Effect of Calcium Additions on Creep Properties of a Die-Cast AM50 Magnesium Alloy
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- Itoh Daigo
- Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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- Terada Yoshihiro
- Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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- Sato Tatsuo
- Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
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Tensile creep tests have been carried out for the die-cast AM50 + xCa (x=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 + xCa 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, n and Qc, against calcium concentration. It is found that the eutectic intermetallic phase covering the primary α grains detected in the AM50 + xCa 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.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 49 (9), 1957-1962, 2008
公益社団法人 日本金属学会
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詳細情報
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- CRID
- 1390001204248807168
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- NII論文ID
- 10024271565
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- NII書誌ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 9629211
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可