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The Observation of Slip Phenomena in Single Crystal Fe Samples During In Situ Micro-Mechanical Testing Through Orientation Imaging

Published online by Cambridge University Press:  25 June 2014

Dhriti Bhattacharyya ,
Robert W. Wheeler ,
Robert P. Harrison  and
Lyndon Edwards
Dhriti Bhattacharyya*
Affiliation:
Australian Nuclear Science and Technology Organization, Lucas Heights, New Illawarra Road, NSW 2234, Australia
Robert W. Wheeler
Affiliation:
MicroTesting Solutions, LLC, Hilliard, OH 43206, USA
Robert P. Harrison
Affiliation:
Australian Nuclear Science and Technology Organization, Lucas Heights, New Illawarra Road, NSW 2234, Australia
Lyndon Edwards
Affiliation:
Australian Nuclear Science and Technology Organization, Lucas Heights, New Illawarra Road, NSW 2234, Australia
*
*Corresponding author. [email protected]
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Abstract

This paper reports a study of local orientation change occurring within micro-scale tensile samples as a function of strain. These samples were fabricated from a thin film of single crystal bcc Fe and deformed in tension using an in situ micro-mechanical testing device inside a scanning electron microscope. Samples were loaded along the <110> direction parallel to the specimen axis, strained to different levels, and then subjected to electron backscatter diffraction scans over the entire area of the gauge section. Analysis of the surface orientation data shows that, within a necked zone of the micro-sample gauge section, there are two distinct regions of significant orientation change, in which local crystal rotations occur in opposite directions. These two regions are separated by an intermediate band that shows minimal misorientation from the original state. Crystal rotations within the two regions that develop opposite orientations are found to be consistent with classic single crystal slip, where the slip direction rotates toward the tensile axis. It is shown that increasing tensile strain causes an increasing degree of rotation away from the starting orientation. The tests also illustrate the occurrence of slip on at least two different slip systems, based on the slip traces and orientation change.

Keywords

in situ testingmicro-mechanical testingEBSDscanning electron microscopydeformation mechanismssingle crystal Fe
Type
FEMMS Special Issue
Information
Microscopy and Microanalysis , Volume 20 , Issue 4 , August 2014 , pp. 1060 - 1069
Copyright
© Microscopy Society of America 2014 

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