ON THE $beta$-TO-$alpha$ TRANSFORMATION AND GRAIN-REFINEMENT OF U AND ITS DILUTE ALLOYS

Journal Article · Sun Sep 01 04:00:00 EDT 1963 · Nippon Genshiryoku Gakkaishi (Japan)

OSTI ID:4687644

Soeno, Ko

The kinetic behavior of the BETA -to- alpha transformation in uranium binary alloys containing less than 1 at.% of Cr, Fe, Mn, Mo, Si, V, Ti, or Zr were studied. The results lead to the conclusion that nucleation-and-growth and martensitic mechanisms are confirmed in such alloys containing Cr, Fe, Mn, Mo, Si, or V whose BETA -uranium decomposes to alpha -uranium in eutectoid reaction. M/sub s/ temperatures are summarized in the six alloys. Grain diameters after isothermal transformation were examined in each alloy. It was concluded that the temperature region suitable for grain-refinement is below the nose of TTT diagram in nucleation-and-growth mechanism down to M/sub s/ temperature. Grain diameter from 50 to 30 mu were obtainable in such temperature region. The results suggest that similar manner is applicable for grain-refinement in any other alloy whose BETA -uranium decomposes to alpha uranium by eutectoid reaction, as it was concluded that one of the necessary conditions for grain-refinement is the existence of nucleation-and-growth type transformation. The alpha in equilibrium BETA transformation of pure uranium wss concluded to be martensitic on the basis of the studies on dilute uranium alloys. The existence of martensitic mechanism is also suggested in gamma -to- BETA transformation of uranium and its dilute alloys. (auth)

• Research Organization: Hitachi Ltd., Japan
• NSA Number: NSA-17-041468
• OSTI ID: 4687644
• Journal Information: Nippon Genshiryoku Gakkaishi (Japan), Journal Name: Nippon Genshiryoku Gakkaishi (Japan) Vol. Vol: 5; ISSN NGEGA
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

ALLOTROPY
CHROMIUM ALLOYS
CRYSTALLIZATION
EUTECTICS
EXPANSION
GRAIN SIZE
IRON ALLOYS
MANGANESE ALLOYS
MARTENSITE
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NUCLEATE BOILING
PHASE DIAGRAMS
TITANIUM ALLOYS
URANIUM
URANIUM ALLOYS
URANIUM SILICIDES
URANIUM-ALPHA
URANIUM-BETA
URANIUM-GAMMA
VANADIUM ALLOYS
ZIRCONIUM ALLOYS