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Nano-sized dispersoids formed by solid state reactions in mechanically alloyed aluminum based materials

Research Project

Project/Area Number 08650853
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionNihon University

Principal Investigator

KANEKO Junichi  Department of Mechanical Engineering, College of Industrial Technology, Professor, 生産工学部, 教授 (00120410)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,800,000 (Direct Cost: ¥1,800,000)
Keywordsmechanical alloying / powder metallurgy / nano-composite / solid state reaction / dispersion strengthening / aluminum alloy / metal oxide
Research Abstract

Mechanically alloying was carried out for the Al-Fe and Al-Mn systems from three different starting materials : (1) powders from prealloyed ingots, (2) mixed powders of pure elements and (3) pure aluminum powder with addition of oxides of alloying elements. Mechanically alloyed powders were consolidated to the P/M materials by vacuum hot pressing and hot extrusion. Structures and mechanical properties were examined on the P/M materials. It has been shown that oxide addition is an effective way to obtain materials of superior mechanical performance since dispersion of Al_2O_3 and aluminide compounds is obtained in situ by the displacement reaction of oxygen during or after mechanical alloying treatment. Furthermore, mechanically alloyed materials were produced in the Al-Cr, Al-Hf, AL-Mo, Al-Ti, Al-W, Al-Zr systems by adding the oxide of alloying elements to aluminum powder. X-ray diffraction revealed that the added oxides were discomposed and Al_2O_3 and aluminide compounds were formed … More in these materials. These aluminum alloy systems are known to be difficult to prepare by the melting and casting method because of significant differences in the density and melting point between aluminum nd slloying elements. It has been confirmed that mechanical alloying with additon of the oxides of alloying elements is an effective alloying method for such alloy systems. Since formation of dispersoids in these materials occurs by solid state reactions, the amount and average size of dispersoids can be more easily controlled than in the liquid state reactions. Thus, oxide addition enables to obtain nano-sized dispersoids formed by solid state reactions in mechanically alloyed aluminum based materials. Hardness increases were observed in many of these materials with the progress of such solid state reactions when consolidated materials were heated at very high temperatures such as 773 or 873K.The highest hardness increase of HV75 was observed in Al-Mo system when its hot-extruded material was heated at 873K for 40ks. Most of the as-extruded materials of these alloy systems showed high tensile strength above 500MPa, and thus dispersoids formed by solid state displacement ractions of oxygen in mechanically alloyed materials are shown to be effective for strengthening aluminum based materials. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] J.Kaneko, M.Sugamata and D.G.Kim: ""Age-hardening" caused by solid state veactions in mechanically alloyed aluminum based materials" Proceedings Thermec '97. 1119-1126 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Junichi Kaneko, Makoto Sugamata and Deug Gyu Kim: "Age-hardening caused by solid state reactions in mechanically alloyed aluminum based materials" Proceedings of International Conference on Thermomechanical Processing of Steels and Other Materials (Thermec'97). 1119-1126

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] J.Kaneko,M.Sugameta,D.G.Kim: ""Age-hardening" caused by solid state reactions in mechanically alloyed aluminum based meterials" Proceedings Thermec'97. 1119-1126 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 樋口博之,菅又信,金子純一: "Al-LiおよびAl-Li-Mg合金と添加酸化物との反応を利用した酸化物分散材料のメカニカルアロイングによる作製" 日本金属学会誌. 60・12. 1207-1214 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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