INTERMEDIATE-TEMPERATURE OXIDATION OF BERYLLIDES. Monthly Letter Report No. 8, April 1, 1962 to May 1, 1962

Technical Report · Tue May 01 04:00:00 EDT 1962

OSTI ID:4791295

Perkins, F C

Activities in a program to study oxidation kinetics and characteristics of ZrBe/sub 13/, Zr/sub 2/B/sub 17/, NbBe/sub 12/, and Nb/sub 2/ Be/sub 17/ at 1200 to 1800 deg F are reported. Data from gravimetric experiments performed on nominal ZrBe/sub 13/ and Zr/sub 2/Be/sub 17/ materials are tabulated. Oxidation curves are included. Effort was also devoted toward investigation of an observed metallographic manifestation which might help explain disintegration phenomena related to beryllide materials. A very fine grain boundary precipitate was detected in nominal ZrBe/sub 13/ and Nb/sub 2/Be/sub 17/ materials after prolonged heat treatment in the intermediate sensitive temperature range. The location of a precipitate found at the junction of the ZrBe/sub 13/ and Zr/sub 2/ Be/sub 17/ phases suggests that one of these phases may have a higher solubility for a suspected impurity (probably O) than the other phase. Preliminary metallographic study of nominal Zr/sub 2/Be/sub 17/ material which was annealed in the sensitive temperature range revealed no major internal precipitation. This was interpreted to indicate that the Zr/sub 2/Be/sub 17/. Phase has greater solubility for the impurity. Stoichiometry ntay therefore have some influence on the mechanism of disintegration in view of the partitioning of the impurity between the two phases. (J.R.D.)

• Research Organization: Denver. Univ. Denver Research Inst.
• NSA Number: NSA-16-027562
• OSTI ID: 4791295
• Report Number(s): TID-16019
• Country of Publication: United States
• Language: English

Related Subjects

BERYLLIUM ALLOYS
GRAIN BOUNDARIES
HEAT TREATMENTS
HIGH TEMPERATURE
IMPURITIES
INTERMETALLIC COMPOUNDS
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM ALLOYS
OXIDATION
PHASE DIAGRAMS
PRECIPITATION
REACTION KINETICS
SOLUBILITY
ZIRCONIUM ALLOYS
ZIRCONIUM BORIDES