The Modeling of the Flow Behavior Below and Above the Two‐Phase Region for Two Newly Developed Meta‐Stable β Titanium Alloys

Abstract

Isothermal hot compression tests of two promising new titanium alloys (Ti‐10 V‐1Fe‐3Al and Ti‐10 V‐2Cr‐3Al) are performed using a TA DIL805D deformation dilatometer at temperatures in and above the two‐phase α + β region (730–880 °C) at strain rates ranging from 10−3 to 10−1 s−1. Results show that the flow stress of the two alloys decreases with increasing deformation temperature and decreasing strain rate. Some of the flow curves manifest clear discontinuous yielding and flow softening, both of which are strongly affected by the deformation conditions. The flow stress behavior of these two alloys can be described very well by a hyperbolic–sine Arrhenius equation. When deforming in the α + β phase region, the deformation mechanism is governed by the bending or globularization of the α phase. When deforming in the pure β phase field, the flow behavior is mainly determined by dynamic recovery or recrystallization. The difference in alloy composition has a minor effect on their hot working behavior.

Nanomechanical Characterization of the Deformation Response of Orthotropic Ti–6Al–4V

“…[11][12][13][14][15][16] Several manufacturing processes among the aforementioned applications contemplate the implementation of material characterization procedures, either on pristine samples of the material or on previously manufactured parts. The most commonly applied experimental procedures to identify the macroscopic orthotropic elastoplastic properties of a material include monotonic tensile, [17,18] compression, [19,20] and shear [21,22] tests of material samples obtained from its orthogonal directions. The main limitations of these tests are the size of the specimens and their subsequent destruction,…”