Experimental Determination of the Allotropic Transition Temperature Between Tetragonal and Orthorhombic Al4Sm Metastable Phases
The allotropic transition temperature associated with the metastable γ -Al 4 Sm (orthorhombic) and β -Al 4 Sm (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 phase...
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Veröffentlicht in: | Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2019-03, Vol.50 (3), p.1130-1136 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The allotropic transition temperature associated with the metastable
γ
-Al
4
Sm (orthorhombic) and
β
-Al
4
Sm (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
-Al
3
Sm 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. |
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ISSN: | 1073-5623 1543-1940 |
DOI: | 10.1007/s11661-018-5064-7 |