The inter-relationship between grain boundary sliding and cavitation during creep of polycrystalline copper

Grain boundary sliding in copper and its relation to cavity formation during creep

“…The larger the plastic deformation, the larger was the mean sliding distance. The longest testing times in Pettersson's work for GBS measurements were 3 h. GBS measurements after creep tests for Cu-OF have also been performed by Ayensu and Langdon at 400-600°C [12]. In this case the longest testing time was 5 h. There is obviously a need to measure grain boundary sliding during longer and more realistic creep times.…”

Modeling creep and fatigue of copper alloys

“…For a given material, the creep rate depends strongly on the applied temperature and stress level, [11,14,[23][24][25][26][27][28][29][30] . In constructing the curve fits, Q and n values were adopted if they were reported, but all of the A values had to be calculated in this work.…”

“…[15][16][17][18][19][20] (31 -80% Cold Work) Figure 3 -Temperature effect on the yield strength of Cu-Cr-Zr alloys [5,21] Figure 4 -Steady-state thermal creep laws for copper alloys [11,14,[23][24][25][26][27][28][29][30] Figure 6 -Cyclic stress-strain curves of copper alloys at ambient temperature [36,38] Figure 7(a) -Fatigue lifetime of copper alloys, based on total strain amplitude [3,6,8,42] Cu-Cr-Zr at 216 °C (Thomas, 1993) Cu-Cr-Zr at 300 °C (Taubenlat, 1984) Cu-Cr-Zr at 300 °C (Gorynin et al, 1992) GlidCop Al15 at 400 °C (Stephens et al, 1988) GlidCop Al15 at 472 °C (Broyles et al, 1996) Applied Stress (ksi) Figure 4 -Steady-state thermal creep laws for copper alloys [11,14,[23][24][25][26][27][28][29][30] 0.001 Figure 6 -Cyclic stress-strain curves of copper alloys at ambient temperature [36,38] …”

Survey of Creep Cavitation in fcc Metals

“…The model values are about C s ≈ 50 μm. These values are slightly high for the creep tests [30], but in range for slow strain tests [29] and constant stress rate tests [19].…”