The transition of strain rate sensitivity induced by Fe solutes in electrodeposited nanocrystalline Ni–Fe alloy

Ting Guo, Zhuokun Chen, Mengjuan Wu, Xiaofang Zhang, Yuxin Liu, Qing Zhou, Yao Li, Zhiping Sun, Yongnan Chen

Research output: Contribution to journalArticlepeer-review

Abstract

A face-centered cubic nanocrystalline (NC) Ni–Fe alloy was fabricated by adjusting electrodeposition parameter. By evaluating the hardness of NC Ni–Fe via nanoindentation at the selected strain rates from 0.005 s−1 to 0.2 s−1, a transitional point of strain rate sensitivity index (m) was exhibited, contrary to the constant value that reported in other works. Based on X-ray diffraction and transmission electron microscopy analysis, which evidenced the apparent lattice expansion as much more Fe solutes dissolved in intragrain rather than grain boundary (GB), we attributed the unexpected enhancement of m value at lower strain rates to pronounced GB-mediated plasticity facilitated by residual dislocations near GBs, whilst the lower m value at higher strain rates mainly to the intragranular dislocation motions. This work contributes directly to understanding the profound effect of alloying on the mechanical behaviors of NC materials.

Original languageEnglish
Article number108389
JournalIntermetallics
Volume172
DOIs
StatePublished - Sep 2024

Keywords

  • Deformation mechanism
  • Hardness
  • Nanocrystalline alloy
  • Nanoindentation
  • Strain rate sensitivity

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