We have known the purple plague in chapter 5. Formation of voids in

gold-aluminum welds and sometime later, eventually failure of the weld can occur.

(a) Please explain the details of the process of purple plague by using a

picture.

b) (b) Why is this phenomenon called as the Purple Plague but not as the Pink

Plague, or the Yellow Plague?

Question 5 (20 points) We have known the purple plague in chapter 5. Formation of voids in gold-aluminum welds and sometime later, eventually failure of the weld can occur. (a) Please explain the details of the process of purple plague by using a picture. Answer: Picture: (b) Why is this phenomenon called as the Purple Plague but not as the Pink Plague, or the Yellow Plague