Microstructural evolution and mechanical characteristics in nanocrystalline nickel with a bimodal grain-size distribution
2008; Elsevier BV; Volume: 503; Issue: 1-2 Linguagem: Inglês
10.1016/j.msea.2008.01.099
ISSN1873-4936
AutoresM.J.N.V. Prasad, Satyam Suwas, Atul H. Chokshi,
Tópico(s)Surface Treatment and Residual Stress
ResumoAn attractive microstructural possibility for enhancing the ductility of high-strength nanocrystals is to develop a bimodal grain-size distribution, in which the fine grains provide strength, and the coarser grains enable strain hardening. Annealing of nanocrystalline Ni over a range of temperatures and times led to microstructures with varying volume fractions of coarse grains and a change in texture. Tensile tests revealed a drastic reduction in ductility with increasing volume fraction of coarse grains. The reduction in ductility may be related to the segregation of sulphur to grain boundaries.
Referência(s)