Premium
Relationship between Fracture. Toughness and Phase Assemblage in Mg‐PSZ
Author(s) -
Hannink Richard H. J.,
Howard Christopher J.,
Kisi Erich H.,
Swain Michael V.
Publication year - 1994
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.1151-2916.1994.tb07031.x
Subject(s) - materials science , tetragonal crystal system , fracture toughness , phase (matter) , alloy , toughness , composite material , neutron diffraction , analytical chemistry (journal) , crystallography , crystal structure , chemistry , chromatography , organic chemistry
The phase content, size, and distribution have a marked effect on the thermomechanical properties of a 9 mol% MgO‐ZrO 2 (Mg‐PSZ) alloy. The work undertaken in this study is the first investigation to simultaneously measure and characterize the quantitative bulk phase contents and correlate these parameters to the fracture toughness and R ‐curve behavior of a variously aged Mg‐PSZ alloy. Quantitative bulk phase characterization entailed a systematic evaluation using neutron diffraction. In addition, microscopy techniques were used to determine the phase distribution and assemblage. The results indicate that the maximum toughness is attained, for a constant tetragonal precipitate size, when the anion‐ordered δ‐phase (Mg 2 Zr 5 O 12 ) replaces a major portion of the cubic matrix phase after and 1100°C aging treatment. The shape of the R ‐curve and the stress required to transform the tetragonal precipitates are also significantly influenced by the δ‐pnase content.