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Creep and Fracture Behavior of Peak-Aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct)

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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 0.66T 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.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 51074106 and No. 50971089), the Key Hi-Tech Research and Development Program of China (2009AA033501), the National Key Technology R & D Program of China (2011BAE22B01-5), and the International Cooperation Fund of Shanghai Science and Technology Committee, Shanghai/Rhone-Alpes Science and Technology cooperation fund (No. 06SR07104).

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Authors and Affiliations

  1. National Engineering Research Center of Light Alloy Net Forming and the State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China

    D. D. Yin (Ph.D. Student) & Q. D. Wang (Professor)

  2. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, 48824, USA

    C. J. Boehlert (Associate Professor)

  3. National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China

    V. Janik (Postdoctor and Senior Researcher)

  4. Innovation Centre for Diagnostics and Application of Materials, Czech Technical University in Prague, Prague, 12135, Czech Republic

    V. Janik (Postdoctor and Senior Researcher)

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  1. D. D. Yin
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Correspondence to Q. D. Wang.

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Manuscript submitted July 12, 2011.

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Yin, D.D., Wang, Q.D., Boehlert, C.J. et al. Creep and Fracture Behavior of Peak-Aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct). Metall Mater Trans A 43, 3338–3350 (2012). https://doi.org/10.1007/s11661-012-1131-7

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