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Formation of incoherent deformation twin boundaries in a coarse-grained Al-7Mg alloy

Abstract

Deformation twinning has rarely been observed in coarse grained Al and its alloys except under some extreme conditions such as ultrahigh deformation strain or strain rates. Here, we report that a significant amount of Σ3 deformation twins could be generated in a coarse-grained Al-7 Mg alloy by dynamic plastic deformation (DPD). A systematic investigation of the Σ3 boundaries shows that they are Σ3{112} type incoherent twin boundaries (ITBs). These ITBs have formed by gradual evolution from copious low-angle deformation bands through 〈111〉-twist Σ boundaries by lattice rotation. These findings provide an approach to generate deformation twin boundaries in high stacking fault energy metallic alloys. It is suggested that high solution content of Mg in the alloy and the special deformation mode of DPD played an important role in formation of the Σ and ITBs.

Category

Academic article

Client

  • Research Council of Norway (RCN) / 222173

Language

English

Author(s)

  • Shenbao Jin
  • Kai Zhang
  • Ruben Bjørge
  • NR Tao
  • Knut Marthinsen
  • K Lu
  • Yanjun Li

Affiliation

  • Norwegian University of Science and Technology
  • SINTEF Industry / Materials and Nanotechnology
  • China

Year

2015

Published in

Applied Physics Letters

ISSN

0003-6951

Publisher

AIP Publishing (American Institute of Physics)

Volume

107

Issue

9

View this publication at Cristin