(1) The most important precipitation-hardening reactions are obtained with beryllium , chromium, boron, nickel, silicon, and zirconium.

(2) Her history included a relatively short period of exposure to a mixture of silica, hard metal, and beryllium .

(3) Elements such as lead, tellurium, beryllium , chromium, phosphorus, and manganese have little or no effect on the corrosion resistance of coppers and binary copper-zinc alloys.

(4) The reactive elements contained in alloys such as magnesium, strontium, sodium, calcium, beryllium , and titanium are also factors in oxide formation.

(5) The presence of alloying elements such as beryllium , chromium, silicon, and aluminum modifies the nature of the oxide, making it more tenacious.