Microalloying Effects of Ca and Ni on High-Temperature Creep Behavior in Mg-Y-Zn Alloys
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- Suzuki Mayumi
- Ecomaterials Design and Process Engineering Course, Graduate School of Environmental Studies, Tohoku University
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- Tsuchida Kayo
- Ecomaterials Design and Process Engineering Course, Graduate School of Environmental Studies, Tohoku University
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- Maruyama Kouichi
- Ecomaterials Design and Process Engineering Course, Graduate School of Environmental Studies, Tohoku University
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Abstract
High temperature creep strength at 650 K and microstructures of Mg-Y-Zn-based alloys with fourth elements (nickel and calcium) have been investigated. The microalloying of 0.5 mass% calcium markedly increases the stacking fault density in the Mg-3 mass%Y-0.5 mass%Zn alloy. Furthermore, the addition of calcium can decrease the size of stacking faults. On the other hand, in the nickel-added alloy, many precipitates were formed and the estimated stacking faults density decreased significantly. The creep strength of the Mg-Y-Zn-Ca alloy is higher than that of the base alloy (Mg-3 mass%Y-0.5 mass%Zn, WZ305). Transmission electron microscopic (TEM) observations revealed that many a-dislocations on the basal planes in the magnesium matrix are extended during creep deformation in Mg-Y-Zn-based alloys. There was significant consumption of solute atoms in the matrix and deterioration of creep strength in the Mg-Y-Zn-Ni alloy, because the formation of a large number of precipitates began before creep. On the other hand, both the low mobile dislocation density and the large separation width of extended a-dislocations were observed in the Mg-Y-Zn-Ca alloy, which exhibits excellent creep strength at 650 K under 20 MPa.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 49 (5), 918-923, 2008
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390282679226074368
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- NII Article ID
- 10021146282
- 130004454005
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- NII Book ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 9480164
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed