The α-to-α'
H phase transition in belite leads to the formation of the α'
H-phase lamellae within the parent a phase. The lamellae occur in parallel with ‹210›
α and make an angle of 27°with (0001)
α. This orientation is consistent with the completely coherent interphase boundaries between the a and α'
H phases. The transition is a nucleation and growth process, of which start and finish are shown on Time-Temperature-Transformation diagram. As a function of cooling rate, the phase constitution and microtexture at ambient temperatures can be predicted from the diagram. After the transition the remelting reaction occurs within the inverted α'
H-phase grains, the liquid phase nucleates and grows heterogeneously on the lamella boundaries leading to a decrease in impurity concentration in the host α'
H phase. A variety of microtextures results depending on the interfacial tension between the exsolved liquid and belite host as well as on quenching temperature and cooling rate.
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