D. Kiener

Assoc. Prof. Dr.
Daniel
Kiener
Function: 
Group Leader
Room: 
412
Phone: 
+43(0)3842-804-412
E-Mail: 
daniel.kiener@unileoben.ac.at
Themes: 

When the material grain size or the sample volume itself are reduced to the micron- and sub-micron regime, significant size effects on the mechanical properties arise due to the increased contribution of surfaces and interfaces. We aim to derive a mechanistic understanding of the interplay between sample or microstructure size, the presence of individual microstructural elements such as interfaces, grain boundaries or dislocations, and the resulting global material properties. This is achieved by a combination of sophisticated methods such as highly localized and miniaturized quantitative experiments performed within high-resolution electron microscopy techniques, temperature- and rate dependent thermo-mechanical microstructure analysis, and advanced nanoindentation techniques. Various interests in the field of Micro- and Nanomechanics concern:

  • Miniaturized testing techniques (compression, tension, bending, fracture, fatigue, ...)
  • Small scale sample preparation techniques
  • Quantitative electron microscopy
  • Size effects influencing material properties
  • Dislocation plasticity in confined volumes
  • Deformation mechanisms in nanoscale or nanostructured materials (slip, twinning, grain boundaries)
  • Irradiation resistant materials by microstructural design
  • Temperature dependent deformation mechanisms of single crystal and nanocrystalline fcc and bcc metals
  • Thermal fatigue behavior and microstructural stability of metallic thin films
  • Local depth-dependen residual stresses in complex layered strucutres
  • Fracture processes and properties of small structures and multilayers
  • Deformation mechanisms in hexagonal metals
  • Temperature dependent deformation mechanisms in nanoporous materials
Methods: 

Development of various techniques suited to produce and mechanically tests small scale structures, derive the mechanical properties, and correlate them to certain deformation mechanisms or crystal defects:

  • In situ micromechanical experiments in the SEM
  • In situ nanomechanical testing in the TEM
  • Broad ion beam and FIB based material structuring
  • Advanced nanoindentation techniques (e.g. elevated temperatures, rate dependencies)
  • Digital image correlation techniques to measure local deformations and microstructural evolution
  • Local determination of residual stresses with high depth resolution
  • Miniaturized fracture testing in the SEM and TEM
  • Novel laser-based fast thermo-mechanical heating/cycling techniques

Teaching:

Member of the curriculum comission for Materials Science and involved in several lectures in the Bachelor and Master program for Masterials Science at the Montanuniversität Leoben:

  • Introduction to Materials Science
  • Materials Characterization
  • Materials Physics I
  • Materials Physics III
  • Exercises to Materials Physics
  • Seminar Bachelor Thesis
  • Seminar Master Thesis
Personal files: 
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CV D. Kiener236.39 KB

Publications