Premium
Phase Transformations in Dicalcium Silicate: I, Fabrication and Phase Stability of Fine‐Grained β Phase
Author(s) -
Nettleship Ian,
Slavick Kurt G.,
Kim Youn Joong,
Kriven Waltraud M.
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb05592.x
Subject(s) - materials science , tetragonal crystal system , fabrication , microstructure , phase (matter) , coalescence (physics) , composite material , elastic modulus , grain size , stress (linguistics) , mineralogy , cubic zirconia , ceramic , geology , chemistry , medicine , linguistics , alternative medicine , physics , philosophy , organic chemistry , pathology , astrobiology
Fine‐grained β‐Ca 2 SiO 4 containing small amounts of sodium was fabricated as an analogue to tetragonal zirconia polycrystals (TZP) in order to study the stress‐induced β→γ transformation. This avoided the problems associated with the fabrication and evaluation of composites containing β‐Ca 2 SiO 4 . The microstructure of dense β‐Ca 2 SiO 4 exhibited severe intergranular strains and twin‐terminating microcracks as seen by TEM. The β‐phase twin widths were quantitatively correlated with grain sizes giving an average ratio of 0.04. Stress‐induced transformation was observed on ground surfaces but not on fracture surfaces. The stress–strain behavior and the mechanical properties were consistent with stress‐induced microcracking and microcrack coalescence. The elastic modulus of fully dense β phase was estimated to be 123 GPa.