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The effect of microstructural parameters produced by α–β forging and heat treatment on the strength and ductility of Ti – 6Al – 4V, which is one of the typical α–β titanium alloys, has been studied. The results obtained in this study are as follows: (1) the aspect ratio of primary α (α p ) including grain boundary α decreases exponentially with the increase of the α–β forging ratio, (2) both strength and ductility have strong correlations with the aspect ratio of α p  and increase linearly with the decrease of the aspect ratio of α p , (3) strength increases with the strengthening of the matrix structure by the heat treatment without any reduction in ductility, and (4) the α p  of the lower aspect ratio restrains the growth of micro-voids, which results in improvement of both strength and ductility.

The variation of microstructure by α–β forging and its effect on the strength and ductility in Ti–6Al–4V alloy