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Nanostructured Materials Lab

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Collapse of lamellar structure and stability with the addition of Misc…

ABSTRACT
Misch metal (Mm), consisting of Ce and La, was added to Ti–45Al–3Mo–2Nb
alloys in order to investigate phase transformation and microstructural changes.
The pseudo-binary phase diagram was estimated via PANDAT softwareTM. The
addition of Mm caused a decrease in both the fractions of a2/c lamella and the
b0 phase, and served as an important factor for a collapse of lamellar structures.
In addition, Mm significantly decreased the colony size of the alloy, resulting in
an increase in high-temperature tensile yield strength of * 40% for the alloys
with 0.3 at% Mm at 800 C. It appears that the addition of Mm affects the phase
stability and increase the proportion of the c phase. The microstructural changes,
with respect to Mm additions, were discussed in terms of structural
observations during isothermal heat treatments.