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Vacancy Defect and Microstructure Evolution in High Entropy Alloys.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Vacancy Defect and Microstructure Evolution in High Entropy Alloys./
Author:	Harms, Arron M.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	45 p.
Notes:	Source: Masters Abstracts International, Volume: 58-04.
Contained By:	Masters Abstracts International58-04(E).
Subject:	Materials science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13422485
ISBN:	9780438808874

Vacancy Defect and Microstructure Evolution in High Entropy Alloys.
Harms, Arron M.

Vacancy Defect and Microstructure Evolution in High Entropy Alloys. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 45 p.

Source: Masters Abstracts International, Volume: 58-04.

Thesis (M.S.)--University of Wyoming, 2018.

Single-phase high entropy alloys (SP-HEAs) are novel metals with outstanding mechanical properties, including high specific strength, excellent ductility across a wide temperature range, superconductivity, low density, and more. These alloys consist of multiple elements (five or more) in near-equal proportions, thus providing a large phase space to prepare variety of alloys of different compositions. Most importantly, some early results show that these materials may have high resistance to radiation damage making them promising candidates for use in next-generation nuclear reactors. However, some SP-HEAs have been shown to undergo phase transition under irradiation, transitioning from a single disordered phase system to various ordered phases. This phase change prompts changes in important material properties that dictate their ability to maintain resistance to radiation damage. In this work, using atomistic simulations, we elucidate the effect of order/disorder on the point defect energetics and microstructure evolution, and demonstrate the differences arising due to different atomic order towards radiation tolerance. Findings include the complete lack of vacancy cluster formation in L10-ordered NiFe alloy compared to disordered NiFe system, distinct pinning effect of Cr in pure metals as well as ordered and disordered alloys, and a connection between bulk diffusion and microstructure evolution. The results advance the understanding of the effect of atomic ordering on microstructure and defect evolution in HEAs.

ISBN: 9780438808874Subjects--Topical Terms:

557839
Materials science.

Vacancy Defect and Microstructure Evolution in High Entropy Alloys.
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520 $a Single-phase high entropy alloys (SP-HEAs) are novel metals with outstanding mechanical properties, including high specific strength, excellent ductility across a wide temperature range, superconductivity, low density, and more. These alloys consist of multiple elements (five or more) in near-equal proportions, thus providing a large phase space to prepare variety of alloys of different compositions. Most importantly, some early results show that these materials may have high resistance to radiation damage making them promising candidates for use in next-generation nuclear reactors. However, some SP-HEAs have been shown to undergo phase transition under irradiation, transitioning from a single disordered phase system to various ordered phases. This phase change prompts changes in important material properties that dictate their ability to maintain resistance to radiation damage. In this work, using atomistic simulations, we elucidate the effect of order/disorder on the point defect energetics and microstructure evolution, and demonstrate the differences arising due to different atomic order towards radiation tolerance. Findings include the complete lack of vacancy cluster formation in L10-ordered NiFe alloy compared to disordered NiFe system, distinct pinning effect of Cr in pure metals as well as ordered and disordered alloys, and a connection between bulk diffusion and microstructure evolution. The results advance the understanding of the effect of atomic ordering on microstructure and defect evolution in HEAs.
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