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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 3/2019

01-01-2019 | Communication

Experimental Determination of the Allotropic Transition Temperature Between Tetragonal and Orthorhombic Al4Sm Metastable Phases

Authors: R. E. Napolitano, S. H. Zhou, X. Yang, F. Q. Meng

Published in: Metallurgical and Materials Transactions A | Issue 3/2019

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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.
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Footnotes
1
X-ray scans were performed with a PANalytical X'Pert PRO diffractometer using Co-Kα (λ = 0.178901 nm, 45 kV) and Bruker D8 Advance X-ray diffractometer using Cu-Kα (λ = 0.15418 nm, 40 kV).
 
2
Rietveld fit analysis yielded γ-phase lattice parameters of a=4.49684, b=6.44505, c=13.87935 nm. For comparison, Pearson table parameters are a = 4.44, b = 6.38, c = 13.62 nm.
 
3
Synchrotron X-ray scattering was performed at the 11-ID-C beam line at the Advanced Photo Source, Argonne National Laboratory, USA.
 
4
2D diffraction patterns were collected with a Perkin-Elmer XXXX detector, with 0.2 × 0.2 mm pixel size.
 
5
Pattern integration was performed with Fit2D software.
 
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Metadata
Title
Experimental Determination of the Allotropic Transition Temperature Between Tetragonal and Orthorhombic Al4Sm Metastable Phases
Authors
R. E. Napolitano
S. H. Zhou
X. Yang
F. Q. Meng
Publication date
01-01-2019
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 3/2019
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-018-5064-7

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