Title of article :
Influences of grain size and grain boundary segregation on mechanical behavior of nanocrystalline Ni
Author/Authors :
Zhang، نويسنده , , X.F. and Fujita، نويسنده , , T. and Pan، نويسنده , , D. and Yu، نويسنده , , J.S. and Sakurai، نويسنده , , T. and Chen، نويسنده , , M.W.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Abstract :
Nanocrystalline Ni with mean grain sizes ranging from ∼15 to 95 nm was fabricated by electroplating and post-annealing. The influence of annealing on deformation behavior was systematically investigated by inspecting strain rate sensitivity (m) and activation volume (V) using nanoindentation. In addition to the strong dependence of the m and V values on nanograin sizes, annealing induced grain boundary change, probably caused by GB relaxation and segregation, leads to the transition from a stress-activated dislocation emission mechanism in the as-fabricated sample to a thermal activation on dislocation emission.
Keywords :
Grain boundary microstructure , Nanocrystalline Ni , Plastic deformation mechanisms , grain size
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Journal title :
MATERIALS SCIENCE & ENGINEERING: A