2001 Fiscal Year Final Research Report Summary
Sharpening of Cube Texture during Continuous Cyclic Bending Process in Aluminum-Magnesium base alloy
| Project/Area Number |
12650691
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | UTSUNOMIYA UNIVERSITY |
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Principal Investigator |
TAKAYAMA Yoshimasa Utsunomiya University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (60163325)
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| Project Period (FY) |
2000 – 2001
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| Keywords | Aluminum alloy / Continuous cyclic bending / Cube texture / Crystallite texture / Crystallite orientation distribution |
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| Research Abstract |
Continuous cyclic bending (CCB) has been recently proposed as a useful straining technique to produce the high strain on the surface and the lower strain in the central layer of the sheet. The CCB and the subsequent annealing make it possible to produce gradient microstructure with different grained layers intentionally. The aim of the present study is to clarify formation mechanism and optimum thermomechanical conditions of cube texture sharpened remarkably in the surface layer during the CCB and the annealing in an Al-Mg base alloy. The obtained results are summarized as follows :
(1) The as-received sample shows a weak cube texture in surface, middle and center layers. The 50-pass CCB leads to the sharper textures in all of the layers, especially in the surface layer. After annealing in a salt bath for 3.6 ks, the CCBent sample exhibits a typical cube texture sharpened in the surface layer.
(2) To give the CCB and the annealing once more to the CCBent and annealed sample with strong cube texture results in the increase in fraction of cube component. The increase reveals that the CCB/annealing cycles affects the cube sharpening positively.
(3) For 20-pass CCBent samples, the cube texture appears after annealing in a salt bath, while the texture is randomized after annealing both in Ar and in air.
Consequently, it is found that the cube texture is sharpened by the CCB/annealing process. The CCB/annealing process enables to control crystallite orientation distribution by means of selecting processing conditions such as number of CCB passes, annealing atmosphere, annealing time and direction of CCB, and number of the CCB/annealing cycles.
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Research Products
(14 results)
