Yin, D. D., Wang, Q. D., Boehlert, C. J. and Janik, Vit. (2012) Creep and fracture behavior of peak-aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct). Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, Vol.43 (No.9). pp. 3338-3350. ISSN 1073-5623

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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 0.66 T m) and stresses between 30 MPa to 140 MPa. The minimum creep rate of the alloy was almost two orders of magnitude lower than that for WE54-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 (Q avg = 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.

Item Type:	Journal Article
Subjects:	T Technology > TN Mining engineering. Metallurgy
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH):	Magnesium alloys -- Creep, Magnesium alloys -- Testing
Journal or Publication Title:	Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science
Publisher:	Springer New York LLC
ISSN:	1073-5623
Date:	31 March 2012
Volume:	Vol.43
Number:	No.9
Page Range:	pp. 3338-3350
Identification Number:	10.1007/s11661-012-1131-7
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), China. Guo jia ke xue ji shu bu [Ministry of Science and Technology], Shanghai Shi ke xue ji shu wei yuan hui [Shanghai Science and Technology Commission]
Grant number:	51074106 (NSFC), 2009AA033501 (MST), 2011BAE22B01-5 (MST), 06SR07104 (SSTC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/48620

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