科研之友
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摘要
Near classical yield points were reproducibly observed at room and liquid nitrogen temperatures during tensile deformation of 170 gm thick, high-purity copper foils synthesized by magnetron sputter deposition. Uniformly distributed mobile dislocations introduced by rolling to similar to 20% reduction in thickness eliminated the yield point at both temperatures. The experimental observations clearly demonstrate that the observed yield-point behavior is a direct result of the very low initial dislocation density in these sputtered films as expected for "ideal" nanoscale microstructural materials.
- 出版日期2008-7
