Publication:
Development of nanocrystalline structure in Cu during friction stir processing (FSP)

Loading...
Thumbnail Image
Authors
Su, Jian-Qing
Nelson, T.W.
McNelley, T.R.
Mishra, R.S.
Subjects
Friction stir processing (FSP)
Orientation imaging microscopy (OIM)
Grain refinement
Nanocrystalline structure
Microband
Advisors
Date of Issue
2011
Date
Publisher
Elsevier
Language
Abstract
The characteristics of microstructures at various locations behind the pin tool extraction site were studied in copper after FSP that had been conducted with continuous quenching to enhance cooling rates. The substructures initially formed around the pin tool consist of very small crystallites having sizes of a few tens of nanometers. It is proposed that the processing conditions result in formation of microband structures around pin tool in the presence of severe strain heterogeneity. The microbands appear as nano- scale elongated crystallites surrounded by high-angle boundaries. The elongated crystallites transform to nearly random oriented and equiaxed grain structures by shape adjustment during the initial stages of cooling from the peak temperature. Nanocrystalline structures ∼174 nm in size were produced in OFHC copper by FSP.
Type
Article
Description
Series/Report No
Department
Mechanical and Astronautical Engineering
Other Units
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
National Research Council
Office of Naval Research
Funder
Contract Number N00014-09-ER20201 (ONR)
Format
7 p.
Citation
J.-Q. Su, T.W. Nelson, T.R. McNelley, R.S. Mishra, "Development of nanocrystalline structure in Cu during friction stir processing (FSP)," Materials Science and Engineering, v. A528, (2011), pp. 5458-5464.
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