Effect of Calcium Additions on Creep Properties of a Die-Cast AM50 Magnesium Alloy
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- Itoh Daigo ITOH Daigo
- Tokyo Institute of Technology
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- Terada Yoshihiro TERADA Yoshihiro
- Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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- Sato Tatsuo SATO Tatsuo
- Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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Author(s)
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- Itoh Daigo ITOH Daigo
- Tokyo Institute of Technology
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- Terada Yoshihiro TERADA Yoshihiro
- Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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- Sato Tatsuo SATO Tatsuo
- Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
Abstract
Tensile creep tests have been carried out for the die-cast AM50 + <I>x</I>Ca (<I>x</I>=0.47, 0.95 and 1.72 mass pct) alloys in the temperatures between 423 and 523 K to elucidate the effect of calcium additions on creep properties for the AM50 alloy. The creep curve for the AM50 + <I>x</I>Ca alloys is characterized by a minimum in the creep rate followed by an extended accelerating stage, and the decrease in creep rate during transient stage becomes pronounced with calcium concentration. The creep strengthening by calcium addition is emphasized at lower stresses and lower temperatures, resulting in the positive dependence of creep parameters, <I>n</I> and <I>Q</I><SUB>c</SUB>, against calcium concentration. It is found that the eutectic intermetallic phase covering the primary α grains detected in the AM50 + <I>x</I>Ca alloys prevents the dislocation annihilation at grain boundaries. The creep strengthening by the addition of calcium results from both the solid solution strengthening of the α matrix by solute calcium and the retardation of dislocation annihilation attributed to the eutectic intermetallic phase.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 49(9), 1957-1962, 2008-09-01
The Japan Institute of Metals and Materials
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