| Project/Area Number |
04555172
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | Toyohashi University of Technology |
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Principal Investigator |
MORINAGA Masahiko Toyohashi University of Technology, Professor, 工学部, 教授 (50126950)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Hideo Sumitomo Light Metal Industries, Ltd., Senior Engineer, 技術研究所, 主任研究員
INOUE Satoshi Toyohashi University of Technology, Assistant, 工学部, 助手 (90168443)
MURATA Yoshinori Toyohashi University of Technology, Associate Professor, 工学部, 助教授 (10144213)
KOBAYASHI Toshiro Toyohashi University of Technology, Professor, 工学部, 教授 (90023324)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1993: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1992: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | Aluminium Alloys / Mechanical Properties / Electronic Structure / Molecular Orbital Method / Alloy Design |
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| Research Abstract |
A quantitative method for predicting the mechanical properties of aluminium alloys was proposed on the basis of the molecular orbital calculation of electronic structures. A new parameter which is the s-orbital energy level, Mk, of alloying elements in aluminium was introduced into this method. The compositional average of this parameter varied linearly with the yield strength and the tensile strength of commercially available wrought aluminium alloys with multiple components. Both the strain hardening and the precipitation hardening of the alloys were also treated well in terms of this parameter alone.
Furthermore, in order to understand stress corrosion cracking (SCC), local distributions of Mg atoms were investigated experimentally in Al-Mg based alloys. There was a deficient Mg region in the vicinity of beta precipitates in the grain-boundaries of these alloys. This is probably attributable to the occurrence of SCC in them because of the very weak yield strength of this region in the SCC circumstance. In addition, it was shown from the molecular orbital calculations that there is the possibility of improving the SCC resistance by the addition of Cr, Ti and Nb into aluminium alloys. Finally, employing these results several high strength aluminium alloys were designed successfully.
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