Schematic of the sample-heater assembly for planar impact experiments with sample preheating.
Experimental velocity profiles obtained after weak impacts with the samples of PT.
Experimental velocity profiles obtained after strong impacts with the samples of PT (left) and the samples of titanium of commercial purity.
Amplitudes of the elastic precursor waves of the PT samples (triangles) and the samples of titanium of commercial purity (circles). Triangles “up” and “down” correspond to the strong and weak shots, respectively. Here and in what follows, the curves connecting the experimental points were drawn to help the eye. The inset shows the schematics of the determination.
Velocity pull backs obtained with the PT samples (triangles) and the samples of titanium of commercial purity (circles). The inset shows the schematics of the determination.
Time-distance diagram of weak impact experiment with PT (PTDX shot, profile in Fig. 2). Thick solid and dashed characteristics correspond to the elastic precursor wave and unloading wave, respectively.
Temperature dependences of velocities of propagation of elastic and plastic waves in titanium (small filled circles) together with the data of Refs. 28 and 29 obtained with a polycrystalline titanium sample and calculated for an aggregate of single crystals . The large circles are the ultrasonic data of Table I. The larger error bar of data reflects the uncertainty of the departure from .
The temperature dependence of the yield strength of PT and titanium of commercial purity. The presently obtained data are shown by open triangles (PT) and circles (titanium of commercial purity) connected by a solid line. Data from different literature sources (dashed lines and filled circles) are marked by corresponding reference numbers.
Variation of the strain hardening of PT (triangles) and titanium of commercial purity (open circles) with the preheat temperature. Filled circle corresponds to the strain hardening of the sample of titanium of commercial purity annealed at prior to the RT test. The inset shows the differences between post-HEL behaviors of annealed (CTAT) and unannealed (CTA) samples. The bar shows the typical uncertainty of determination.
Temperature dependence of the activation volume of PT (triangles) and titanium of commercial purity (circles). The error bar shows the typical uncertainty of the determination.
Spall strength of PT (triangles) and titanium of commercial purity (circles) as a function of the preheat temperature.
Equilibrium (solid line connecting the point of titanium transformation at normal pressure with the titanium TP) and nonequilibrium (double lines) boundaries of titanium phases on the plane. The dotted line connects the spall strength values (crosses) obtained after different shots (designated alongside the shots trajectories). The spall temperature corresponds to the spall stress (negative) on the shot trajectory.
Physical properties of “as received” titanium samples.
Parameters of the planar impact experiments with preheated titanium samples.
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