Type
Text
Type
Thesis
Advisor
Trelewicz, Jason R | Sampath, Sanjay.
Date
2016-12-01
Keywords
Materials Science -- Engineering | Aluminum alloys, Ball Milling, Binary alloys, Materials Science, Mechanical alloying, Planetary Ball Mill
Department
Department of Materials Science and Engineering
Language
en_US
Source
This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree.
Identifier
http://hdl.handle.net/11401/76157
Publisher
The Graduate School, Stony Brook University: Stony Brook, NY.
Format
application/pdf
Abstract
Nanocrystalline metals have useful mechanical properties such as high strength, improved wear resistance, and longer fatigue life; however, they are relatively unstable – grain boundary doping is a viable method towards stabilization [1-3]. After comparing the work of Murdoch and Schuh, that used a thermodynamic model to estimate grain boundary segregation enthalpy to the experimental work of Umbrajkar et al. | it was realized that mechanical alloying is a processing route for grain boundary stabilization [10,11]. Whether or not chemical mixing has occurred is a good indicator of a powder system’s potential for grain boundary doping. 99Al1Si, 99Al1Mg, 99Al1Zr, and 99Al11Zn were mechanically alloyed with a Retch 100 Planetary Bal Mill. The samples were then analyzed with a Rigaku Ultima III X-ray Diffractometer to determine whether or not these powder systems have chemically mixed. It was found that the 99Al1Mg powder system chemically mixed during the 8Hr, 8mL run and during the 16Hr, 16.5mL run, and the 99Al1Zr powder system chemically mixed during the 4Hr, 16.5mL run. The enthalpy of segregation values for each binary powder system correlated to the chemical mixing shown in these results. | Nanocrystalline metals have useful mechanical properties such as high strength, improved wear resistance, and longer fatigue life; however, they are relatively unstable – grain boundary doping is a viable method towards stabilization [1-3]. After comparing the work of Murdoch and Schuh, that used a thermodynamic model to estimate grain boundary segregation enthalpy to the experimental work of Umbrajkar et al. | it was realized that mechanical alloying is a processing route for grain boundary stabilization [10,11]. Whether or not chemical mixing has occurred is a good indicator of a powder system’s potential for grain boundary doping. 99Al1Si, 99Al1Mg, 99Al1Zr, and 99Al11Zn were mechanically alloyed with a Retch 100 Planetary Bal Mill. The samples were then analyzed with a Rigaku Ultima III X-ray Diffractometer to determine whether or not these powder systems have chemically mixed. It was found that the 99Al1Mg powder system chemically mixed during the 8Hr, 8mL run and during the 16Hr, 16.5mL run, and the 99Al1Zr powder system chemically mixed during the 4Hr, 16.5mL run. The enthalpy of segregation values for each binary powder system correlated to the chemical mixing shown in these results. | 97 pages
Recommended Citation
Schwab, Lacey Lynn, "Synthesis of Binary Nanocrystalline Aluminum Alloys through High Energy Ball Milling" (2016). Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions). 2100.
https://commons.library.stonybrook.edu/stony-brook-theses-and-dissertations-collection/2100