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Dynamic Tensile Response of Rolled Magnesium Alloy AZ31B : = Connecting Failure to Crystallographic Orientation.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Dynamic Tensile Response of Rolled Magnesium Alloy AZ31B :/
Reminder of title:	Connecting Failure to Crystallographic Orientation.
Author:	Matejunas, Andrew J.
Description:	1 online resource (52 pages)
Notes:	Source: Masters Abstracts International, Volume: 56-04.
Contained By:	Masters Abstracts International56-04(E).
Subject:	Mechanical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781369768053

Dynamic Tensile Response of Rolled Magnesium Alloy AZ31B : = Connecting Failure to Crystallographic Orientation.
Matejunas, Andrew J.

Dynamic Tensile Response of Rolled Magnesium Alloy AZ31B :Connecting Failure to Crystallographic Orientation. - 1 online resource (52 pages)

Source: Masters Abstracts International, Volume: 56-04.

Thesis (M.S.)

Includes bibliographical references

High-rate tension experiments were performed on thin foil specimens of hot rolled magnesium alloy AZ31B using a miniaturized tensile Kolskybaralong a sweep of angles in normal-rolling plane at strain rates of nominally 104 s-1. The specimens were machined with a cross section of 0.5 mm x 0.2 mm and a 1 mm gage length. The hexagonal close-packed crystalline structure of magnesium alloys causes strong anisotropy in the mechanical response where the strong basal texture along the rolling plane normal imparted by the rolling process allows for investigation into the effects of loading orientation with respect to the c-axis. Analysis of stress--strain results demonstrated a reduced sensitivity, in both stress--strain response and strain to failure, to loading orientation in orientations that lie within 45° of the plate normal axis, and that exhibit profuse extension twinning, when compared with orientations in which extension twinning exhibited less activity. A simplified Schmid factor analysis was performed and suggested that non-basal slip dominates deformation in orientations that do not promote extension twinning, and that the reduction in flow stress between the rolling direction and 45o results from an increasing activity of basal slip. In orientations that readily twin, the Schmid factor analysis suggested that early deformation was primarily accommodated by basal slip, with non-basal slip activating around 18% strain and resulting in a two stage strain hardening behavior. Additionally postmortem measurement of the failure surfaces showed a similar trend with failure surfaces tending to propagate along at angles of nearly 90° from the plate normal axis in profusely twinned specimens, which corresponds to the untwinned basal planes as well as twinned prismatic planes. These preferential failure angle results showed a strong correlation with a reduced order plasticity model for magnesium polycrystals developed by (Lloyd and Priddy 2017). Schmid factor analysis on the failed specimens suggested that failure may be due to combination of localization along a combination of untwinned basal planes and twinned prismatic planes in orientations with a high propensity for twinning. No preferential failure behavior was found for orientations that do not exhibit strong extension twinning behavior.

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

Mode of access: World Wide Web

ISBN: 9781369768053Subjects--Topical Terms:

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

554714
Electronic books.

Dynamic Tensile Response of Rolled Magnesium Alloy AZ31B : = Connecting Failure to Crystallographic Orientation.
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100 1 $a Matejunas, Andrew J. $3 1182204
245 1 0 $a Dynamic Tensile Response of Rolled Magnesium Alloy AZ31B : $b Connecting Failure to Crystallographic Orientation.
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300 $a 1 online resource (52 pages)
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500 $a Source: Masters Abstracts International, Volume: 56-04.
500 $a Adviser: Jamie Kimberley.
502 $a Thesis (M.S.) $c New Mexico Institute of Mining and Technology $d 2017.
504 $a Includes bibliographical references
520 $a High-rate tension experiments were performed on thin foil specimens of hot rolled magnesium alloy AZ31B using a miniaturized tensile Kolskybaralong a sweep of angles in normal-rolling plane at strain rates of nominally 104 s-1. The specimens were machined with a cross section of 0.5 mm x 0.2 mm and a 1 mm gage length. The hexagonal close-packed crystalline structure of magnesium alloys causes strong anisotropy in the mechanical response where the strong basal texture along the rolling plane normal imparted by the rolling process allows for investigation into the effects of loading orientation with respect to the c-axis. Analysis of stress--strain results demonstrated a reduced sensitivity, in both stress--strain response and strain to failure, to loading orientation in orientations that lie within 45° of the plate normal axis, and that exhibit profuse extension twinning, when compared with orientations in which extension twinning exhibited less activity. A simplified Schmid factor analysis was performed and suggested that non-basal slip dominates deformation in orientations that do not promote extension twinning, and that the reduction in flow stress between the rolling direction and 45o results from an increasing activity of basal slip. In orientations that readily twin, the Schmid factor analysis suggested that early deformation was primarily accommodated by basal slip, with non-basal slip activating around 18% strain and resulting in a two stage strain hardening behavior. Additionally postmortem measurement of the failure surfaces showed a similar trend with failure surfaces tending to propagate along at angles of nearly 90° from the plate normal axis in profusely twinned specimens, which corresponds to the untwinned basal planes as well as twinned prismatic planes. These preferential failure angle results showed a strong correlation with a reduced order plasticity model for magnesium polycrystals developed by (Lloyd and Priddy 2017). Schmid factor analysis on the failed specimens suggested that failure may be due to combination of localization along a combination of untwinned basal planes and twinned prismatic planes in orientations with a high propensity for twinning. No preferential failure behavior was found for orientations that do not exhibit strong extension twinning behavior.
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 New Mexico Institute of Mining and Technology. $b Mechanical Engineering. $3 1179015
773 0 $t Masters Abstracts International $g 56-04(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10276212 $z click for full text (PQDT)