|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||M-21: Plastic Flow in Cutting of Metals at Small Length Scales
||Gan Feng, Dinakar Sagapuram
|On-Site Speaker (Planned)
This research is aimed at studying the mechanics of large strain plastic deformation in metals at nanometer to micron length scales. Cutting (ultramicrotomy) using diamond and glass tools was used as an experimental framework to impose large shear deformation (shear strains in the range of 2.5 to 3.5) in thin sectioned chips (15 nm - a few microns thick). A characteristic feature of sectioned chips is the highly heterogeneous plastic flow that manifests as periodic mesoscale patterns ("furrows") on the chip free surface. Techniques to characterize chip morphology, deformation and microstructure included electron microscopy (SEM, TEM) and atomic force microscopy (AFM). The effects of length scale, cutting geometry and deformation rate on the plastic flow will be discussed. A comparison of the flow behavior in ultramicrotomy at small scales with regular metal cutting will be also made. Material systems studied include polycrystalline fcc metals: copper, aluminum and brass.
||Planned: Supplemental Proceedings volume