Deformation mechanisms and mechanical properties of (0001) Mg-Zn-Y 18R-LPSO single crystals

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

1 Scopus Citations
View graph of relations

Author(s)

  • W.S. Chuang
  • P.H. Lin
  • C.H. Hsieh
  • Y.H. Lin
  • K. Takagi
  • Y. Mine
  • K. Takashima

Detail(s)

Original languageEnglish
Pages (from-to)288-297
Journal / PublicationJournal of Alloys and Compounds
Volume772
Early online date10 Sep 2018
StatePublished - 25 Jan 2019

Abstract

A promising Mg-Zn-Y alloy with the long-period stacking ordered (LPSO) second phase has been developed for about twenty years. Because the LPSO phase has the unique 18R crystal structure, particularly for its packing sequence along [0001], as well as it plays an important role in strengthening mechanisms, it is interesting to clarify in terms of mechanical properties and deformation mechanisms. In this study, uniaxial micro-pillar compression tests are conducted on LPSO along the [0001] direction. At the same time, nanoindentation system equipped with the Berkovich tip is used to extract the basic mechanical properties of (0001) plane. The basal dislocations are found to be activated first, causing the bending of the sample. The bending would lead to the shear stress field downward and thus would cause the nucleation and movement of prism dislocations with [0001] Burgers vector. Prism dislocations can form the fatal 45° slip trace inside the micro-pillar and finally go through the whole sample causing fracture. The basal dislocations are found at the Zn6Y8-Mg interface which might be originated from the local strain field between them.

Research Area(s)

  • (0001) plane, 18R LPSO, Deformation mechanism, Mg alloy, Micro-pillar

Citation Format(s)

Deformation mechanisms and mechanical properties of (0001) Mg-Zn-Y 18R-LPSO single crystals. / Chuang, W.S.; Huang, J.C.; Lin, P.H.; Hsieh, C.H.; Lin, Y.H.; Takagi, K.; Mine, Y.; Takashima, K.

In: Journal of Alloys and Compounds, Vol. 772, 25.01.2019, p. 288-297.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review