Novel Hexagonal Structure of Ultra-High Strength Magnesium-Based Alloys
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- Inoue Akihisa
- Institute for Materials Research, Tohoku University
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- Matsushita Mitsuhide
- Inoue Superliquid Glass Project, Exploratory Research for Advanced Technology,Japan Science and Technology Corporation
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- Kawamura Yoshihito
- Institute for Materials Research, Tohoku University
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- Amiya Kenji
- Inoue Superliquid Glass Project, Exploratory Research for Advanced Technology,Japan Science and Technology Corporation
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- Hayashi Kentaro
- Institute for Materials Research, Tohoku University
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- Koike Junich
- Materials Science and Engineering, Tohoku University
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Abstract
A magnesium (Mg) solid solution with a novel long periodic hexagonal structure was formed for a Mg97Zn1Y2 (at%) alloy in a rod form prepared by extrusion of atomized powders at 573 K as well as in a melt-spun ribbon form. The novel structure of the rod alloy had an ABACAB-type six layered packing with lattice parameters of a=0.322 nm and c=3×0.521 nm. The Mg phase in the extruded rod alloy had fine grain sizes of 100 to 150 nm and included cubic Mg24Y5 particles with a size of about 10 nm at volume fractions below 10%. The density (ρ) was 1.84Mg/m3. The tensile yield strength (σy) and elongation of the rod alloy were 610 MPa and 5%, respectively, and the specific strength defined by the ratio of σy to ρ was 330 MPa/(Mg/m3), being the highest among all metallic alloys. The σy is 2.7 to 8 times higher than those for conventional high-strength Mg-based alloys. The excellent mechanical properties are due to the combination of fine grain size, new long periodic hexagonal solid solution, homogeneous dispersion of fine Mg24Y5 particles inside the nano-grains and the absence of the second precipitates along the grain boundary. The new Mg-based alloy is promising for future uses in many fields.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 43 (3), 580-584, 2002
The Japan Institute of Metals and Materials
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Details
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- CRID
- 1390001204246920576
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- NII Article ID
- 10012322046
- 130004451842
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- NII Book ID
- AA1151294X
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- COI
- 1:CAS:528:DC%2BD38XjsFGrsbs%3D
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- ISSN
- 13475320
- 13459678
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- HANDLE
- 10097/52034
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- NDL BIB ID
- 6111292
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed