Creep and fracture behavior of peak-aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct)

D. D. Yin, Q. D. Wang, C. J. Boehlert, V. Janik

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Abstract

The tensile-creep and creep-fracture behavior of peak-aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct) (WGZ1152) was investigated at temperatures between 523 K (250 C) to 598 K (325 C) (0.58 to 0.66Tm) and stresses between 30 MPa to 140 MPa. The minimum creep rate of the alloy was almost two orders of magnitude lower than that forWE54-T6 and was similar to that for HZ32-T5. The creep behavior exhibited an extended tertiary creep stage, which was believed to be associated with precipitate coarsening. The creep stress exponent value was 4.5, suggesting that dislocation creep was the rate-controlling mechanism during secondary creep. At T = 573 K (300 C), basal slip was the dominant deformation mode. The activation energy for creep (Qavg = 221 ± 20 kJ/mol) was higher than that for self-diffusion in magnesium and was believed to be associated with the presence of second-phase particles as well as the activation of nonbasal slip and cross slip. This finding was consistent with the slip-trace analysis and surface deformation observations, which revealed that the nonbasal slip was active. The minimum creep rate and time-to-fracture followed the original and modified Monkman-Grant relationships. The microcracks and cavities nucleated preferentially at grain boundaries and at the interface between the matrix phase and the second phase. In-situ creep experiments highlighted the intergranular cracking evolution.

LanguageEnglish (US)
Pages3338-3350
Number of pages13
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume43
Issue number9
DOIs
StatePublished - Sep 2012

Profile

Creep
slip
tensile creep
microcracks
magnesium
precipitates
grain boundaries
exponents
activation
activation energy
Trace analysis
cavities
matrices
Microcracks
Coarsening
Magnesium
Precipitates
Grain boundaries
Activation energy
Chemical activation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials

Cite this

Creep and fracture behavior of peak-aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct). / Yin, D. D.; Wang, Q. D.; Boehlert, C. J.; Janik, V.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 43, No. 9, 09.2012, p. 3338-3350.

Research output: Contribution to journalArticle

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