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Metastability in the MgAl 2 O 4 –Al 2 O 3 System
Author(s) -
Wilkerson Kelley R.,
Smith Jeffrey D.,
Hemrick James G.
Publication year - 2014
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12294
Subject(s) - solvus , spinel , metastability , materials science , oxide , solid solution , aluminium , crystallography , line (geometry) , mineralogy , metallurgy , microstructure , chemistry , superalloy , organic chemistry , geometry , mathematics
Aluminum oxide must take a spinel form (γ‐Al 2 O 3 ) at increased temperatures in order for extensive solid solution to form between MgAl 2 O 4 and α‐Al 2 O 3 . The solvus line between MgAl 2 O 4 and Al 2 O 3 has been defined at 79.6 wt% Al 2 O 3 at 1500°C, 83.0 wt% Al 2 O 3 at 1600°C, and 86.5 wt% Al 2 O 3 at 1700°C. A metastable region has been defined at temperatures up to 1700°C which could have significant implications for material processing and properties. Additionally, initial processing could have major implications on final chemistry.