Antrekowitsch, T. Kremmer, P. Dumitraschkewitz , D. Pöschmann and P. J. Uggowitzer: Influence of Interrupted Quenching on Microstructure and Properties of 7xxx Aluminium Alloys. LightMAT, Bremen, Deutschland, 2017

Dumitraschkewitz P., G. Rank, S. C. Sackl, S. S. A. Gerstl and S. Pogatscher: Solute Distribution Analysis of Early Stages of Aging in Al-Mg-Si Alloys via Atom Probe Tomography. TMS 2017, San Diego

Dumitraschkewitz P., G. Rank, P. Uggowitzer, S.S.A. Gerstl and S. Pogatscher: Atom probe tomography of early natural aging and pre-aging of AA 6016. LightMAT, 2017, Bremen

Dumitraschkewitz P.: Atomsondentomographie und Clusterbildung in Aluminium Legierungen. Doktorandenseminar zur „Werkstofftechnik von Al“ 2016, Österreich, 2016

Dumitraschkewitz P.: Strategies for analyzing atom probe tomography data of an as-quenched and naturally aged Al-Mg-Si alloy. MetPhys ETH Zürich, Schweiz, 2016

Dumitraschkewitz P.: Rapid Clusters. Sitzung des wissenschaftlich-technologischen Beirats 2016 (AMAG), Österreich, 2016

Pogatscher S., P. Dumitraschkewitz and S.S.A Gerstl: Atom probe tomography of early stage clustering in Al alloys. EMC2016, Lyon, Frankreich, 2016

Pogatscher S., P. Dumitraschkewitz and S.S.A Gerstl: Atom probe tomography investigation of early stage clustering of as-quenched Al-Mg-Si alloys. ICAA15, Chongqing

Holec D., P. Dumitraschkewitz, F. D. Fischer und D. Vollath: Size-dependent surface energies of Au nanoparticles. 62. Arlberg Kolloquium, Österreich, 2015, 1–13

Posters

Dumitraschkewitz P.: Rapid Clusters. WerWasWo.Forschung@MUL, Leoben, Österreich, 2017

Dumitraschkewitz P., S. Pogtascher und S. Gerstl: Analysis of initial clustering in Al-Mg-Si alloys via atom probe tomography. Materials Science and Engineering 2016 (MSE), Deutschland

Dumitraschkewitz P., H. Clemens, S. Mayer und D. Holec: Ab initio study on stacking faults in gamma-TiAl. Intermetallics 2015, Deutschland, 2015