Predict the yield strength of the titanium in Figure 7.9 with 4 % pre-strain if the grain size is reduced to 100 nm.
What will be an ideal response?
First it is necessary to evaluate the terms ? 0 and gb k in Equation 7.3 using the SI system of units for the titanium shown in Figure 7.7 with a pre-strain of four percent. In Figure 7.7, ? 0 is the stress when the grain size becomes infinite or when d-1/2 becomes zero or 64 kg (force) per square millimeter. The SI unit is Newtons per square meter and the conversion factor from kg (force) per square millimeter is
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