Abstract
The effect of heat treatment on the tensile properties and fracture toughness of Ti-10V-2Fe-3Al, a near β titanium alloy, was studied to establish the optimum manufacturing process. Fatigue properties were also investigated using heat treated specimens specified by Aerospace Material Specifications.It is found that aging at 400°C causes embrittlement by the precipitation of extremely fine secondary α particles from the β matrix. Aging at 490°C gives the best combination of strength and fracture toughness, while aging at 600°C causes overaging. Fracture toughness obtained under as-solution treated condition is lower than that estimated from the relationship between strength and fracture toughness for materials produced with aging after solution treatment. Therefore, an adequate aging is indispensable to obtain the high strength and high fracture toughness expected from this alloy.
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