Extended Data Fig. 2: Titanium dynamic strength and hardness.
From: Metals strengthen with increasing temperature at extreme strain rates
a, The impact velocity versus CoR is plotted on a double-logarithmic scale for alumina impacts on titanium substrates at 20 °C (blue) and 200 °C (red). Yd for each impact temperature is calculated to be Yd,20°C = 776 MPa and Yd,200°C = 890 MPa. Uncertainty in measured velocities is ±2%, which is on the order of the size of the data markers. b, Hd of titanium is plotted for both 20 °C (blue) and 200 °C (red). For impact at similar strain rates, the tests at 200 °C show a higher hardness, and measurement uncertainties are on the order of the size of the data markers.