Using the phase diagram above, for the same alloy as in the previous question (60 wt% Pb-40 wt% Mg at 300°C), what is the mass fraction of the α phase? 

Your final answer should be in decimal format, *.**

A steel component must not fail when a tensile stress of 2500 MPa is applied.  Determine the maximum allowable surface crack length in nm if the surface energy of steel is 0.20 J/m².  Assume a modulus of elasticity of 200 GPa. Round up your answer to one decimal place.

Your final answer should be in the format *.*

What measures may be taken to increase the resistance to fatigue of a metal alloy?

Give the approximate temperature, in Kelvin, at which creep deformation becomes an important consideration for titanium. The melting temperature of titanium is 1,668°C. Round your answer to one decimal place.

Your final answer should be in the format ***.*