Regensburg 2025 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 23: Phase Transformations
MM 23.4: Talk
Wednesday, March 19, 2025, 18:00–18:15, H23
Temperature-modulated dilatometry as a tool for studying precipitation kinetics in alloys — •Marcel Simhofer1, Philipp Brunner1, Jiehua Li2, Wolfgang Sprengel1, and Roland Würschum1 — 1Inst. of Mater. Phys., NAWI Graz, Graz Univ. of Technol., Graz 8010, Austria — 2Inst. of Casting Res., Montanuniv. Leoben, Leoben 8700, Austria
Temperature-modulated dilatometry is implemented as a tool for studying phase equilibration processes in alloys. As a case example, the phase equilibration between the saturated solid solution Al(Mg) and intermetallic Al3Mg2 in the Al(Mg) binary alloy is studied. The varying solubility of Mg in Al upon temperature modulation causes a modulation of the relative fractions of the two phases, which can be in-situ monitored by dilatometry owing to their different atomic volumes. The phase shift between the length change caused by phase equilibration and the applied sinusoidal temperature variation yields access to equilibration kinetics. The observed variation of the phase shift with the modulation frequency is quantitatively analyzed in the framework of a simple kinetic model, revealing that the equilibration process is controlled by the diffusion of Mg in Al.
M. Simhofer et al., J.Alloys&Comp. 1010 (2025) 176984
Keywords: Dilatometry; Precipitation; Al-Mg-alloy; Thermal analysis; Temperature modulation