Modeling thermally-driven microstructure evolution in nanocrystalline materials
Authors
Chen, Zhanyang
ORCID
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Other Contributors
Chen, Ying
Keblinski, Pawel
Gall, Daniel
Lian, Jie
Keblinski, Pawel
Gall, Daniel
Lian, Jie
Issue Date
2018-08
Keywords
Materials engineering
Degree
PhD
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
Abstract
Solute mobility is limited in the W-based system (W-Zn for a grain boundary segregated system and W-Cr for a duplex alloy) and is relatively high in the Fe based system (Fe-Zn for a grain boundary segregated system and Fe-Au for a duplex alloy). Advanced thermal stability is observed through grain boundary segregation, where the low solute mobility system exhibits better stabilization. A pinning-depinning process is observed in the W-Zn system at low temperature, leading to a discontinuous grain growth phenomenon. Spatial grain size gradient is reduced in a pure metallic system, and the addition of solutes helps stabilize the spatial grain size gradient. In duplex alloys, the mixing enthalpy, , plays an important role in the microstructure evolution. In W-Cr system where is low, the dissolution of solutes into W matrix leads to weak solute stabilization. In Fe-Au system, a dual-phase nanocrystalline structure showing great stability against grain growth is observed.
Description
August 2018
School of Engineering
School of Engineering
Department
Dept. of Materials Science and Engineering
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
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