Abstract
In this work, influence of heating temperature and cooling rate on microstructure and mechanical properties of a Ti–6Al–1V–4Mo–Si alloy was investigated. The samples were heated to β (1020 °C) and α + β (950 °C and 850 °C) phase field followed by furnace cooling, air cooling and oil quenching. Basketweave morphology was witnessed for samples furnace cooled from β phase field, while Widmanstatten microstructure was observed for most air-cooled samples. For samples oil quenched from β phase field, HCP martensite (αʹ) was formed, while for samples heated in α + β phase field, lamellar α with α′ was observed. Oil quenching from the β phase field resulted in high strength and low elongation. The strength decreased and elongation increased with reduction in the heating temperature. Highest elongation (~ 16%) was obtained for samples heated to 850 °C followed by furnace cooling. The elastic modulus displayed a wide range of values (70–150 GPa) depending on the processing conditions.
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