Abstract
Secondary recrystallization was used to produce a large-scale molybdenum single-crystal sheet. It was found that the presence of dispersed second phases such as calcium and magnesium oxides plays an important role in the grain growth of the rolled molybdenum, initially restraining normal grain growth and hence substantially promoting abnormal grain growth at higher temperatures. The secondary recrystallization temperature was dependent on the amount of the second phase present. Consequently a large-scale single-crystal sheet (2 mm × 40 mm × 180 mm) can easily be produced from a hot-rolled molybdenum sheet doped with CaO and MgO.
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