A prototype bolt shaft (assume a uniform cylinder) that is to be loaded in tension is made of a stainless steel with a yield strength of 450 MPa and has a safety factor of 3 with respect to yielding for the maximum allowable loading. Find two ductile materials that could be used to replace the steel to make the bolt lighter while maintaining the same safety factor. The new bolts will have the same length as the original but may have different diameters. What is the percent weight savings with each of the new materials? What other material properties might be important to consider before a final choice is made?