The activity of MgO in MgO-B2O<sub>3</sub> melt was experimentally determined at 1773 and 1823 Kby means of slag-liquid Sn equilibrium.The activity of B<sub>2</
The distinct images of intragranular VC were observed on TEM in superalloy GH36underwent normal heat treatment and prolonged aging.The size of VC particles were