THE LATTICE STABILITY OF METALS. I. TITANIUM AND ZIRCONIUM. Technical Report No. 1

Technical Report · Wed Oct 01 04:00:00 EDT 1958

OSTI ID:4274149

Kaufman, L

The difference in free energy between the bcc and hcp modifications of titanium and zirconium have been calculated between 0 and 2000 K by using existing thermodynamic data. These results have been employed to investigate the energetics of the bcc in equilibrium hcp reactions in the Ti-Zr system and in a series of titanium-base alloy systems. It is found that the chemical driving force for martensitic bcc - hcp reactions in these systems is about 50 cal/mol. This value, compared to 300 cal/mol for iron-base alloys, can be explained by the difference in physical characteristics of martensitic transformations in iron- base and in titanium-base alloys. A method is suggested for estimating M/sub s/ vs. composition curves for titanium and zirconium-base systems where such data are presently unavailable. (auth)

• Research Organization: Manufacturing Labs., Inc., Cambridge, Mass.
• NSA Number: NSA-13-002988
• OSTI ID: 4274149
• Report Number(s): NP-7025
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMICAL REACTIONS
DIAGRAMS
FREE ENERGY
HIGH TEMPERATURE
IRON ALLOYS
LATTICES
LOW TEMPERATURE
MARTENSITE
METALLURGY AND CERAMICS
NUMERICALS
PHASE DIAGRAMS
REACTION KINETICS
STABILITY
STANDARDS
TEMPERATURE
THERMODYNAMICS
TITANIUM
TITANIUM ALLOYS
ZIRCONIUM
ZIRCONIUM ALLOYS