Experimental Determination of the Allotropic Transition Temperature Between Tetragonal and Orthorhombic Al4Sm Metastable Phases
Abstract
The allotropic transition temperature associated with the metastable γ-Al4Sm (orthorhombic) and β-Al4Sm (tetragonal) phases was investigated experimentally. Low-energy X-ray diffraction and differential scanning calorimetry were found to be inconclusive due to the transient nature of the phases involved, which spontaneously decompose to the stable δ-Al3Sm and Al-fcc phases. High-energy X-ray diffraction, using synchrotron radiation, however, was able to resolve the transition during continuous heating, enabling detailed analysis of the temperature-dependent diffraction pattern. The γ- β transition temperature was determined to be 896 K, based on a well-resolved transition onset.
- Publication:
-
Metallurgical and Materials Transactions A
- Pub Date:
- March 2019
- DOI:
- 10.1007/s11661-018-5064-7
- Bibcode:
- 2019MMTA...50.1130N