Strengthening effects of icosahedral phase in magnesium alloys

A. Singh, M. Watanabe, A. Kato, A. P. Tsai

Research output: Contribution to journalReview articlepeer-review

10 Citations (Scopus)

Abstract

Microstructure and strength of two alloys Mg 95 Zn 4.2 Y 0.8 and Mg 92.5 Zn 6.5 Y containing icosahedral phase have been studied after extrusion at 250°C and 400°C. Due to its high symmetry and quasiperiodicity, the icosahedral phase can form strong interfaces with the matrix in various orientations. The icosahedral phase particles have a strong pinning effect on the grain boundaries that stabilizes grain size. They are resistant to coarsening, and remain hard at higher temperatures, imparting good strength with ductility at 200°C. Very few deformation structures such as high dislocation density and twins are observed after extrusion or tensile tests. c -type dislocations are commonly observed, which has important implications for greater ductility. Due to the stability of microstructure, various post-extrusion treatments are possible.

Original languageEnglish
Pages (from-to)951-956
Number of pages6
JournalPhilosophical Magazine
Volume86
Issue number6-8
DOIs
Publication statusPublished - 2006 Feb 21

ASJC Scopus subject areas

  • Condensed Matter Physics

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