Strain rate sensitivity of nanolayered Cu/X (X=Cr, Zr) micropillars: Effects of heterophase interface/twin boundary
作者： J.Y. Zhang , Y.Q. Wang , K. Wu , P. Zhang , G. Liu
DOI: 10.1016/J.MSEA.2014.06.025
关键词: Structural material 、 Composite material 、 Work (thermodynamics) 、 Phenomenological model 、 Layer (electronics) 、 Crystal twinning 、 Strain (chemistry) 、 Crystallography 、 Strain rate 、 Materials science 、 Nanocrystalline material
摘要: Abstract Manipulation of internal features, e.g., layer/twin interfaces, is standard practice in engineering structural materials to tailor their properties. In the present work, we fabricated nanotwinned (NT)- and nanocrystalline (NC)–Cu/X (X=Cr, Zr) nanolayered micropillars (NLs) with equal layer thickness ( h ) spanning from 5 125 nm. The microcompression methodology was employed investigate interfaces effects on plastic characteristics at different strain rates. Experimental results clearly unveil that Cu/X NTNLs exhibit a significant increase strength rate sensitivity (SRS) by introducing nanotwins, comparison Cu/ X NCNLs. non-monotonic evolution SRS observed explained competition between monotonically increased density decreased twin boundaries reduction feature size . Unlike enhanced NCNLs, first decreases subsequently increases reducing A phenomenological model proposed rationalize these experimental findings highlight microstructural rate-limiting processes metallic materials.
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