Dynamic deformation and ballistic properties of Ti-6Al-4V alloy. 1. Ultra-high-speed exploding properties

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Dynamic deformation and ballistic properties of Ti-6Al-4V alloy. 1. Ultra-high-speed exploding properties

Lee, Y.H. / Lee, D.G. / Lee, S. / Lee, C.S. / Choi, J.H. / Hur, S.M.

The effects of microstructural morphology on ultra-high speed exploding properties of Ti-6Al-4V alloy were investigated. Exploding bridge wire (EBW) test was conducted on equiaxed and bimodal microstructures, which were processed by different heat treatments. From the test, moving velocity of free surface vs time profiles were obtained to measure strength at Hugoniot elastic limit (HEL) and spall strength and to subsequently predict ballistic mass efficiency. The EBW results indicated that impact resistance of the bimodal microstructure was better than that of the equiaxed microstructure when the measured strength at HEL and spall strength was considered. It was also learned from the observation of fractured EBW specimens that fracture occurred by the initiation and propagation of long cracks in the equiaxed microstructure, whereas a number of microcracks were formed and connected each other in a zig-zag pattern to reduce the driving force for crack propagation in the bimodal microstructure. Since the EBW test helped experimentally estimate ultra-high-speed deformation and fracture behaviour, it could be effectively used for the prediction of ballistic impact performance.