Creep behavior of Mg-11Y-5Gd-2Zn-0.5Zr (wt.%) at 573K

D. D. Yin, Q. D. Wang, C. J. Boehlert, V. Janik, Y. Gao, W. J. Ding

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The effect of microstructure on the tensile-creep behavior of Mg-11Y-5Gd-2Zn-0.5Zr (wt.%) (WGZ1152) at 573K (0.64T m) and stresses between 30MPa and 140MPa was investigated. The minimum creep rate of the peak-aged (T6) alloy was almost two orders of magnitude lower than that for a WE54-T6 (Mg-5.2Y-3.6RE-0.5Zr (wt.%)) alloy. The peak-aged condition (T6) exhibited slightly greater creep resistance than the as-cast condition. The solution treated (T4) material exhibited the lowest creep resistance. The creep stress exponent (∼5) suggested that dislocation creep was the dominant secondary creep mechanism. The minimum creep rate and time-to-fracture could be described by the Monkman-Grant equation. An in-situ creep experiment indicated that intergranular cracking was prevalent in the tertiary creep regime and the crack propagation path tended to follow the grain boundaries.

Original languageEnglish
Pages (from-to)239-247
Number of pages9
JournalMaterials Science and Engineering A
Volume546
DOIs
Publication statusPublished - 1 Jun 2012
Externally publishedYes

Keywords

  • Creep
  • In-situ
  • Intergranular cracking
  • Long period stacking ordered (LPSO)
  • Mg-RE alloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

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