| Project/Area Number |
04650629
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属加工(含鋳造)
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| Research Institution | NAGOYA UNIVERSITY |
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Principal Investigator |
ISHIKAWA Takashi NAGOYA UNIVERSITY, FACULTY OF ENGINEERING, ASSOCIATE PROFESSOR, 工学部, 助教授 (60115524)
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| Co-Investigator(Kenkyū-buntansha) |
YUKAWA Nobuki NAGOYA UNIVERSITY, FACULTY OF ENGINEERING, ASSISTANT PROFESSOR, 工学部, 助手 (10202392)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | superplastic material / forging / mechanical alloying / aluminium alloy / mechanical press / fine grain size / strain rate / TEM microstructure |
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| Research Abstract |
Al-Cu-Mg and Al-Cu-Mg-Zn alloys are made by mechanical alloying process. The influence of the condition of mechanical alloying, compaction and extrusion on the superplastic behavior and microstructure of the material are investigated. Upset and spike forging are conducted by a hydraulic press (low speed) and mechanical press (high speed). The grain size isn't affected by mechanical alloying time when mechanical alloying time becomes long to some extent but there is the most suitable mechanical alloying time for superplastic elongation. The grain size becomes fine according to decrease of extrusion temperature and the fine grain is stable after the heat treatment and tensile test are carried out. The superplastic elongation of mechanically alloyed material becomes large according to the decrease of grain size. The material developed is suitable in the actual use because its tensile strength at room temperature is very high and it shows superplastic elongation in as high speed as mechanical press. The mechanism of high speed superplastic deformation is discussed by using finite element analysis. Forging limit of these materials is very high when high speed mechanical press is used.
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