REACTOR MATERIALS STUDY. RESEARCH AND DEVELOPMENT OF METAL HYDRIDES. Quarterly Report No. 3, April 1, 1959 to June 30, 1959

Technical Report · Wed Jul 15 04:00:00 EDT 1959

OSTI ID:4800175

Beck, R L

As an aid in interpreting the physical and mechanical properties data obtained for zirconium hydride, an investigation of the Zr-H phase diagram was undertaken. This study showed that the first hydride phase formed has a body centered orthorhombic structure and contains 62 at.% hydrogen. At higher compositions it appears that the true equllibrium structure is not obtained in normal practice because of the existence of a martensitic transition phase. A study of the thermal expansion properties of zirconium hydride indicated that hydrides containing less than about 55 at.% hydrogen would be unsuitable for use above the eutectoid temperature (540 deg C), but that higher compositions should be quite acceptable. Thermal conductivity data are also presented which recommend the use of hydrides containing more than about 55 at.% hydrogen. However, mechanical tests showed that zirconium hydride loses essentially all ductility at compositions above about 55 at.% even at temperatures as high as 700 deg C. The hydriding characteristics of potential shield materials based on gadolinium, titanium-gadolinium, and titanium-vanadium-gadolinium are presented. Preliminary tenslle data are given for gadolinium hydride and a titanium-40 wt.% gadolinium hydride. Complete PTC data are presented for the hydrides of erbium and dysprosium up to compositions exceeding the dihydride. Density and hardness curves are also shown for these hydrides. (auth)

• Research Organization: Denver. Univ. Denver Research Inst.
• NSA Number: NSA-16-012099
• OSTI ID: 4800175
• Report Number(s): LAR-3
• Country of Publication: United States
• Language: English

Related Subjects

CONFIGURATION
DENSITY
DIAGRAMS
DUCTILITY
DYSPROSIUM
DYSPROSIUM HYDRIDES
ERBIUM
ERBIUM HYDRIDES
EUTECTICS
EUTECTOIDS
EXPANSION
GADOLINIUM
GADOLINIUM ALLOYS
GADOLINIUM HYDRIDES
HARDNESS
HIGH TEMPERATURE
HYDRIDES
HYDROGEN
INTERMETALLIC COMPOUNDS
LATTICES
MARTENSITE
MATERIALS TESTING
MECHANICAL PROPERTIES
METALS, CERAMICS, AND OTHER MATERIALS
PHASE DIAGRAMS
REACTOR MATERIALS
SHIELDING
SHIELDING MATERIALS
STABILITY
STANDARDS
TEMPERATURE
TENSILE PROPERTIES
THERMAL CONDUCTIVITY
TITANIUM ALLOYS
TITANIUM HYDRIDES
VANADIUM ALLOYS
VANADIUM HYDRIDES
ZIRCONIUM HYDRIDES