Abstract
The orthorhombic a martensite was formed in Ti-8 mass%Mo alloy by quenching from 1223 K. The purpose of this study was to investigate phase transformation of the a martensite structure by isothermal aging. In differential scanning calorimetry curve of the quenched specimen, an exothermic peak that indicated decomposition from the a martensite to and β phases was observed near 780K. so that isothermal aging Was performed at 723 K and 923 K for 9.0 ks. Optical microscopy. X-ray diffraction and transmission electron microscopy were performed to these specimens. Band-like products that were composed of the single variant of ω phase were observed in the quenched α martensite structure. On the other hand, twins were observed in the 723 K-aged α martensite structure. The quenched a martensite structure indicated low elastic incline and good ductility, whereas the 723 K-aged α martensite stricture indicated high yield stress and brittleness. It was pointed out that the ω products were formed to relax the volume expansion from the β phase to the α martensite, and the (111)α twins were formed during the isothermal aging at 723 K with the extinction of the ω products.
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