Quenched-in Vacancy Effect on Microstructural Evolution during Aging in β Tianium Alloy

摘要

A βtype titanium alloy, Ti-15V-3Cr-3Sn-3Al, shows a variety of aged microstruc- tures depending on treamtents prior to aging. When the alloy is solution treated at temperatures just above the βtransus, precipitation during aging is sluggish and heterogeneous. Meanwhile, the alloy solution treated at high temperatures in the β region exhibits very accelerated and very homogeneous precipitation. In the mate- rials having larger grains, there is a tendency that fine and homogenoeus precipita- tion takes place inside the β grins and the precipitation free zones are formed along the βgrain boundaries.