Abstract
The hot deformation behaviour and microstructural evolution in Ti–6Al–2Zr–1Mo–1V alloys have been studied using isothermal hot compression tests. The processing map was developed at a true strain of 0·7 in the temperature range 750–950°C and strain rate range 0·001–10 s−1. The corresponding microstructures were characterised by means of a metallurgical microscope. Globularisation of lamellae occurring to a greater extent in the range 780–880°C and 0·001–0·01 s−1 had a peak power dissipation efficiency of 58 at about 850°C and 0·001 s−1. The specimens deformed in 750–880°C and 0·01–10 s−1 showed an instability region of processing map, whereas the specimens deformed in 880–950°C and 1–10 s−1 indicated three kinds of flow instabilities, i.e. macro shear cracks, prior beta boundary cracks and flow localisation bands.
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