| Autor: |
Dahms, Michael, Jewett, Thomas J., Michaelsen, Carsten |
| Zdroj: |
International Journal of Materials Research: Zeitschrift fuer Metallkunde; November 2021, Vol. 88 Issue: 2 p125-130, 6p |
| Abstrakt: |
An elemental powder composite Ti-48 at.% Al was prepared by cold extrusion. The kinetics of annealing-induced phase formation at 800 °C was studied using quantitative X-ray diffraction, and the results were analyzed in terms of a one-dimensional multiphase diffusion model. During heating to 800 °C, a reaction takes place which results in a multiphase mixture containing Ti3Al, TiAl, Al2Ti and Al3Ti. Subsequent annealing at 800 °C leads to the growth of the phases TiAl and Al2Ti at the expense of Ti3Al and Al3Ti. In the competitive growth stage, the diffusion through Al2Ti is 1.4 times quicker than through TiAl. After consumption of Al3Ti, the growth of TiAl at the expense of Al2Ti and Ti3Al can be described by a classical t-law where tis the annealing time. Due to the statistical nature of the original microstructure, the final stages of TiAl growth are slowed down according to Johnson-Mehl-Avrami growth kinetics with exponent n= 0.61. |
| Databáze: |
Supplemental Index |
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