The Effects of Cyclic Close Die Forging on Microstructure and Mechanical Properties of Ti – 5Al – 3Mo – 1.5V Alloy

Superplastic behaviour of certain metals and alloys having very fine grains, very large tensile elongations are obtained within certain temperature ranges at low strain rates. In this work, Ti – 5Al – 3Mo – 1.5V alloy was produced and studied. This paper aims to study the effects of cyclic close die forging on microstructure and mechanical properties of this alloy by considering variable parameters such as deformation temperature (T_d) from 850⁰C, 900⁰C and 950⁰C and the number of cycles performed while forging in closed die (n) of 3, 6 and 9 times. The response is average grain size (d_tb) and tensile stress (σ_b). The results indicated that the smallest average grain size 1 μm could be obtained at T_d = 900⁰C, n = 9 times and the tensile stresses are enhanced. The experimental results we obtained also suggest that the microstructure of Ti – 5Al – 3Mo – 1.5V alloy is accordant for for superplastic deformation. The superplastic forming can show maximum elongation of 1000% or more.