Projects per year
A high-stability non-contact dilatometer based on two-beam Michelson interferometry was developed recently, enabling isothermal measurements of relative length changes in the sub-10-5 regime with minimized drift over times as long as 106 s. This advanced technique opens up novel potentials for quantitative studies of precipitation phenomena, which are associated with tiny relative length changes that have not been accessible before. Using a dilute Al-Mg-Si alloy as a case study, the amount of the metastable coherent beta''- and of the semi-coherent beta'-phase, as well as the amount of the stable beta-phase could be determined quantitatively from isothermal length change measurements. This is accomplished by the distinct length change features that arise from the volume excess due to the precipitates, on the one hand, and the contraction of the matrix upon precipitation of solu te atoms, on the other hand. Moreover, reaction-rate analyses of isothermal length change variations yield the kinetic parameters for the formation and transformation of the precipitates.
|Title of host publication||40th Risø International Symposium on Material Science|
|Subtitle of host publication||IOP Conf. Series: Materials Science and Engineering|
|Publication status||Published - 2019|
|Name||IOP Conference Series / Materials Science and Engineering|
|Publisher||Institute of Physics, London|
Fields of Expertise
- Advanced Materials Science
FingerprintDive into the research topics of 'Recent progress in dilatometry for quantitative analysis of precipitation kinetics'. Together they form a unique fingerprint.
- 1 Active
Defects & Transformations of Materials
Klinser, G., Sprengel, W. & Würschum, R.
1/01/13 → …
Project: Research area
- 1 Talk at conference or symposium
Recent progress in dilatometry for quantitative analysis of precipitation kinetics
Roland Würschum (Speaker)5 Sep 2019
Activity: Talk or presentation › Talk at conference or symposium › Science to science