The microstructural characteristics of ultrafine-grained nickel

Loading...
Thumbnail Image
Authors
Zhilyaev, A.P.
Kim, B.-K.
Szpunar, J.A.
Baró, M.D.
Langdon, T.G.
Subjects
Nickel
Equal channel angular pressing (ECAP)
High pressure torsion (HPT)
Differential scanning calorimetry (DSC)
Orientation imaging microscopy (OIM)
Advisors
Date of Issue
2005
Date
Publisher
Elsevier
Language
Abstract
Adetailed investigationwas conducted to evaluate the microstructural characteristics in samples of pure nickel processed using three different procedures of severe plastic deformation (SPD): equal-channel angular pressing (ECAP), high-pressure torsion (HPT) and a combination of ECAP and HPT. Several different experimental techniques were employed to measure the grain size distributions, the textures, the distributions of the misorientation angles and the boundary surface energies in the as-processed materials. It is shown that a combination of ECAP and HPT leads both to a greater refinement in the microstructure and to a smaller fraction of boundaries having low angles of misorientation. The estimated boundary surface energies were higher than anticipated from data for coarse-grained materials and the difference is attributed to the non-equilibrium character of many of the interfaces after SPD processing.
Type
Article
Description
Series/Report No
Department
Department of Mechanical and Astronautical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Materials Science and Engineering A, v. 391, 2005, pp. 377-389
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Collections