Microstructural Study of Two-Phase Marbles in Simple Shear
Microstructural Study of Two-Phase Marbles in Simple Shear by Rachel V. Zucker Submitted to the Department of Earth, Atmospheric, and Planetary Sciences and the Department of Materials Science and Engineering In Partial Fulfillment of the Requirements for the Degree of ARCHNVES Bachelor of Earth, Atmospheric, and Planetary Sciences and MASSCHUSETTS INSTITUTE OF TECHNOLOGY Bachelor of Materials Science and Engineering At the Massachusetts Institute of Technology LIBRARIE May 2009 @2009 Massachusetts Institute of Technology. All Rights Reserved. Signature of Author: Department of Earth, Atnfospheric, and Planetary Sciences And Departmejof Materials Science and Engineering Certified by: I---- J. Brian Evans Professor of Earth, Atmospheric, and Planetary Sciences Thesis Supervisor Certified by: Samuel M. Allen POSC of Physical Metallurgy Thesis Supervisor Accepted by:__________________ Ac- - Samuel Bowring Chair, ComiTtee on Undergraduate Program Accepted by: Lionel C. Kimerling Professor of Materials Science and Engineering Chair, Undergraduate Committee Microstructural Study of Two-Phase Marbles in Simple Shear by Rachel V. Zucker Submitted to the Department of Earth, Atmospheric, and Planetary Sciences and the Department of Materials Science and Engineering on May 10, 2009 In Partial Fulfillment of the Requirements for the Degree of Bachelor of Earth, Atmospheric, and Planetary Sciences and Bachelor of Materials Science and Engineering ABSTRACT Microstructural and textural observations have been conducted on synthetic calcite with 20 wt% quartz deformed in simple shear using transmission electron microscopy and selected-area diffraction. The marbles were deformed at 873, 973, and 1073 K at a stress of 305, 222, and 127 MPa, respectively, and a strain rate of 1 0 -4s-1. The microstructure, shape-preferred orientation (SPO), grain aspect ratios, lattice-preferred orientation (LPO), dislocation densities, and grain sizes were compared to the results of other studies on similar carbonates deformed in triaxial loading, torsion, and simple shear.
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