Title Page
 Table of Contents
 List of Tables
 List of Figures
 Previous investigations
 Experimental procedure
 Experimental results
 Biographical sketch

Group Title: analysis of the stress-strain behavior of several grades of polycrystalline titanium and zirconium with reference to dynamic strain aging and deeformation twinning between 77 and 1000° K
Title: An Analysis of the stress-strain behavior of several grades of polycrystalline titanium and zirconium with reference to dynamic strain aging and deeformation twinning between 77 and 1000° K
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00098373/00001
 Material Information
Title: An Analysis of the stress-strain behavior of several grades of polycrystalline titanium and zirconium with reference to dynamic strain aging and deeformation twinning between 77 and 1000° K
Physical Description: xvii, 181 leaves. : illus. ; 28 cm.
Language: English
Creator: Garde, Anand Madhav, 1945- ( Dissertant )
Reed-Hill, R. E. ( Thesis advisor )
DeHoff, Robert T. ( Reviewer )
Hartley, C. S. ( Reviewer )
Varma, A. K. ( Reviewer )
Chen, Wayne H. ( Degree grantor )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1973
Copyright Date: 1973
Subjects / Keywords: Strains and stresses   ( lcsh )
Titanium   ( lcsh )
Zirconium   ( lcsh )
Dislocations in metals   ( lcsh )
Materials Science and Engineering thesis Ph. D
Dissertations, Academic -- Materials Science and Engineering -- UF
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
theses   ( marcgt )
Abstract: Constant strain rate tensile tests were conducted on several grades of polycrystalline titanium and zirconium over the temperature range 77 to 1000°K. With the help of a computer, the data were analysed by both the Crussard-Jaoul method and a modified method based on the Swift equation. Though both the methods reveal similar deformation stages, each method has advantages under specific conditions. While the results of the Crussard-Jaoul analysis are independent of the flow stress level, they are significantly affected by the prestrain and manufacturing history of the metal. The converse is true in the case of the modified method. The basic zirconium stress-strain curve when deformation primarily occurs by slip, as in longitudinal specimens at high temperatures, conforms to a single stage behavior. Whenever mechanical twinning or kinking occurs, additional deformation stages are introduced. On the other hand. titanium shows a two stage behavior above the "blue brittle" temperature. This difference in the deformation stage behavior can explain the difference in high temperature uniform elongations of titanium and zirconium. The linear work hardening rate and high uniform elongations in titanium and zirconium at low temperatures are closely related to deformation twinning. Impurities suppress deformation twinning in these metals, the effect being stronger in zirconium than in titanium. The twin volume fraction measurements of the twinned structures reveal that a constant work hardening stage is associated with a high rate of build up of the twin volume fraction. A closer examination of these structures with the help of quantitative microscopic parameters implies that geometric hardening is probably mainly responsible for the effect of twinning on the work hardening behavior of titanium and zirconium at low temperatures. At high temperatures (500-800°K) titanium exhibits significant dynamic strain aging effects. The DSA phenomena in zirconium, however, are very weak. These results indicate that while the impurity atoms interact strongly with the dislocations in titanium, this interaction is weak in zirconium. Considering the major known manifestations of dynamic strain aging, the DSA effects in titanium are comparable to those in steels. The strain rate sensitivity data, obtained from differential strain rate tests, shed light on several features of deformation of titanium and zirconium. First, they imply that the low temperature rate controlling thermally activated deformation mechanism is probably overcoming of the interstitial barrier atoms. They also indicate that below room temperature, where deformation occurs both by slip and twinning, titanium and zirconium obey the Cottrell-Stokes law. The temperature variations of the strain rate sensitivity and the work hardening rate parameter indicate that the deformation behavior of pure zirconium and pure titanium approach the characteristics of a fee metal. The effects of 77°K prestrain and prestraining in the dynamic strain aging interval on the room temperature properties of titanium were investigated. Work softening was not observed in either case. However, only the 77°K prestrain introduced significant strengthening at room temperature.
Thesis: Thesis--University of Florida.
Bibliography: Bibliography: leaves 173-180.
General Note: Typescript.
General Note: Vita.
 Record Information
Bibliographic ID: UF00098373
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 000585252
oclc - 14205761
notis - ADB3885


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Table of Contents
    Title Page
        Page i
        Page ii
        Page iii
        Page iv
    Table of Contents
        Page v
        Page vi
    List of Tables
        Page vii
    List of Figures
        Page viii
        Page ix
        Page x
        Page xi
        Page xii
        Page xiii
        Page xiv
        Page xv
        Page xvi
        Page xvii
        Page 1
        Page 2
        Page 3
    Previous investigations
        Page 4
        Page 5
        Page 6
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        Page 15
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        Page 21
    Experimental procedure
        Page 22
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    Experimental results
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    Biographical sketch
        Page 181
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