Ting Guo , Zhuokun Chen , Mengjuan Wu , Xiaofang Zhang , Yuxin Liu , Qing Zhou , Yao Li , Zhiping Sun , Yongnan Chen
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引用次数: 0
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.
期刊介绍:
This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys.
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