The impression creep behavior and microstructure evolution of cast and cast-then-extruded Mg-10Gd-3Y-0.5Zr (wt%)

H. Wang, Q. D. Wang, C. J. Boehlert, J. Yang, D. D. Yin, J. Yuan, W. J. Ding

Research output: Contribution to journalArticle

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Abstract

The impression creep behavior of Mg-10Gd-3Y-0.5Zr (wt%, GW103) was investigated by flat cylindrical indenter experiments at temperatures ranging from 200. °C to 325. °C. The punching stresses, which were calculated based on the indenter dimensions, varied from 50. MPa to 505. MPa. Samples were examined in the peak-aged cast condition (cast-T6) and in the cast-then-extruded plus peak-aged condition (ex-T5). Using a power-law relationship, the creep stress exponent (n) varied from 1.4 to 5.1 for the cast-T6 alloy, where lower values were obtained at lower temperatures and stresses. The creep activation energy (Q) increased from 87 to 191. kJ/mol with increasing stress. For the ex-T5 alloy, the n values were 2.2, 3.4 and 3.4 at 200. °C, 250 and 300. °C, respectively. The Q value increased from 121 to 165. kJ/mol with increasing stress. However, by using a hyperbolic sine relationship, single activation energies of 93 and 134. kJ/mol were obtained for the cast-T6 and ex-T5 alloy, respectively. The zone at the edges of the indenter underwent the largest stress and strain, resulting in broken grain boundaries. Extension twinning occurred both in the zone at the edges of the indenter and underneath the indenter face for the cast alloy, while no twinning was observed for the extruded alloy. Intergranular cracking was observed in the zone at the edges of the indenter for the tests under high temperature and high stress.

LanguageEnglish (US)
Pages313-324
Number of pages12
JournalMaterials Science and Engineering A
Volume649
DOIs
StatePublished - Jan 1 2016

Profile

casts
Creep
microstructure
Microstructure
cast alloys
Twinning
twinning
Activation energy
activation energy
Punching
Temperature
Grain boundaries
grain boundaries
exponents
Experiments

Keywords

  • Impression creep
  • Mg-Gd-Y-Zr alloy
  • Microstructure evolution
  • Twinning

ASJC Scopus subject areas

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

Cite this

The impression creep behavior and microstructure evolution of cast and cast-then-extruded Mg-10Gd-3Y-0.5Zr (wt%). / Wang, H.; Wang, Q. D.; Boehlert, C. J.; Yang, J.; Yin, D. D.; Yuan, J.; Ding, W. J.

In: Materials Science and Engineering A, Vol. 649, 01.01.2016, p. 313-324.

Research output: Contribution to journalArticle

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abstract = "The impression creep behavior of Mg-10Gd-3Y-0.5Zr (wt{\%}, GW103) was investigated by flat cylindrical indenter experiments at temperatures ranging from 200. °C to 325. °C. The punching stresses, which were calculated based on the indenter dimensions, varied from 50. MPa to 505. MPa. Samples were examined in the peak-aged cast condition (cast-T6) and in the cast-then-extruded plus peak-aged condition (ex-T5). Using a power-law relationship, the creep stress exponent (n) varied from 1.4 to 5.1 for the cast-T6 alloy, where lower values were obtained at lower temperatures and stresses. The creep activation energy (Q) increased from 87 to 191. kJ/mol with increasing stress. For the ex-T5 alloy, the n values were 2.2, 3.4 and 3.4 at 200. °C, 250 and 300. °C, respectively. The Q value increased from 121 to 165. kJ/mol with increasing stress. However, by using a hyperbolic sine relationship, single activation energies of 93 and 134. kJ/mol were obtained for the cast-T6 and ex-T5 alloy, respectively. The zone at the edges of the indenter underwent the largest stress and strain, resulting in broken grain boundaries. Extension twinning occurred both in the zone at the edges of the indenter and underneath the indenter face for the cast alloy, while no twinning was observed for the extruded alloy. Intergranular cracking was observed in the zone at the edges of the indenter for the tests under high temperature and high stress.",
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AU - Wang,Q. D.

AU - Boehlert,C. J.

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AU - Yin,D. D.

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AU - Ding,W. J.

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AB - The impression creep behavior of Mg-10Gd-3Y-0.5Zr (wt%, GW103) was investigated by flat cylindrical indenter experiments at temperatures ranging from 200. °C to 325. °C. The punching stresses, which were calculated based on the indenter dimensions, varied from 50. MPa to 505. MPa. Samples were examined in the peak-aged cast condition (cast-T6) and in the cast-then-extruded plus peak-aged condition (ex-T5). Using a power-law relationship, the creep stress exponent (n) varied from 1.4 to 5.1 for the cast-T6 alloy, where lower values were obtained at lower temperatures and stresses. The creep activation energy (Q) increased from 87 to 191. kJ/mol with increasing stress. For the ex-T5 alloy, the n values were 2.2, 3.4 and 3.4 at 200. °C, 250 and 300. °C, respectively. The Q value increased from 121 to 165. kJ/mol with increasing stress. However, by using a hyperbolic sine relationship, single activation energies of 93 and 134. kJ/mol were obtained for the cast-T6 and ex-T5 alloy, respectively. The zone at the edges of the indenter underwent the largest stress and strain, resulting in broken grain boundaries. Extension twinning occurred both in the zone at the edges of the indenter and underneath the indenter face for the cast alloy, while no twinning was observed for the extruded alloy. Intergranular cracking was observed in the zone at the edges of the indenter for the tests under high temperature and high stress.

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