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Development of Nitrogen Concentration During Cryomilling of Aluminum Composites

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Date Issued:
2013
Abstract/Description:
The ideal properties of a structural material are light weight with extensive strength and ductility. A composite with high strength and tailorable ductility was developed consisting of nanocrystalline AA5083, boron carbide and coarser grained AA5083. The microstructure was determined through optical microscopy and transmission electron microscopy. A technique was developed to determine the nitrogen concentration of an AA5083 composite from secondary ion mass spectrometry utilizing a nitrogen ion-implanted standard. Aluminum nitride and amorphous nitrogen-rich dispersoids were found in the nanocrystalline aluminum grain boundaries. Nitrogen concentration increased as a function of cryomilling time up to 72hours. A greater nitrogen concentration resulted in an enhanced thermal stability of the nanocrystalline aluminum phase and a resultant increase in hardness. The distribution of the nitrogen-rich dispersoids may be estimated considering their size and the concentration of nitrogen in the composite. Contributions to strength and ductility from the Orowan relation can be more accurately modeled with the quantified nitrogen concentration.
Title: Development of Nitrogen Concentration During Cryomilling of Aluminum Composites.
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Name(s): Hofmeister, Clara, Author
Sohn, Yongho, Committee Chair
Suryanarayana, Challapalli, Committee Member
Coffey, Kevin, Committee Member
, Committee Member
University of Central Florida, Degree Grantor
Type of Resource: text
Date Issued: 2013
Publisher: University of Central Florida
Language(s): English
Abstract/Description: The ideal properties of a structural material are light weight with extensive strength and ductility. A composite with high strength and tailorable ductility was developed consisting of nanocrystalline AA5083, boron carbide and coarser grained AA5083. The microstructure was determined through optical microscopy and transmission electron microscopy. A technique was developed to determine the nitrogen concentration of an AA5083 composite from secondary ion mass spectrometry utilizing a nitrogen ion-implanted standard. Aluminum nitride and amorphous nitrogen-rich dispersoids were found in the nanocrystalline aluminum grain boundaries. Nitrogen concentration increased as a function of cryomilling time up to 72hours. A greater nitrogen concentration resulted in an enhanced thermal stability of the nanocrystalline aluminum phase and a resultant increase in hardness. The distribution of the nitrogen-rich dispersoids may be estimated considering their size and the concentration of nitrogen in the composite. Contributions to strength and ductility from the Orowan relation can be more accurately modeled with the quantified nitrogen concentration.
Identifier: CFE0004864 (IID), ucf:49702 (fedora)
Note(s): 2013-08-01
M.S.M.S.E.
Engineering and Computer Science, Materials Science Engineering
Masters
This record was generated from author submitted information.
Subject(s): cryomilling -- nirogen -- aluminum -- AA5083 -- SIMS -- TEM -- composite -- MMC -- trimodal -- metal matrix composite -- secondary ion mass spectrometry
Persistent Link to This Record: http://purl.flvc.org/ucf/fd/CFE0004864
Restrictions on Access: public 2013-08-15
Host Institution: UCF

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