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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Structural engineering with NiTi. I: Basic materials characterization
Journal of Engineering Mechanics, Volume 133, No. 9, Year 2007
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Description
The overarching goal of this two-part paper is to provide a more unified understanding of NiTi shape memory alloys intended for use in structural engineering applications. Here, we present results from basic materials characterization of large diameter polycrystalline NiTi bars. Deformation processed bars with diameters of 12.7, 19.1, and 31.8mm and various heat treatments were characterized at multiple length scales. Transmission electron microscopy revealed a nanometer scale precipitate structure present in the heat-treated, but not as-received bars. Spatial crystallographic texture measurements performed with electron backscatter diffraction, reveal a 〈111〉 texture along the longitudinal bar drawing axis in the majority of the bar, with a secondary longitudinal 〈110〉 component near the center of the bars. The prominence of the 〈110〉 texture increases with decreasing bar diameter or increasing percentage of deformation processing. Transformation temperatures and hardness were measured on samples extracted from the bars and are shown to depend strongly on bar heat treatment, but not bar diameter. The fine coherent precipitate structure induced during low temperature aging places transformation temperatures in the pseudoelastic range at room temperature and can be used to tailor material hardness. © 2007 ASCE.
Authors & Co-Authors
Tyber, Jeff
United States, Atlanta
Georgia Institute of Technology
United States, Atlanta
The George W. Woodruff School of Mechanical Engineering
McCormick, Jason
Japan, Kyoto
Kyoto University
Gall, Ken
United States, Atlanta
Georgia Institute of Technology
United States, Atlanta
The George W. Woodruff School of Mechanical Engineering
DesRoches, Reginald
United States, Atlanta
Georgia Institute of Technology
Maier, J. Hans
Germany, Paderborn
Universität Paderborn
Abdel Maksoud, Alaa E.
Egypt, Cairo
Central Metallurgical Research and Development Institute
Statistics
Citations: 47
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1061/(ASCE)0733-9399(2007)133:9(1009)
ISSN:
07339399
Study Design
Cohort Study