The effect of ternary addition on structure
and stability of NbCr2 Laves
phasesT. Takasugi
(*Tohoku University,
The alloying
effect on microstructure and stability of the
NbCr2 Laves phases is investigated using XRD and
TEM. In as-cast condition, the binary alloy as well as the ternary alloy
containing V consisted of the C15 phase while the ternary alloys
containing Mo, Ti and W consisted of both the C14 (or C36) and the C15
phases, accompanied with a number of stacking faults and microtwins in
their constituent phases. By a prolonged heat-treatment at 1673 K, the
retained C14 (or C36) phase is completely transformed to the C15 phase.
However, their kinetics are slower in the sequence of the ternary
alloys containing Mo > Ti > W. The alloying effect on the stability
of the C15 (or the C14) phase and the associated transformation process is
discussed on the basis of phase stability and kinetics.
Order No.:
JA809-023 © 1998 MRS
Go to September 1998 Table of Contents
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