The stability of Al11SM3 (Al4SM) phases in the Al-Sm binary system

TitleThe stability of Al11SM3 (Al4SM) phases in the Al-Sm binary system
Publication TypeJournal Article
Year of Publication2007
AuthorsZhou SH, Napolitano RE
Journal TitleMetallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
Date PublishedJun
Type of ArticleArticle
ISBN Number1073-5623
Accession NumberISI:000248187200001
KeywordsALUMINIUM-SAMARIUM, amorphous-alloys, behavior, CRYSTALLIZATION, earth, elements, PSEUDOPOTENTIALS

The relative stability of Al11Sm3 (Al4Sm) intermetallic phases was experimentally investigated through a series of heat treatments followed by microstructural, microchemical, and X-ray diffraction (XRD) analyses. The principal findings are that the high-temperature tetragonal phase is stable from 1655 to 1333 K and that the low-temperature orthorhombic phases, a and, have no range of full stability but are metastable with respect to the crystalline Al and Sin reference states down to 0 K. Thermodynamic modeling is used to describe the relative energetics of stable and metastable phases along with the associated two-phase mixtures. Issues regarding transition energetics and kinetics are discussed.

Alternate JournalMetall. Mater. Trans. A-Phys. Metall. Mater. Sci.