東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Development of an In-Situ Positron B...

Chung, Thai hang.

Linked to FindBook

Google Book

Amazon

博客來

Development of an In-Situ Positron Beamline for Materials Science.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Development of an In-Situ Positron Beamline for Materials Science./
Author:	Chung, Thai hang.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2023,
Description:	94 p.
Notes:	Source: Masters Abstracts International, Volume: 85-03.
Contained By:	Masters Abstracts International85-03.
Subject:	Quantum physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30747448
ISBN:	9798380375849

Development of an In-Situ Positron Beamline for Materials Science.
Chung, Thai hang.

Development of an In-Situ Positron Beamline for Materials Science. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 94 p.

Source: Masters Abstracts International, Volume: 85-03.

Thesis (M.S.)--Bowling Green State University, 2023.

This item must not be sold to any third party vendors.

One of the key aspects in developing advanced nuclear reactor technology is the stability of the materials, which directly impacts the reactor's lifespan. These materials are subject to coupled extreme environmental stresses such as high radiation, corrosive media, and large temperature gradients, which synergistically contribute to the buildup of defects and eventual material failure. To build a comprehensive understanding of defect evolution, it is important to study the early stages of defect evolution, beginning with the formation of vacancies, voids, dislocations, and non-equilibrium defects.{A0}On the experimental front, it is challenging to quantify these vacancy-type defects with standard characterization techniques, as it requires sub-nanometer resolution. Positron Annihilation Spectroscopy (PAS) bridges this gap, comprising a set of non-destructive techniques capable of directly detecting atomic-scale defects, at concentrations as low as 1 vacancy per ten million atoms.This thesis will detail the work done for the ongoing development of two positron beamlines, with an emphasis on the beamline used for in-situ investigations of ion-induced damage in nuclear materials. The first measurements using the newly developed beamline are presented for low-dose radiation-induced self-ion damage in Fe. Later, refinements to the apparatus and experimental design are also discussed with regards to revisiting the experiment. Additionally, two studies on a class of high-performance multi-principal element/high-entropy alloys are discussed. Using positron annihilation lifetime Spectroscopy (PALS) and Doppler broadening spectroscopy (DBS), the phase structure and chemical complexity effects on MoNbTi-based alloys are explored with evidence of radiation resistance in MoNbTiZr and MoNbTi as well as defect recovery observed in MoNbTiVZr.{A0}Finally, exploratory measurements using DBS on a ternary mutli-principal element alloys (MPEA), CoCrNi, have recently been performed on the BGSU positron beamline. Using PAS to characterize defects, we attempt to find evidence of chemical short-range order structures in CoCrNi.{A0}

ISBN: 9798380375849Subjects--Topical Terms:

726746
Quantum physics.
Subjects--Index Terms:

Positron Annihilation Spectroscopy

Development of an In-Situ Positron Beamline for Materials Science.
LDR:03410nmm a2200421 4500 001 2396782
005 20240611104939.5
006 m o d
007 cr#unu||||||||
008 251215s2023 ||||||||||||||||| ||eng d
020 $a 9798380375849
035 $a (MiAaPQ)AAI30747448
035 $a AAI30747448
040 $a MiAaPQ $c MiAaPQ
100 1 $a Chung, Thai hang. $3 3766528
245 1 0 $a Development of an In-Situ Positron Beamline for Materials Science.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2023
300 $a 94 p.
500 $a Source: Masters Abstracts International, Volume: 85-03.
500 $a Advisor: Selim, Farida.
502 $a Thesis (M.S.)--Bowling Green State University, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a One of the key aspects in developing advanced nuclear reactor technology is the stability of the materials, which directly impacts the reactor's lifespan. These materials are subject to coupled extreme environmental stresses such as high radiation, corrosive media, and large temperature gradients, which synergistically contribute to the buildup of defects and eventual material failure. To build a comprehensive understanding of defect evolution, it is important to study the early stages of defect evolution, beginning with the formation of vacancies, voids, dislocations, and non-equilibrium defects.{A0}On the experimental front, it is challenging to quantify these vacancy-type defects with standard characterization techniques, as it requires sub-nanometer resolution. Positron Annihilation Spectroscopy (PAS) bridges this gap, comprising a set of non-destructive techniques capable of directly detecting atomic-scale defects, at concentrations as low as 1 vacancy per ten million atoms.This thesis will detail the work done for the ongoing development of two positron beamlines, with an emphasis on the beamline used for in-situ investigations of ion-induced damage in nuclear materials. The first measurements using the newly developed beamline are presented for low-dose radiation-induced self-ion damage in Fe. Later, refinements to the apparatus and experimental design are also discussed with regards to revisiting the experiment. Additionally, two studies on a class of high-performance multi-principal element/high-entropy alloys are discussed. Using positron annihilation lifetime Spectroscopy (PALS) and Doppler broadening spectroscopy (DBS), the phase structure and chemical complexity effects on MoNbTi-based alloys are explored with evidence of radiation resistance in MoNbTiZr and MoNbTi as well as defect recovery observed in MoNbTiVZr.{A0}Finally, exploratory measurements using DBS on a ternary mutli-principal element alloys (MPEA), CoCrNi, have recently been performed on the BGSU positron beamline. Using PAS to characterize defects, we attempt to find evidence of chemical short-range order structures in CoCrNi.{A0}
590 $a School code: 0018.
650 4 $a Quantum physics. $3 726746
650 4 $a Nuclear physics. $3 517741
650 4 $a Condensed matter physics. $3 3173567
650 4 $a Materials science. $3 543314
650 4 $a Solid state physics. $3 518873
650 4 $a Nuclear chemistry. $3 643077
653 $a Positron Annihilation Spectroscopy
653 $a Positron beamlines
653 $a Nuclear materials
653 $a Nuclear reactor technology
653 $a Chemical complexity
690 $a 0738
690 $a 0611
690 $a 0599
690 $a 0794
690 $a 0756
710 2 $a Bowling Green State University. $b Physics. $3 3766529
773 0 $t Masters Abstracts International $g 85-03.
790 $a 0018
791 $a M.S.
792 $a 2023
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30747448