Mechanistic origin and prediction of enhanced ductility in magnesium alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Zhaoxuan Wu
  • Rasool Ahmad
  • Binglun Yin
  • Stefanie Sandlöbes
  • W. A. Curtin

Detail(s)

Original languageEnglish
Article numberA36
Journal / PublicationScience
Volume359
Issue number6374
Publication statusPublished - 26 Jan 2018
Externally publishedYes

Abstract

Pure magnesium exhibits poor ductility owing to pyramidal {c + a} dislocation transformations to immobile structures, making this lowest-density structural metal unusable for many applications where it could enhance energy efficiency. We show why magnesium can be made ductile by specific dilute solute additions, which increase the {c + a} cross-slip and multiplication rates to levels much faster than the deleterious {c + a} transformation, enabling both favorable texture during processing and continued plastic straining during deformation. A quantitative theory establishes the conditions for ductility as a function of alloy composition in very good agreement with experiments on many existing magnesium alloys, and the solute-enhanced cross-slip mechanism is confirmed by transmission electron microscopy observations in magnesium-yttrium. The mechanistic theory can quickly screen for alloy compositions favoring conditions for high ductility and may help in the development of high-formability magnesium alloys.

Citation Format(s)

Mechanistic origin and prediction of enhanced ductility in magnesium alloys. / Wu, Zhaoxuan; Ahmad, Rasool; Yin, Binglun; Sandlöbes, Stefanie; Curtin, W. A.

In: Science, Vol. 359, No. 6374, A36, 26.01.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal