Fracture characteristics and deformation behaviour of solution-treated Ti-15V-3Cr-3Sn-3Al alloy

The present paper elucidates the fracture characteristics of solution–treated Ti–15V–3Cr–3Sn–3Al alloy having P single phase poly–crystalline. A Charpy impact test was done at temperatures between 77 K and 473 K. Tensile tests were performed at temperatures between 77 K and 355 K with various strain rates. A marked energy transition occurred at around room temperature. Equiaxed dimples with a size identical to P grain size covered the fracture surface of a sample, which showed higher absorbed energy. On the other hand, the lower shelf fracture was due to a flat fracture surface in which micro–dimples on the order of 1 pm partly covered. Localization of plastic deformation and not 'cleavage fracture' was primarily responsible for the transition. Deformation localization was explained by the dependence of the plastic instability condition on strain rate and temperature. Plastic work for uniform deformation is considered to be sensitive to the strain rate and temperature.