Suppose 11 at %% of the following elements is added to copper (forming a separate alloy with each element) without exceeding the solubility limit. Which one would be expected to give the higher strength alloy? Are any of the alloying elements expected to have unlimited solid solubility in copper?
(a) Au;
(b) Mn;
(c) Sr;
(d) Si; and
(e) Co.
