Effect of deformation twin on toughness in magnesium binary alloys

Hidetoshi Somekawa, Tadanobu Inoue, Kaneaki Tsuzaki

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The impact of alloying elements on toughness was investigated using eight kinds of Mg-0.3 at.% X (X = Al, Ag, Ca, Gd, Mn, Pb, Y and Zn) binary alloys with meso-grained structures. These binary alloys had an average grain size of approximately 20 μm. The fracture toughness and crack propagation behaviour were influenced by the alloying elements; the Mg-Ag and Mg-Pb alloys had the highest and the lowest toughness amongst the alloys, respectively, irrespective of presence in their {1 0 1¯ 2} type deformation twins. The twin boundaries affected the crack propagation behaviour in most of the alloys; in contrast, not only was the fracture related to the twin boundaries, but also the intergranular fracture occurred in the alloys that included rare earth elements. The influential factor for toughness in the meso- and the coarse-grained magnesium alloys, which readily formed deformation twins during plastic deformation, was not the change in lattice parameter with chemical composition, but the twin boundary segregation energy.

Original languageEnglish
Pages (from-to)2513-2526
Number of pages14
JournalPhilosophical Magazine
Volume95
Issue number23
DOIs
Publication statusPublished - Aug 13 2015

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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