Abstract
The changes in electrical resistivity and Vickers hardness during isothermal aging in near β titanium alloy Ti-10V-2Fe-3Al which is used as the aircraft structure materials are investigated. The results reveal that the electrical resistivity of this alloy decreases during isothermal aging at 603K813K, while the Vickers hardness increases during the aging. However, the both changes in electrical resistivity and Vickers hardness correspond to each other. Also, the results obtained by X-ray measurements show that the precipitation of α phase proceeds during isothermal aging. This implies that the change in the resistivity reflects the behaviour of α phase precipitation during aging. Further, from the data of the X-ray and resistivity measurements it is found that the activation energy for the precipitation has two different values depending on aging temperatures above 723K or below 663K.
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