Abstract
The fracture behavior of heat-treatable CuCo alloys has been examined for conditions of quasi-static and dynamic loading. The finer dimple structures and intergranular fracture surfaces observed after dynamic loading suggest that failure under these conditions is controlled primarily by microvoid nucleation along grain boundaries and at incoherent particle-matrix interfaces. Alloys in the peakaged condition exhibit a superior resistance to dynamic fracture when compared with solution-treated and with overaged alloys, suggesting vacancy trapping by coherent precipitates. Transmission electron microscopy studies revealed microvoid formation at incoherent precipitates during deformation in overaged alloys, leading to the conclusion that voids too small for detection by optical microscopy assume an important role in the initiation of ductile failure during dynamic loading.
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