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Direct Monitoring and Quantification of Deformation Twinning in Magnesium Alloys.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Direct Monitoring and Quantification of Deformation Twinning in Magnesium Alloys./
Author:	Mo, Chengyang.
Description:	1 online resource (120 pages)
Notes:	Source: Masters Abstracts International, Volume: 56-06.
Contained By:	Masters Abstracts International56-06(E).
Subject:	Mechanical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9780355117509

Direct Monitoring and Quantification of Deformation Twinning in Magnesium Alloys.
Mo, Chengyang.

Direct Monitoring and Quantification of Deformation Twinning in Magnesium Alloys. - 1 online resource (120 pages)

Source: Masters Abstracts International, Volume: 56-06.

Thesis (M.S.)

Includes bibliographical references

Deformation twinning plays a dominant role in plastic deformation of hexagonal close-packed (hcp) polycrystalline materials. Furthermore, stain localizations were previously found to be related to twinning in Magnesium alloys. To date, experiments performed at the specimen level demonstrated the formation of strain localizations at locations with pronounced twin activity. The research work presented in this dissertation attempts to quantitatively identify correlations between strain localizations and twinning activity in magnesium. This is achieved by in-situ microstructure monitoring coupled with nondestructive evaluation techniques such as acoustic emission and digital image correlation. Characteristics of acoustic emission signals from twinning are identified through a combination of mechanical testing using a variety of specimens ranging from single to polycrystals in addition to testing both inside and outside the Scanning Electron Microscope as well as machine learning techniques. A novel approach to perform quasi in-situ cyclic loading was implemented allowing full field strain measurement as well as microstructure characterization at key stages of cyclic loading. Given this approach, the contribution of twinning in the measured plastic strain was possible to be directly calculated from microstructure information during cyclic loading conditions. In addition, such microstructure-related plastic strain was demonstrated to have strong correlation with macroscopic heterogeneous strain field measured by digital image correlation. The experimental findings in this dissertation can provide key inputs to models attempting to predict deformation behavior of magnesium alloys using microstructural information.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355117509Subjects--Topical Terms:

557493
Mechanical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Direct Monitoring and Quantification of Deformation Twinning in Magnesium Alloys.
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100 1 $a Mo, Chengyang. $3 1182251
245 1 0 $a Direct Monitoring and Quantification of Deformation Twinning in Magnesium Alloys.
264 0 $c 2017
300 $a 1 online resource (120 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 56-06.
500 $a Adviser: Antonios Kontsos.
502 $a Thesis (M.S.) $c Drexel University $d 2017.
504 $a Includes bibliographical references
520 $a Deformation twinning plays a dominant role in plastic deformation of hexagonal close-packed (hcp) polycrystalline materials. Furthermore, stain localizations were previously found to be related to twinning in Magnesium alloys. To date, experiments performed at the specimen level demonstrated the formation of strain localizations at locations with pronounced twin activity. The research work presented in this dissertation attempts to quantitatively identify correlations between strain localizations and twinning activity in magnesium. This is achieved by in-situ microstructure monitoring coupled with nondestructive evaluation techniques such as acoustic emission and digital image correlation. Characteristics of acoustic emission signals from twinning are identified through a combination of mechanical testing using a variety of specimens ranging from single to polycrystals in addition to testing both inside and outside the Scanning Electron Microscope as well as machine learning techniques. A novel approach to perform quasi in-situ cyclic loading was implemented allowing full field strain measurement as well as microstructure characterization at key stages of cyclic loading. Given this approach, the contribution of twinning in the measured plastic strain was possible to be directly calculated from microstructure information during cyclic loading conditions. In addition, such microstructure-related plastic strain was demonstrated to have strong correlation with macroscopic heterogeneous strain field measured by digital image correlation. The experimental findings in this dissertation can provide key inputs to models attempting to predict deformation behavior of magnesium alloys using microstructural information.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Mechanical engineering. $3 557493
650 4 $a Materials science. $3 557839
655 7 $a Electronic books. $2 local $3 554714
690 $a 0548
690 $a 0794
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Drexel University. $b Mechanical Engineering and Mechanics. $3 1148566
773 0 $t Masters Abstracts International $g 56-06(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10604275 $z click for full text (PQDT)