The Stability of Al^sub 11^Sm^sub 3^ (Al^sub 4^Sm) Phases in the Al-Sm Binary System

From: Metallurgical and Materials Transactions | Date: June 1, 2007| Author: | Copyright information

The relative stability of Al^sub 11^Sm^sub 3^ (Al^sub 4^Sm) 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, α and γ, have no range of full stability but are metastable with respect to the crystalline Al and Sm reference states down to 0 K. Thermodynamic modeling is used to describe the relative energetics of stable ...

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