THE FATIGUE PROPERTIES OF SOME Cu-Zn-Al SHAPE MEMORY ALLOYS

The fatigue behavior of shape-memory alloys

“…Fatigue data on polycrystalline Cu-Zn-Al alloys have been reported by Melton and Mercier, 16 Delaey et al, 26 Janssen et al, 27 Oshima and Yoshida, 28 and Thumann and Hornbogen. 29 Fatigue studies have been performed by Brown on closely related polycrystalline Cu-Zn-Sn, 30 Ti-50.0at % Ni 673 K-3.6ks…”

“…Janssen et al 27 studied the effects of grain size and other variables on the fatigue life of a number of Cu-Zn-Al alloys using load-controlled tension testing (R = 0). Results are given in Figure 9a for the stress amplitude versus cycles to failure.…”

Thermal and Mechanical Fatigue of Shape Memory Alloys

“…Intramartensitic deformation is also present in this case (7). Deformation mechanisms found in single crystals should play a dominant role here.…”

“…Most of the works however, have been performed in polycrystals (6,7,8). Grain boundaries in bcc long range ordered shape memory alloys provide sites of severe incompatibility because of the high elastic anisotropy.…”

Two- and Three-Dimensional Grain Growth in the Cu–Al–Mn Shape Memory Alloy

“…9,13) For ductile CuAlMnbased SMAs, meanwhile, their superelastic behavior has been systematically investigated for wire samples in a range of 0.06 < d/D < 7 (4801480 µm in wire diameter D, and 60 7000 µm in mean grain diameter d) 14) and for sheet samples in the range of 0.18 < d/ª < 15.4 (about 250 µm in thickness ª, and 504000 µm in mean grain diameter d).…”