Grain size dependence of tensile behavior in nanocrystalline Ni-Fe alloys
作者： Hongqi Li , Fereshteh Ebrahimi , Hahn Choo , Peter K. Liaw
DOI: 10.1007/S10853-006-0856-3
关键词: Brittleness 、 Hardening (metallurgy) 、 Ultimate tensile strength 、 Grain size 、 Grain boundary strengthening 、 Metallurgy 、 Tensile testing 、 Strain hardening exponent 、 Nanocrystalline material 、 Materials science
摘要: The tensile behaviors of FCC Ni–Fe alloys were investigated within three grain size regimes: >100 nm, 15–100 nm, and <15 nm. results show that the nanocrystalline metals demonstrated large strain hardening rates, which increase with decreasing size. With similar size, lowing stacking-fault energy (SFE) by addition alloying element increases yield strength ability. “low” elongation is due to basic tradeoff between elongation, i.e. nanostructured are not inherently brittle. Both fracture surface observations suggest ductility increasing Furthermore, regime, exhibited real void structure; while showed concave convex features when less than critical value.
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