The temperature dependence of stacking-fault energies in 11.5 and 16.0at%Al alloys was determined by means of the extended node technique using a hot stage in a 500kV electron microscope. The temperatures ranged from 20 to 700C. The stacking-fault energy increased markedly with increasing temperature above ~200C in both alloys (13.6 and 16.2mJ/m2 at 20C and 500C in 11.5at%Al and 11.7 and 16.9mJ/m2 at 20C and 700C in 16.0at%Al). The increasing rate of the stacking-fault energies was 0.9 ~ 1.0mJ/m2/100C at above ~200C in both alloys (figure 2).

Electron Microscope Study of Stacking Fault Energies in Cu-11.5 and 16.0 At. Pct Al Alloys at Temperatures between 20 and 700°C. T,Hasegawa, K.Asou, S.Karashima: Metallurgical Transactions, 1974, 5[4], 933-8

Figure 2

Stacking-Fault Energy of Cu-11.5Al (o) and Cu-16at%Al (•)