Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 46, Issue 11
Displaying 1-17 of 17 articles from this issue
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REVIEW
RESEARCH REPORT
  • Determination of forming conditions for injection molding products using aluminum sluge as material
    Isao FUKUMOTO, Tsutomu YONAHA
    1996 Volume 46 Issue 11 Pages 564-569
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.564
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    Aluminum sludge is a precipitation yielded during the acid/alkali neutralizing process of waste fluid derived from the surface treatment of aluminum sash. By heating the sludge on 1573 K for two hours, sludge is transferred into the α alumina structure. Therefore, we attempted to apply the alumina sludge as the ceramic material for injection molding. Then we investigated the optimum conditions in kneading, molding, degreasing and firing processes to get a consistently high strength of the product by using design of experiment. We could ascertain the specific factors of firing temperature and cylinder temperature which particularly affected the bending strength of the product. As a result, we were able to attain sufficient strength in the product using sludge by injection molding process.
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  • Effect of remained vanadium on microstructure and various properties of 6061 aluminum alloy
    Akiyoshi NEMURA, Takeshi OHNO, Shigeharu KAMADO, Yo KOJIMA, Ryuhei MAS ...
    1996 Volume 46 Issue 11 Pages 570-575
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.570
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    Vanadium is a useful element for the removal of silicon from the recycled aluminum melt by filtering since it reacts with silicon and forms giant intermetallic compounds. In such a procedure, vanadium may remain in the melt, but its influence on various properties of aluminum alloys has not been made clear. This study was conducted for the purpose of clarifying the influence of the remained vanadium on various properties of 6061 aluminum alloy from a view point of metallography. V2Mg3Al18, Al3V, Al–Si–V–Mg and V2Mg3Al18 compounds are crystallized by a vanadium addition to 6061 aluminum alloy. Peak hardness of the alloy with 2.79%V is lowered because both silicon and magnesium are contained in the compounds. Tensile strength and proof strength of the alloy containing vanadium more than 0.46% gradually decrease up to the vanadium content of 1.33%, at which the largest peak hardness appears, and remarkably decrease in the range over 1.33%V as vanadium content increases. Ductility, toughness and formability are largely degraded with an increase ofvanadium content. This is caused by a fact that larger amount of coarse compounds crystallize as vanadium content is higher. Consequently, it is required that vanadium content in the 6061 alloy is less than 0.2% to guarantee the elongation satisfying the JIS value.
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  • Effect of remained calcium on microstructure and various properties of 6061 aluminum alloy
    Akiyoshi NEMURA, Takeshi OHNO, Shigeharu KAMADO, Yo KOJIMA, Ryuhei MAS ...
    1996 Volume 46 Issue 11 Pages 576-581
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.576
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    Calcium is a useful element for the removal of silicon from the recycled aluminum melt by filtering since it reacts with silicon and forms giant intermetallic compounds. In such a procedure, calcium may remain in the melt, but its influence on various properties of aluminum alloys has not been made clear. This study is conducted for the purpose of clarifying the influence of the remained calcium on various properties of 6061 aluminum alloy from a view point of metallography. CaAl2Si2, Al3Fe and coarse Al–Mg–Cr–Ca–Cu compounds crystallize in 6061 aluminum alloy by the calcium addition. Silicon, which is contributable to age hardening in 6061 aluminum alloy, is largely contained in the CaAl2Si2 compound. The amount of silicon existing in the matrix as solute atoms is, therefore, remarkably reduced by the calcium addition, resulting in no age hardening in 6061 alloy with 0.76%Ca. As an amount of calcium addition increases, elongation and Charpy impact value increase, but tensile strength, proof strength and formability are markedly lowered because of increasing amount of the crystallized compounds and softening of matrix phase. It's required that calcium content in 6061 aluminum alloy is less than 0.1 mass% to guarantee tensile properties satisfying JIS values.
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  • Recycling of aluminum UBC
    Kazuhisa FUJISAWA, Toshimitsu TAKAHASHI, Tomoji TAKAHASHI, Kenji OOSUM ...
    1996 Volume 46 Issue 11 Pages 582-587
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.582
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    Used aluminum beverage cans (UBC) are able to be recycled into can body material (JIS3004) by remelting. However, in these remelting processes, such problems attributed to “paints” occur as unfavorable molten metal composition (primarily titanium) and lowering of molten metal yield. Consequently, for promoting recycling of aluminum UBC, removal of these “paints” is essential, and the paints have been removed by thermal or mechanical methods. This paper reports the development of a swell-peeling method in which paints are chemically removed. It also reports that the swel-peeling method successfully prevents the impurity element titanium from contaminating the molten metal and improves the molten metal yield simultaneously, ensuring the good possibility of promoting recycling of aluminum UBC.
