Part 1: Answer the followings [8 marks] 1. Ali wants to consider the alloy consists of magnesium and lead in which the mass fractions of primary alpha and total alpha are 0.6 and 0.85, respectively, at 460 centigrade. Do you encourage Ali to accept it. Justify your answer. [2 marks] 2.The figure below displays the phase diagram. Identify all phase reactions that can happen (Show detailed analysis) [6] Temperature (C) 1400 S+L 1200 15 Li 1000 40 800- +4 70 600 400 200 R 20 50 Y+B 0 20 40 50 80 R Percent B Part 2: [ 7 marks] A cylindrical tool steel specimen that is 6 inch long and 0.25 inch in diameter rotates as a cantilever beam and is to be designed so that fatigue failure never occurs. Assuming that the maximum tensile and compressive stresses are equal, determine the maximum load that can be applied to the end of the beam. Please refer to the graph below. Applied stress (ksi) 120 Tool steel 100 100,000 cycle fatigue life at 90.000 psi applied stress Endurance limit = 60,000 psi 80 - Aluminum alloy 10% Number of cycles