Ch. Park et al., THERMAL-STABILITY AND BRAZING CHARACTERISTICS OF ZR-BE BINARY AMORPHOUS FILLER METALS FOR ZIRCONIUM ALLOY, Journal of nuclear materials, 254(1), 1998, pp. 34-41
Citations number
20
Categorie Soggetti
Nuclear Sciences & Tecnology","Mining & Mineral Processing","Material Science
The thermal stability and brazing characteristics of Zi-Br binary amor
phous alloys as a new filler metal for joining zirconium alloy were in
vestigated in order to supersede physically vapor-deposited (PVD) bery
llium used conventionally with many disadvantages. The Zr1-xBex (0.3 l
ess than or equal to x less than or equal to 0.5) binary amorphous all
oys were produced by melt-spinning method. In the selected composition
range the Zr-Be amorphous alloys have two crystallization modes which
are dependent on beryllium content in alloys. The temperatures and ac
tivation energies for crystallization depend on crystallization-mode a
s well as beryllium content. These amorphous alloys were put into prac
tical use in joining bearing pads on zircaloy cladding sheath. Using Z
r-Be amorphous alloys as filler metals, the reduction in thickness of
cladding sheath wall are prevented. Especially, in the case of using Z
r0.65Be0.35 and Zr0.7Be0.3 amorphous alloys, smooth interface and sphe
rical primary alpha-Zr particles appear in the brazed layer, which is
desirable microstructure in the view of the corrosion-resistance. (C)
199S Elsevier Science B.V.