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  • Removal of impurity silicon from molten aluminum alloy with compound method
    Motohiro NAGAO, Kenji OOSUMI, Takashi NAKAMURA
    1996 Volume 46 Issue 11 Pages 588-591
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.588
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    When aluminum product scrap is recycled as melting material, it is essential to control impurity elements entering the molten metal from scrap for quality assurance. To date, in order to prevent entry of impurity elements into the molten metal from scrap, solid-phase selection and liquid-phase refining have been used. When an eye is placed on the liquid-phase refining, a segregation process is adopted for manufacturing of high-purity metal, but presently, any process for removing impurity elements from the molten metal obtained by melting scrap has not yet been put in practical use. Therefore, this report places an eye on the so-called compound method. In this method, proper elements were added to the molten metal to form intermetallic compounds with impurity elements to be removed. The impurity elements were removed by removing the compounds from the molten metal. A special attention was placed on silicon as an impurity element to be removed and for an element to be added to form intermetallic compounds, calcium was chosen based on the value of standard free energy of formation ΔG0 of binary compounds containing silicon. With these elements, at least, Ca2Si and CaSi2Al2 are found to form as intermetallic compounds and the silicon concentration in the molten metal is reduced by about 50% in relative values.
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  • Plasma treatment of aluminum dross
    Akihiro TAKEUCHI, Hideaki HASHIMOTO, Kazushi TANAKA, Naoki TANAHASHI, ...
    1996 Volume 46 Issue 11 Pages 592-596
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.592
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    In the recycling process of aluminum , a waste called aluminum dross is produced. It contains many kinds of refractory compounds like aluminum oxide and nitride, chlorides, and also heavy metals. Because arc plasma can generate high temperature, 5000~10000 K, it can be used to dissolve aluminum dross which has high melting point. Aluminum dross sample, 160 g in weight, was pressed into pellets (10×50×20 (mm)) to be dropped into the plasma chamber easily. In the chamber the sample pellets were dissolved by plasma arc, and analyzed with X-ray diffraction (XRD), electron probe microanalysis (EPMA), inductively coupled plasma atomic emission spectrometry (ICP-AES), and atomic absorption spectrometry (AAS). The volume of the sample after the plasma treatment is reduced to about 40 % of that before treatment. During the plasma treatment the constituents of the sample were changed, aluminum oxide increases from 33.1 mass% to 77.1 mass%, aluminum decreases from 23.0 mass% to 1.5 mass%, nitrogen from 3.0 mass% to 0.9 mass%, chlorine from 7.32 mass% to 0.0080 mass% (=80 ppm). Arc plasma can be applied to dissolve the dross and the experimental results of plasma arc harmless treatment are described.
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  • Recovery of strength of 7050 aluminum alloy with large amount impurities by RRA treatment
    Tadakazu OHNISHI, Harushige TSUBAKINO, Motohiro KANNO
    1996 Volume 46 Issue 11 Pages 597-601
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.597
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    One of the main problems in aluminum recycling is the removal of impurities unavoidably mixed from recycled materials. If harmfulness of impurities can be made harmless, an alloy with impurities could be used in the same manner as a high purity alloy. In this work, the recovery of strength of 7050 aluminum alloy with impurities by the RRA treatment was examined. When the solution heat treatment at a slightly higher temperature (500°C) than that of commercial condition is made and then the RRA treatment is applied, the alloy containing less than about 1% of impurities (Fe+Si) reveals the strength comparable to that of commercial purity alloy. The RRA treatment is useful for compensation of strength decreased with impurities.
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  • Reinforcement of 6063 aluminum alloy cutting chips by ball milling
    Koju TACHI, Kazuhiko KITA, Jun-ichi NAGAHORA, Yoshitaka NAGAI
    1996 Volume 46 Issue 11 Pages 602-606
    Published: 1996
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.46.602
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    In order to develope a recycled material with good mechanical properties, investigations about ball milling (BM) process to the 6063 aluminum alloy cutting chips from manufacturing process of architectural products were carried out. 6063 aluminum alloys are utilized for architectural products due to their good workability and corrosion resistance, and cutting chips of 6063 aluminum alloy from its manufacturing process are produced as much as hundreds tons per year. Application of BM process to 6063 aluminum alloy cutting chips causes grain refinement and improves its mechanical properties. With the progress of BM process, grain size of cutting chips reduced as fine as 200 nm, and its Vickers hardness became as high as 140 after 259.2 ks BM process. The extruded bar made of the cutting chips ball milled for 259.2 ks showed as high as 400 MPa in tensile strength and 30% of elongation.
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TECHNICAL DATA
RESEARCH NOTE
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