Fabrication of amorphous second phase particles dispersed materials by mechanical alloying.
| Project/Area Number |
63550542
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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 |
金属材料(含表面処理・腐食防食)
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| Research Institution | Nihon University |
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Principal Investigator |
SUGAMATA Makoto Nihon University, College of Industrial Technology, Professor, 生産工学部, 教授 (90059600)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1989: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Mechanical alloying / Amorphous / Powder metallurgy / Dispersion strengthening / Intermetallic compound / Alloy powder / Aluminum alloy |
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| Research Abstract |
Amorphous intermetallic powders can be formed by mechanical alloying of crystalline intermetallic compounds. In this work, in order to disperse fine amorphous intermetallic compounds in aluminum matrix, intermetallic compounds were added to pure aluminum powders and mechanically alloyed in a high energy ball mill. Obtained MA powders were subsequently processed to P/M materials by hot extrusion with lower temperature than crystallization temperature of amorphous particles.
Powders of intermetallic compounds used for additions were TiAl_3 ZrAl_3, FeAl_3, NiAl_3, MnAl_6, CrAl_7, Co_2Al_9 and FeNiAl_9. Atomized powder of pure aluminum was blended with 10at% or 20at% of intermetallic compound. With the progress of MA, intermetallic compounds were crushed into fine particles and became dispersed in the ductile matrix of aluminum powders. Intensity of Xray diffraction peaks of crystalline intermetallic compounds decreased with MA processing. After processing MA for 24 hours, intensity of TiAl_3, ZrAl_3, FeAl_3, NIAl_3 disappeared but intensity of other intermetallic compounds were detected slightly after processing MA for 100 hours. At DSC curves of MA powder of all alloys, exothermic peak appeared. These experimental results indicate that the amorphous intermetallic particles dispersed in the aluminum matrix.
The amorphous intermetallic particles in MA powders crystallized during hot extrusion. It is necessary to consolidate the MA powders with lower temperature, for fabrication of amorphous particles dispersed aluminum materials. Extruded materials showed high strength due to fine dispersion compounds and submicron subgrain structure. Al-FeAl_3 alloy and Al-FeNiAl_9 alloy showed 47OMPa in tensile strength and 605MPa in 0.2% yield strength of compression test.
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Report
(3 results)
Research Products
(15 results)
