Investigation on Organization Mechanisum and Deformation Properties of Feathery Crystal Structure in Al-Mg Aaloys Billets.
Project/Area Number |
61550509
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
金属加工(含鋳造)
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Research Institution | Toyama University |
Principal Investigator |
ANADA Hiroshi Faculty of Engineering , Toyama University, 工学部, 講師 (30019195)
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Co-Investigator(Kenkyū-buntansha) |
TADA Sizuo Faculty of Engineering , Toyama University, 工学部, 教授 (40019162)
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Project Period (FY) |
1986 – 1987
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Project Status |
Completed (Fiscal Year 1987)
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Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1987: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1986: ¥900,000 (Direct Cost: ¥900,000)
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Keywords | Feathery Crystal / Twin Boundeary / Multiplication of Feathery Crystal Al-Mg Alloy Growth Direction of Dendrite / Al-Mg合金 / デンドライト板の成長方向 / 再結晶 / ショックデカント法 / 一次デンドライト及び二次デンドライト / 結晶粒界 / SEM観察 / 凝固界面 |
Research Abstract |
In 1986. in order to understand the organization mecanisum of feathery crystal in Al-Mg alloys, first of all,the microscopic observation in cross section of unidirectional solidifying billets has been carried out by repeating until disappearance of twin boundary and then a rearing experiments on feathery crystal with used a seed crystal has been carried. Results were summerized as follows. (1) On formation process of twin boundary at organization of feathery crystal. it was found that the grain boundary changes to twin boundary as the grains on both sides of the boundary grow. (2) The multiplication prosess of twin boundary in feathery crystal can be classified in two types. Type I is that multiplication of twin boundary takes place on twin boundary already formed In Type II it takes place on subgrain boundary which isformed in twined crystal. (3) It was found that preferred growth orientation of feathery crystal is absent. Growth orientation of feathery crystal depends on the epitaxial growth directions of dendrait arm across the twin boundary. In 1987. in order to understand the deformation propertis of Al-Mg billets having feathery crystals recrystallization and tensile tests have been caried out. The recrystallization temperature and curves are not influenced by feathery structure. however recrystallized grains in feathery crystal billets are more homogeneous and finer than in the granular or columnar billets. The feathery crystal billets are more extensible as compeared with other structural billets. particurarly the featery specimen which is cut parallel to the billet axis and deformed to the<110>.direction on twin plane shows the lagest elongation of about 63% in all specimens at room temperature.
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Report
(2 results)
Research Products
(8 results)