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The Resource Activation energy for recrystallization in rolled silver, by Krishan K. Tangri

Activation energy for recrystallization in rolled silver, by Krishan K. Tangri

Creator
Author
Summary
"In several metals the process of recrystallization is accompanied by a change in the orientation of the recrystallized material with respect to the cold rolled material. If the change is sufficiently large, the changing position of the crystals can be determined by measuring the change in the intensity of the characteristic Bragg-reflection with a Geiger counter x-ray spectrometer. Recent determinations of the activation energies of copper and a 50/50 iron-nickel alloy have been made by using this x-ray technique. Both of these metals show a decided shift in the orientation as the material is recrystallized. Silver was examined to find out the possibilities of application of this x-ray technique to metals with a more complex textural change. It is known that the crystalline texture in severely cold rolled silver can be described by saying that the [112] direction of the face centered cubic crystal is aligned approximately in the rolling direction and that faces of the form (110) lie approximately in the rolling plane. On complete recrystallization the [112] direction aligns itself approximately in the cross rolling direction and faces of the form (113) lie approximately in the rolling plane. This shift in the orientation from the cold rolled to the recrystallized state is a fair indication that the above mentioned x-ray technique could be applied to silver for the determination of its activation energy of recrystallization. Since recrystallization is not an instantaneous process, it may be stopped at various stages of its progress and the change in orientation determined by accurately measuring the change in the intensity of the x-ray lines. A plot of time versus percent recrystallization can thus be made. By determining these recrystallization rate curves at several temperatures, the activation energy of the process can be calculated. In this examination five different temperatures of recrystallization were employed and sufficient number of samples were prepared to follow the course of recrystallization completely by measuring the changes of x-ray line intensities at various stages. Although (220) and (113) line intensities were measured, the calculations were based on (113) line measurements, while (220) line measurements were used as a check for the (113) line values. Silver of 99.97% purity was used in this investigation. Since the recrystallization process is considerably affected by impurity content, the results of this investigation apply only to silver of a similar composition. This metal after 96.55% cold rolling was found to yield a value of 24.1 ± 1.5 Kcal/gm mole as its activation energy"--Introduction, pages 1-2
Language
eng
Work
Instance
Label
Activation energy for recrystallization in rolled silver
Title
Activation energy for recrystallization in rolled silver
Statement of responsibility
by Krishan K. Tangri
Creator
Author
Subject
Language
eng
Summary
"In several metals the process of recrystallization is accompanied by a change in the orientation of the recrystallized material with respect to the cold rolled material. If the change is sufficiently large, the changing position of the crystals can be determined by measuring the change in the intensity of the characteristic Bragg-reflection with a Geiger counter x-ray spectrometer. Recent determinations of the activation energies of copper and a 50/50 iron-nickel alloy have been made by using this x-ray technique. Both of these metals show a decided shift in the orientation as the material is recrystallized. Silver was examined to find out the possibilities of application of this x-ray technique to metals with a more complex textural change. It is known that the crystalline texture in severely cold rolled silver can be described by saying that the [112] direction of the face centered cubic crystal is aligned approximately in the rolling direction and that faces of the form (110) lie approximately in the rolling plane. On complete recrystallization the [112] direction aligns itself approximately in the cross rolling direction and faces of the form (113) lie approximately in the rolling plane. This shift in the orientation from the cold rolled to the recrystallized state is a fair indication that the above mentioned x-ray technique could be applied to silver for the determination of its activation energy of recrystallization. Since recrystallization is not an instantaneous process, it may be stopped at various stages of its progress and the change in orientation determined by accurately measuring the change in the intensity of the x-ray lines. A plot of time versus percent recrystallization can thus be made. By determining these recrystallization rate curves at several temperatures, the activation energy of the process can be calculated. In this examination five different temperatures of recrystallization were employed and sufficient number of samples were prepared to follow the course of recrystallization completely by measuring the changes of x-ray line intensities at various stages. Although (220) and (113) line intensities were measured, the calculations were based on (113) line measurements, while (220) line measurements were used as a check for the (113) line values. Silver of 99.97% purity was used in this investigation. Since the recrystallization process is considerably affected by impurity content, the results of this investigation apply only to silver of a similar composition. This metal after 96.55% cold rolling was found to yield a value of 24.1 ± 1.5 Kcal/gm mole as its activation energy"--Introduction, pages 1-2
Member of
Cataloging source
UMR
http://library.link/vocab/creatorDate
1925-
http://library.link/vocab/creatorName
Tangri, Krishan Kumar
Degree
M.S.
Dissertation year
1952.
Granting institution
University of Missouri. School of Mines and Metallurgy
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/subjectName
  • Recrystallization (Metallurgy)
  • Silver
  • Rolling (Metal-work)
Label
Activation energy for recrystallization in rolled silver, by Krishan K. Tangri
Instantiates
Publication
Note
Vita
Bibliography note
Includes bibliographical references (pages 46-48)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
933763458
Extent
1 online resource (v, 49 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations.
Specific material designation
remote
System control number
(OCoLC)933763458
Label
Activation energy for recrystallization in rolled silver, by Krishan K. Tangri
Publication
Note
Vita
Bibliography note
Includes bibliographical references (pages 46-48)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
933763458
Extent
1 online resource (v, 49 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations.
Specific material designation
remote
System control number
(OCoLC)933763458

Subject

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