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In-situ TEM Investigation of Rapid Solidification of Aluminum and Aluminum Copper Alloys

Zweiacker, Kai (2015) In-situ TEM Investigation of Rapid Solidification of Aluminum and Aluminum Copper Alloys. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

Measuring and observing rapidly evolving interfaces of irreversible transient states such as rapid solidification have been a long time standing problem in materials science as characterization techniques that deliver the necessary requirements, i.e. nanosecond temporal and nano-meter spatial resolution, have not been present. Dynamical TEM utilizes a process initiation photon laser pulse coupled with a timed electron pulse train to observe transient states of rapidly evolving phase transformations. Nanoscale spatio-temporal resolution in-situ TEM revealed growth mode changes and enabled quantitative measurements of locally resolved instantaneous and averaged interface velocities for pure Aluminum and hypo-eutectic Aluminum-Copper alloys. Post-mortem TEM was employed to gain insights on micro-structural evolution morphology regarding texture, morphology changes, grain size and grain size development, phase formation and orientations relationships during the laser processing. Post-mortem TEM studies revealed that resultant microstructures found in thin film solidification are equivalent with microstructures found in bulk sample experimentation utilizing CW-lasers. DTEM allows systematical studies of far-from equilibrium phase transformation and were employed to investigate PL initiated directional rapid solidification in Al and Al-Cu alloys.

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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Zweiacker, Kaikwz3@pitt.eduKWZ30000-0002-4365-7374
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorWiezorek, Jorgwiezorek@pitt.eduWIEZOREK
Committee ChairBarnard, Johnjbarnard@pitt.edu JBARNARD
Committee ChairLeu, Paul W.pleu@pitt.edu PLEU
Committee ChairLee, Jung-Kunjul37@pitt.eduJUL37
Date: 9 June 2015
Date Type: Publication
Defense Date: 27 March 2015
Approval Date: 9 June 2015
Submission Date: 31 March 2015
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 134
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Materials Science and Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Rapid Solidification, RS, Dynamical TEM, Diffraction, Aluminum, Al-Cu, Precession Electron, In-situ TEM, Laser Irradiation, Materials Processing
Date Deposited: 09 Jun 2015 15:32
Last Modified: 15 Nov 2016 14:26
URI: http://d-scholarship.pitt.edu/id/eprint/24270

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