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Work hardening during pyramidal slip in zinc


Ahmed, Nazeer (1965) Work hardening during pyramidal slip in zinc. Engineer's thesis, California Institute of Technology. doi:10.7907/92AW-H890.


NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The elastic stress field and energy associated with an infinite straight edge dislocation in a hexagonal crystal parallel to the line of intersection of the (0001) and the [...] planes with its Burger's Vector in the [...] plane and the [...] direction is determined taking into account the anisotropy of the crystal. The nature of the solution is found to depend on the relative numerical values of the five independent elastic constants. All possible solutions are investigated and the solution for an isotropic crystal determined as a limiting case. The interaction force between two edge dislocations of opposite sign gliding on consecutive glide planes is studied. Expressions for the total energy of such a dislocation dipole are developed. Numerical results are given at three temperatures,-77[degrees]C, 31[degrees]C and 139[degrees]C. These results are used to develop a quantitative theory of strain hardening in a single zinc crystal subjected to uniaxial tension or compression in the direction of its crystallographic axis. It is proposed that such strain hardening is produced by the dislocation dipoles that are formed on dislocations which are moving on any one of the six [...] pyramidal planes when they intersect similar dislocations which are moving on other planes of the same type. The density of such dislocation dipoles as a function of the uniaxial strain along the crystallographic axis is determined and possible future avenues of research that could utilize these results indicated.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:Aeronautical Engineering
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Wood, David Shotwell
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 November 1964
Record Number:CaltechETD:etd-12062002-155405
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4804
Deposited By: Imported from ETD-db
Deposited On:16 Dec 2002
Last Modified:21 Dec 2019 04:50

Thesis Files

PDF (Ahmed_n_1965.pdf) - Final Version
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