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SUMMARY:High-Temperature Superalloys: Uncovering New Mechanisms for Enhanc
 ed Performance - Dr Steffen Neumeier\, FAU Erlangen-Nürnberg
DTSTART:20250619T100000Z
DTEND:20250619T110000Z
UID:TALK233512@talks.cam.ac.uk
CONTACT:Caroline Teagle
DESCRIPTION:Refreshments and cakes will be available!\n\nMetallic high-tem
 perature materials\, particularly superalloys\, are crucial to modern tech
 nology\; without them\, essential applications such as rockets for launchi
 ng satellites\, jet engines for global mobility\, and stationary gas turbi
 nes for electricity generation would be unfeasible. Superalloys have been 
 developed over several decades and have undergone continuous improvement t
 o operate at increasingly high temperatures\, aiming to enhance efficiency
  and reduce CO2 emissions.\nExtensive research has been carried out on sup
 eralloys since the mid-20th century\, leading to the assumption that the f
 undamental mechanisms that govern their performance are fully understood. 
 This presentation will address several key questions that challenge this n
 otion:\n1. Are there mechanisms for strengthening alloys at high temperatu
 res beyond the classical approaches\, such as solid solution hardening and
  precipitation strengthening?\n2. Are slowly diffusing elements always the
  most effective for enhancing creep strength?\n3. Do Kear-Wilsdorf locks i
 nvariably account for yield strength anomalies?\n4. Is embrittlement at in
 termediate temperatures solely attributed to environmental factors like ox
 idation at grain boundaries?\nThe findings presented will demonstrate that
  the answers to these fundamental questions are\, in fact\, “no.” New 
 insights indicate that diffusion-controlled segregation of alloying elemen
 ts plays a pivotal role in high-temperature deformation. Understanding the
 se phenomena is essential for the design of future alloys that possess eve
 n better properties for high-temperature applications.\n\nBio:\nPD Dr.-Ing
 . Steffen Neumeier is a senior scientist and group leader at the Departmen
 t of Materials Science and Engineering of the Friedrich-Alexander-Universi
 ty Erlangen-Nürnberg (FAU)\, Germany. He studied Materials Science and En
 gineering at the FAU\, where he received his Diploma (Dipl.-Ing.) in 2006.
  Afterwards he did his PhD from 2006 to 2009 on 4th generation Ni-base sup
 eralloys in the group of Prof. M. Göken at the FAU\, from where he obtain
 ed his doctorate degree with distinction in 2010. During his postdoc perio
 d from 2009 to 2010 in the group of Prof. C. Rae and Prof. H. Stone at the
  Rolls-Royce-University Technology Center of the University of Cambridge\,
  UK\, he worked on the identification and development of novel alloys for 
 high temperature structural applications. Since 2011\, he leads the “Hig
 h temperature materials group” at the Institute MSE I\, General Material
 s Properties\, and is a lecturer at the FAU. In 2024\, he completed his ha
 bilitation at the FAU\, earning the title of "Privatdozent (PD)".\nDr. Neu
 meier’s primary research focus is on the correlation between composition
 \, processing\, microstructure and mechanical properties of high temperatu
 re materials\, such as Ni-\, Co- and Fe-based superalloys\, intermetallics
 \, titanium aluminides\, in-situ eutectic composites\, refractory and plat
 inum group metal alloys\, complex concentrated alloys and coatings. His fu
 rther scientific interests are the impact of hydrogen on structural materi
 als and their characterization by X-ray and neutron scattering and diffrac
 tion techniques.\nDr. Steffen Neumeier received the Young scientist award 
 in 2010 and the Masing Memorial Award in 2016 of the German Society for Ma
 terials Science (DGM). He (co-)authored more than 150 peer-reviewed journa
 l and proceeding articles in the field of materials science. He has an h-i
 ndex of 38 and was among the top two percent of the most cited scientists 
 worldwide in 2021.
LOCATION:Goldsmiths' 2 & https://zoom.us/j/96836714124
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