Materials Science and Engineering Commons^™

Effect Of Zr Additions On Thermal Stability Of Al-Cu Precipitates In As-Cast And Cold Worked Samples, Kyle Deane, Paul G. Sanders

Michigan Tech Publications

While Zr is frequently added to Al alloys to control grain size with the formation of large (>1 μm) primary precipitates, little research has been conducted on the effect of nanoscale Al₃Zr precipitates on Al alloys. By comparing the precipitation and corresponding strength evolution between Al-Cu-Zr alloys with different Zr concentrations, the effects of Zr on Al-Cu precipitation with and without primary Al₃Zr precipitates can be observed. In the absence of these large precipitates, all Al₃Zr phases can be formed, through high temperature aging treatments, as a dispersion of nanoprecipaites inside the Al …