This is a material science questio please help me solve thes

This is a material science questio. please help me solve these three questions.

Using the Al-Cu phase diagram provided below, identify an alloy composition that can be most easily precipitation hardenable. Al-3%Cu Al-20%Cu Al-32% Cu Al-45%Cu Al-0.25%Cu You are a project engineer assigned to develop a long term storage cask for spent nuclear fuel. The material selected for the construction of these large storage canisters is not easily welded using common fusion welding processes. Which process would be the first one that you would evaluate? resistance welding submerged are welding friction stir welding gas-metal are welding electron beam welding In your first job, you are working for a large aerospace firm that is constructing a new regional jetliner. You are assigned the task of performing a process audit on a small heat treat company in Pennsylvania that has had several precipitation hardened spars and wing struts rejected for low hardness. During your audit, you observe that they are not properly monitoring the time that they are holding the parts at temperature. What is the condition of the aluminum alloy called? austenitizing solutionizing normalizing embrittlement overaging

Solution

Answer to 33:- (e)Electron Beam Welding is an appropriate method which is quite suitable for aerospace and nuclear industries. In this method electron beam is directed on to the joint to be welded. Large penetration is possible. No filler or flux is required. Weld Zone is narrow and weld distortions are eliminated since there will be local heating only.

Answer to 34:(c) Normalizing is the method by which hardness of aluminium parts decrease.