Transition in the deformation mode of nanocrystalline tantalum processed by high-pressure torsion

• DOI: 10.1016/j.scriptamat.2012.04.031
• Publication Date: 2012-05-02T23:55:44Z
• Authors: J.P. Ligda; B.E. Schuster; Q. Wei
• Keywords: 02 engineering and technology; 0210 nano-technology

We present quasi-static room temperature compression and nanoindentation data for nanocrystalline and ultrafine grained tantalum processed by high-pressure torsion. Because bulk samples possess an inherent gradient in properties, microstructures were characterized using site-specific transmission electron microscopy and synchrotron X-ray diffraction. Nanocrystalline Ta shows appreciable homogeneous plastic deformation in compression; however, specimens with the smallest grain sizes exhibit localized plastic deformation via shear bands. Microstructural changes associated with this transition in deformation mode are discussed.