Yield point phenomenon during strain rate change in nanocrystalline Ni–Fe

The mechanical properties of electrodeposited nanocrystalline Ni–50 wt.% Fe are compared with those of electrodeposited Ni. Load–unload experiments and strain rate jump tests demonstrate the presence of a yield point after a change in strain rate in the plastic regime. The strain rate sensitivity is considerably reduced in Ni–Fe, in spite of the smaller grain size.

Strain rate jump tests performed on Ni–Fe, revealing the presence of a yield point.Figure optionsDownload high-quality image (115 K)Download as PowerPoint slideHighlights
► We investigate the mechanical properties of nanocrystalline Ni–Fe.
► After change in strain rate a yield point is observed.
► During continuous straining no yield points are present.
► Ni–Fe has a relatively low strain rate sensitivity.