The elevated-temperature mechanical behavior of peak-aged Mg-10Gd-3Y-0.4Zr Alloy

V. Janik, D. D. Yin, Q. D. Wang, S. M. He, C. J. Chen, Z. Chen, C. J. Boehlert

Research output: Contribution to journalArticle

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Abstract

Mg-10Gd-3Y-0.4Zr (wt.%) was peak-aged (solution heat-treatment at 490 °C/8. h with subsequent aging at 250 °C/16. h) and tested in tension and compression at temperatures between 25 °C and 350 °C, in fatigue at 25 °C and 300 °C, and in tensile creep at 250 °C and 300 °C. The tensile and compression testing showed high values of ultimate tensile stresses (UTS) and compressive peak stresses, both of which were above 300. MPa at temperatures up to 250 °C. At temperatures higher than 250 °C, the peak stresses rapidly decreased. The fatigue experiments indicated that the fatigue lives were not sensitive to temperatures between 25 and 300 °C. The fatigue limit was between 50 and 75. MPa. The creep experiments suggested that in the applied stress range of 30-120. MPa the dominant secondary creep deformation mechanism was dislocation climb. The dense distribution of precipitating prismatic particles in the matrix of the magnesium solid solution aided the creep resistance. In the lower-temperature and lower-applied stress creep regime (e.g. longer creep life), intensive creep cavitation was observed at the grain boundaries in the form of cavitated grain facets and a high fraction of cavitated boundaries (∼45%). In the higher-temperature and higher-stress creep regime, failure occurred in the form of mixed grain boundary cavitation and cracking. In both cases the preferred cavity and crack nucleation sites were particles of secondary phases situated on the grain boundaries or triple junctions.

LanguageEnglish (US)
Pages3105-3112
Number of pages8
JournalMaterials Science and Engineering A
Volume528
Issue number7-8
DOIs
StatePublished - Mar 25 2011

Profile

Creep
grain boundaries
Fatigue of materials
cavitation flow
Grain boundaries
Temperature
temperature
tensile creep
Cavitation
creep strength
fatigue life
tensile stress
Compression testing
magnesium
Creep resistance
flat surfaces
heat treatment
solid solutions
Tensile testing
cracks

Keywords

  • Creep resistance
  • Fatigue
  • Mg-RE-Zr alloys
  • Precipitation hardening
  • Room and elevated compression and tension mechanical properties

ASJC Scopus subject areas

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

Cite this

Janik, V., Yin, D. D., Wang, Q. D., He, S. M., Chen, C. J., Chen, Z., & Boehlert, C. J. (2011). The elevated-temperature mechanical behavior of peak-aged Mg-10Gd-3Y-0.4Zr Alloy. Materials Science and Engineering A, 528(7-8), 3105-3112. DOI: 10.1016/j.msea.2010.12.089

The elevated-temperature mechanical behavior of peak-aged Mg-10Gd-3Y-0.4Zr Alloy. / Janik, V.; Yin, D. D.; Wang, Q. D.; He, S. M.; Chen, C. J.; Chen, Z.; Boehlert, C. J.

In: Materials Science and Engineering A, Vol. 528, No. 7-8, 25.03.2011, p. 3105-3112.

Research output: Contribution to journalArticle

Janik, V, Yin, DD, Wang, QD, He, SM, Chen, CJ, Chen, Z & Boehlert, CJ 2011, 'The elevated-temperature mechanical behavior of peak-aged Mg-10Gd-3Y-0.4Zr Alloy' Materials Science and Engineering A, vol 528, no. 7-8, pp. 3105-3112. DOI: 10.1016/j.msea.2010.12.089
Janik V, Yin DD, Wang QD, He SM, Chen CJ, Chen Z et al. The elevated-temperature mechanical behavior of peak-aged Mg-10Gd-3Y-0.4Zr Alloy. Materials Science and Engineering A. 2011 Mar 25;528(7-8):3105-3112. Available from, DOI: 10.1016/j.msea.2010.12.089
Janik, V. ; Yin, D. D. ; Wang, Q. D. ; He, S. M. ; Chen, C. J. ; Chen, Z. ; Boehlert, C. J./ The elevated-temperature mechanical behavior of peak-aged Mg-10Gd-3Y-0.4Zr Alloy. In: Materials Science and Engineering A. 2011 ; Vol. 528, No. 7-8. pp. 3105-3112
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