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

Journal Article · Thu Oct 11 00:00:00 EDT 2012 · Scripta Mater.

DOI:https://doi.org/10.1016/j.scriptamat.2012.04.031· OSTI ID:1048972

Ligda, J P; Schuster, B E; Wei, Q ^[1]

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1. UNC

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.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: U.S. ARMY RESEARCH
• OSTI ID: 1048972
• Journal Information: Scripta Mater., Vol. 67, Issue (3) ; 08, 2012; ISSN 1359-6462
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
COMPRESSION
DEFORMATION
GRAIN SIZE
PLASTICS
SHEAR
SYNCHROTRONS
TANTALUM
TORSION
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION