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Erschienen in: Metallurgical and Materials Transactions A 1/2013

01.01.2013

Room Temperature Shear Band Development in Highly Twinned Wrought Magnesium AZ31B Sheet

verfasst von: Jon Scott, Michael Miles, David Fullwood, Brent Adams, Ali Khosravani, Raja K. Mishra

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 1/2013

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Abstract

Failure mechanisms were studied in wrought AZ31B magnesium alloy after forming under different strain paths. Optical micrographs were used to observe the shear band formation and regions of high twin density in samples strained under uniaxial, biaxial, and plane strain conditions. Interrupted testing at 4 pct effective strain increments, until failure, was used to observe the evolution of the microstructure. The results showed that shear bands, with a high percentage of twinned grains, appeared early in the samples strained under biaxial or plane strain tension. These bands are similar to those seen in uniaxial tension specimens just prior to failure where the uniaxial tensile ductility was much greater than that observed for plane strain or biaxial tension conditions. A forming limit diagram for AZ31B, which was developed from the strain data, showed that plane strain and biaxial tension had very similar limit strains; this contrasts with materials like steel or aluminum alloys, which typically have greater ductility in biaxial tension compared to plane strain tension.

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Metadaten
Titel
Room Temperature Shear Band Development in Highly Twinned Wrought Magnesium AZ31B Sheet
verfasst von
Jon Scott
Michael Miles
David Fullwood
Brent Adams
Ali Khosravani
Raja K. Mishra
Publikationsdatum
01.01.2013
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 1/2013
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-012-1405-0

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