Alloy development in (Mg,Y) partially stabilized zirconia
The processing, microstructural characterization, phase transformations and preliminary mechanical properties of three different (Mg,Y)-PSZ alloys and one (Mg,Y)-TZP alloys have been studied. Chapter 2 discusses the chloride synthesis method for producing ternary (MgO,Y/sub 2/O/sub 3/)-ZrO/sub 2/ powder, with emphasis on the effect of agglomerate structure of powder on the sintering behavior. TEM, x-ray and BET were used to characterize gels, powders, and sintered specimens. Chapter 3 discusses the morphology of tetragonal precipitates in three (Mg,Y)-PSZ alloys with different ratios and amounts of MgO and Y/sub 2/O/sub 3/. An unusual tetrahedral morphology of tetragonal precipitates was found in an alloy with 2.6 mol% MgO and 4.5 mol% Y/sub 2/O/sub 3/. Chapter 4 discusses the martensitic transformation in a ternary (Mg,Y)-TZP based upon in-situ TEM observations. Chapter 5 discusses the martensitic transformation of t-ZrO/sub 2/ precipitates in ternary (Mg,Y)-PSZ by using TEM in situ observations. The transformation occurs autocatalytically and takes place by piece-wise growth of two twin-related m-ZrO/sub 2/ variants. Chapter 6 discusses the preliminary mechanical results of these new alloys.
- Research Organization:
- Case Western Reserve Univ., Cleveland, OH (USA)
- OSTI ID:
- 6292374
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101 -- Metals & Alloys-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
AGGLOMERATION
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALLURGY
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POWDER METALLURGY
PRECIPITATION
SEPARATION PROCESSES
STABILIZATION
TRANSITION ELEMENT COMPOUNDS
YTTRIUM ADDITIONS
YTTRIUM ALLOYS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES