Cu-12.1Al-4.1at%Zn alloys, with a stacking-fault energy of 7mJ/m2, were rolled in liquid nitrogen. Further annealing was carried out on the cryorolled samples at various temperatures. Compared to cryorolled samples, it was found that the microhardness of the annealed ones had increased at 200C.

The Effect of Annealing on Nanostructured Copper Alloys. Y.Ren, Y.Gong, X.Wu, Y.Long, L.Cheng, X.Zhu: Advanced Materials Research, 2012, 581-582[1], 606-10

Table 1

Stacking-Fault Energies of αCu-As Alloys