Metastable phase selection from undercooled Zr 77 Rh 23 liquid alloys

• Published in: Journal of alloys and compounds Vol. 725; no. C
• Main Authors: Johnson, M. L., Gibbons, P. C., Vogt, A. J., Kelton, K. F.
• Format: Journal Article
• Language: English
• Published: United States Elsevier 01-11-2017
• Subjects: MATERIALS SCIENCE
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2017.07.241

From measurements of X-ray and neutron scattering of electrostatically levitated Zr77Rh23 liquids, a variety of metastable crystallization behavior was observed. The metastable phase selection in deeply undercooled liquid droplets is characterized and their crystallization pathways discussed. A metastable phase previously identified as a primary devitrification product from the metallic glass formed when undercooling was maximized to near the hypercooling limit. The direct formation of α–Zr and the equilibrium C16 phase as well as a newly discovered Zr5Rh3 (Mg5Si3-type) phase are also reported.