Structural materials that are intended for service at very high temperatures are usually strengthened by precipitation hardening, using precipitates that involve substitutional solute species. Examples include the Fe-based and Ni-based 'superalloys' used in jet engines, which are strengthened by precipitates of intermetallic compounds such as Ni3Ti. Why choose precipitation hardening? Why should the precipitates employ substitutional solutes?

Determine the number of moles of air present in 1.35 l at 750 torr and 17.0°c. which equation should you use? n=pv/rt what is the number of moles present? ⇒ 0.056 mol a sample of n2 gas occupying 800.0 ml at 20.0°c is chilled on ice to 0.00°c. if the pressure also drops from 1.50 atm to 1.20 atm, what is the final volume of the gas? which equation should you use? v2= p1v1t2/p2t1 what is the final volume of the gas? ⇒ 932 ml these are the answers