Microstructures and phase transformations in interstitial alloys of tantalum
The analysis of microstructures, phases, and possible ordering of interstitial solute atoms is fundamental to an understanding of the properties of metal-interstitial alloys in general. As evidenced by the controversies on phase transformations in the particular system tantalum--carbon, our understanding of this class of alloys is inferior to our knowledge of substitutional metal alloys. An experimental clarification of these controversies in tantalum was made. Using advanced techniques of electron microscopy and ultrahigh vacuum techology, an understanding of the microstructures and phase transformations in dilute interstitial tantalum--carbon alloys is developed. Through a number of control experiments, the role and sources of interstitial contamination in the alloy preparation (and under operating conditions) are revealed. It is demonstrated that all previously published work on the dilute interstitially ordered phase Ta/sub 64/C can be explained consistently in terms of ordering of the interstitial contaminants oxygen and hydrogen, leading to the formation of the phases Ta/sub 12/O and Ta/sub 2/H.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6170360
- Report Number(s):
- LBL-8661
- Country of Publication:
- United States
- Language:
- English
Similar Records
Microstructurally-Inspired Strategies to Print Tantalum and Tantalum-Tungsten Alloys
Microstructurally-Inspired Strategies to Print Tantalum and Tantalum-Tungsten Alloys
Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALLOYS
CARBIDES
CARBON
CARBON COMPOUNDS
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
ELEMENTS
GRAIN ORIENTATION
HYDRIDES
HYDROGEN COMPOUNDS
INTERSTITIALS
MATHEMATICAL MODELS
MICROSTRUCTURE
NONMETALS
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POINT DEFECTS
PRECIPITATION
SEPARATION PROCESSES
TANTALUM ALLOYS
TANTALUM CARBIDES
TANTALUM COMPOUNDS
TANTALUM HYDRIDES
TANTALUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TWINNING