Pressure induced phase transitions in ceramic compounds containing tetragonal zirconia
Stabilized tetragonal zirconia compounds exhibit a transformation toughening process in which stress applied to the material induces a crystallographic phase transition. The phase transition is accompanied by a volume expansion in the stressed region thereby dissipating stress and increasing the fracture strength of the material. The hydrostatic component of the stress required to induce the phase transition can be investigated by the use of a high pressure technique in combination with Micro-Raman spectroscopy. The intensity of Raman lines characteristic for the crystallographic phases can be used to calculate the amount of material that has undergone the transition as a function of pressure. It was found that pressures on the order of 2-5 kBar were sufficient to produce an almost complete transition from the original tetragonal to the less dense monoclinic phase; while a further increase in pressure caused a gradual reversal of the transition back to the original tetragonal structure.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); North Carolina State Univ., Raleigh, NC (United States)
- OSTI ID:
- 476630
- Report Number(s):
- LA-SUB-93-81; ON: DE97003578; TRN: 97:002288-0006
- Resource Relation:
- Other Information: PBD: Dec 1988; Related Information: Is Part Of Precision Engineering Center. 1988 Annual report, Volume VI; Dow, T. [ed.]; Fornaro, R.; Keltie, R.; Paesler, M. [and others]; PB: 367 p.
- Country of Publication:
- United States
- Language:
- English
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