Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 48, Issue 2
Displaying 1-8 of 8 articles from this issue
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RESEARCH REPORT
  • Effects of manganese and zirconium on microstructures and mechanical properties of 6061 aluminum alloys
    Takeshi OHNO, Kyouichi MIYAZAWA, Shigeharu KAMADO, Yo KOJIMA, Ryuhei M ...
    1998 Volume 48 Issue 2 Pages 67-72
    Published: 1998
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.48.67
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    The addition of manganese and zirconium is effective to remove iron from the melt of the recycled aluminum. In such a case, manganese and zirconium possibly remain in the melt. The influence of the remaining elements on various properties of aluminum alloys has not been clarified. In this study, effects of the remaining manganese and zirconium on the microstructures and mechanical properties of the 6061 aluminum alloy were investigated. The compound of Al8(Cr, Mn, Fe)2Si crystallizes if manganese is added to the 6061 aluminum alloy, resulting in the reduced solid solubility of silicon in the matrix. Since silicon contributes to age hardening of the 6061 aluminum alloy by forming metastable phases with magnesium the addition of manganese thus causes the decreases in the 0.2% proof stress and tensile strength of the 6061 alloy. Zirconium added to the 6061 aluminum alloy is partly retained as a solid solution in the matrix and the remainder forms Al–Zr or Al–Zr–Si compounds. The amounts of these compounds, however, are very small, and their effects on the tensile properties are negligible. The manganese content in the 6061 aluminum alloy with 0.3%Zr should be less than 0.4mass% to guarantee the tensile properties specified in JIS.
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  • Effect of vibration characteristic and lubricant viscosity on deep drawing process with hydraulic counter pressure and vibration to tool system
    Seiji KATAOKA
    1998 Volume 48 Issue 2 Pages 73-77
    Published: 1998
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.48.73
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    A new experimental apparatus is constructed in order to improve the lubrication condition in the deep drawing of A5052P–O aluminum alloy sheets with thickness of 0.6 mm. A punch is oscillated in a longitudinal mode by mechanical vibration with frequency of 5 to 80 Hz. A die surface is also oscillated in a longitudinal mode by ultrasonic vibration with frequency of 21 kHz. The hydraulic counter pressure of 1.5 MPa is applied throughout the drawing process. The suitable application of the vibration can make remarkable increase of the limiting drawing ratio (L.D.R.) up to 2.05 and reduction of the maximum punch load in spite of the use of a poor lubricity paraffin oil with viscocity 2 cSt at 40°C.
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  • Deep drawing process of aluminum alloy sheet with hydraulic counter pressure and vibration to tool system with use of volatile lubricants
    Seiji KATAOKA
    1998 Volume 48 Issue 2 Pages 78-82
    Published: 1998
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.48.78
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    A new deep drawing process with hydraulic counter pressure and vibration to tool system was applied to deep drawing of aluminum alloy sheet (A5052P–O) in order to improve the poor lubricity of volatile lubricants. To compare the drawability with that of A5052P–O sheet, the mild steel sheet (SPCC) was also examined. Four volatile lubricants, 6211, 6215F, 6221F, 6280 were tested. In case of lubrication with 6221F and 6280, the application of the new deep drawing process can make a remarkable increase in the limiting drawing ratio (L.D.R.) of A5052P–O up to about 2.1 and a remarkable reduction of the maximum punch load. In case of 6211 and 6215F, the application of the new deep drawing process can make an increase in the limiting drawing ratio up to about 2.0 in spite of very poor lubricity of the lubricants. The effect of the application of the new deep drawing process for SPCC was smaller than that of A5052P–O.
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  • Turning machinability of SiCp/A383 aluminum alloy composite
    Kazuyoshi KATOH, Hiroshi TOKISUE, Toshio INOUE
    1998 Volume 48 Issue 2 Pages 83-87
    Published: 1998
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.48.83
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    Turning machinability test were performed on the SiCp/A383 aluminum alloy composite by measuring tool wear, cutting resistance and surface roughness. Shapes of flank wear were changed from band type to triangle type with increase of flank wear. The flank wear were increased with increasing of both cutting speed and cutting distance. The flank wear of the first stage of cutting was very large regardless cutting conditions. It was more than 0.2 mm on cutting distance of 50 mm. Regardless side rake angle, cutting resistance were increased with increasing of both cutting speed and cutting distance. In case of cutting speed on 1.67 m/s, finished surface roughness in the first stage of cutting was large, but finished surface roughness was changed for better with increasing of cutting distance. In case of start of cutting on cutting speed of more than 3.33 m/s, the finished surface roughness become better increased with increase of cutting distance. However finished surface roughness suddenly increased with increase of tool wear.
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  • Detection of damage in SiC fiber reinforced aluminum composites with optical fiber embedded method
    Hao DU, Hiroshi ASANUMA
    1998 Volume 48 Issue 2 Pages 88-92
    Published: 1998
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.48.88
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    This paper describes the monitoring method of reinforcement fiber fracture in a SiC fiber reinforced aluminum composite using optical fiber. The optical fiber embedded composites were produced by the interphase forming/bonding method with copper insert. During the tensile test of the composites, the optical transmission loss of the optical fiber was measured. The results show that breakage of the optical fiber starts at smaller strain than that of SiC fiber. Even after severe breakage of the optical fiber, it works as an optical path. Optical transmission loss is strongly dependent on the number of optical fiber breakage and also dependent on the gap ofbroken fiber. As breakage of SiC fiber strongly enhances that of optical fiber and is reflected on optical transmission loss, breakage of SiC fiber can be detected by monitoring of optical transmission loss. It can also reflect the type of fracture process of SiC fiber in the composite, that is, cumulative or concentrative.
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  • Macroscopic segregation in Al–11 mass%Si alloy containing 2 mass%Fe solidified under centrifugal force
    Hiromi MATSUBARA, Norihisa IZAWA, Masaru NAKANISHI
    1998 Volume 48 Issue 2 Pages 93-97
    Published: 1998
    Released on J-STAGE: March 30, 2007
    DOIhttps://doi.org/10.2464/jilm.48.93
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    In order to reduce iron content in aluminum alloys, a technique has been tried to segregate and separate intermetallic compounds containing iron by applying centrifugal force during solidification. The castings solidified under centrifugal force have shown obvious macroscopic segregation. The iron content decreases in the inner part of cast ingot from 2.07 mass% to 0.27 mass% due to the centrifugal force and the reduction ratio of iron has reached 87%. Thus, the utilization of this segregation phenomenon is a possible way of removal of the iron in aluminum alloys.
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  • Age hardening and fatigue strength of Al–Zn alloys with high Zn concentration
    Akira SAKAKIBARA, Teruto KANADANI, Norio HOSOKAWA, Tadashi TANIMOTO
    1998 Volume 48 Issue 2 Pages 98-102
    Published: 1998
    Released on J-STAGE: June 01, 2007
    DOIhttps://doi.org/10.2464/jilm.48.98
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    Soft surface layer formed after low temperature aging was studied on Al–12, 16, 18 and 20 mass%Zn alloy by means of hardness test and resistometry. The soft surface layer could not be observed in 20%Zn alloy aged at 273 K when the quenching temperature was higher than 673 K. The thickness of the soft surface layer in the specimen aged at 273 K after quenching from 673 K decreased with increase of Zn concentration. Aging curve in resistivity showed the depression of the growth of GP zones in the surface layer relative to the interior of the specimen. Fatigue strength in the repeated tensile mode was higher when the soft surface layer formed during aging was thicker. The soft surface layer formed by partial reversion treatment also increased fatigue strength.
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