Abstract
The paper investigates the tensile properties and formability of Ti‐6Al‐2Sn‐4Zr‐2Mo for superplastic forming (SPF) applications, using material testing, numerical modelling and forming tests. A series of constant strain rate tests were carried out, varying the strain rate and the temperature within the range 930°C to 980°C, to determine the effects of these variables on strain rate sensitivity and strain hardening. Power‐law constitutive relationships were adopted for both strain‐rate and strain hardening. The performance and finite element implementation of the latter relationships is assessed via comparisons between (i) a theoretical model of the tensile test, (ii) a finite element model of the tensile test and (iii) the tensile test data itself. Multiaxial validation of the constitutive model and associated formability window is investigated using superplastic forming trials and a two‐dimensional finite element simulation of the process.
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