Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
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Volume 61, Issue 9
Displaying 1-9 of 9 articles from this issue
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RESEARCH REPORT
  • Deformation characteristic of asymmetric channel sections on draw bending process with restriction dies preventing undesirable deformation
    Yusuke Okude, Shuji Sakaki, Shoichiro Yoshihara
    Article type: Research Report
    2011 Volume 61 Issue 9 Pages 435-439
    Published: September 30, 2011
    Released on J-STAGE: October 30, 2011
    DOIhttps://doi.org/10.2464/jilm.61.435
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    Light gauge aluminum alloy extruded sections are advantageous for reducing the weight of any types of structure. A dissymmetrical channel section is a major example. In general, a secondary forming process such as bending is required for actual applications of these materials. However the bending of channel sections causes several types of undesirable deformation such as flattening wrinkling and torsion. There are two methods for preventing undesirable deformation. One is usage of restriction dies, and the other is application of an axial tension. In this study, the draw bending was focused, because application of restriction dies is easy and loading of axial tension is available. As the restriction dies, a laminated mandrel, a wiper die, and plates for preventing torsion were proposed. Finite Element Analysis (FEA) of draw bending was demonstrated to clarify effect of restriction die and axial tension. First, the draw bending was simulated to confirm the effect of the material properties. Next, in order to confirm the effect of the restriction dies and the axial tension against the undesirable deformation, the draw bending was simulated circumstantially. From these results, the effect of the restriction dies and the axial tension was described.
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  • Influence of SPS sintering condition on properties of aluminum-based composite materials exhibiting magnetism
    Sho Aoki, Yui Watanabe, Masahiro Kubota
    Article type: Research Report
    2011 Volume 61 Issue 9 Pages 440-445
    Published: September 30, 2011
    Released on J-STAGE: October 30, 2011
    DOIhttps://doi.org/10.2464/jilm.61.440
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    In order to investigate the effect of sintering temperatures and applied pressures on hardness and magnetic properties of the aluminum-based composite bulk materials possessing magnetic properties, composite powders were consolidated into the bulk materials at different sintering temperatures and applied pressures by spark plasma sintering (SPS). Solid-state reaction, hardness and magnetic properties of the composite bulk materials were characterised by X-ray diffraction, Vickers hardness and vibrating sample magnetometer, respectively. Change in constituent phases of the composite bulk materials fabricated at different sintering temperatures and applied pressures were observed. In addition, change in the amount of the intermetallic compounds of the composite bulk materials fabricated at different applied pressures was observed. The Vickers hardness of the composite bulk materials fabricated at 88 MPa was higher than that at 49 MPa due to the large amount of the Al13Fe4 and higher relative density. The magnetization of the composite bulk materials fabricated at 723 K and 773 K was corresponded to the amount of ZnO. In addition, the magnetization of the composite bulk materials fabricated at 823 K was dramatically decreased due to the formation of Al13Fe4. Effect of sintering temperatures and applied pressures on hardness and magnetic properties of the composite bulk materials was identified due to the change in the amount of the intermetallic compounds and relative density.
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  • Comparison of mechanical characteristics between semi-liquid state and semi-solid state in Al–Mg alloys
    Atsushi Zama, Kazuhiro Toshimitsu, Tomoya Watanabe, Hiroyuki Chiba, Ta ...
    Article type: Research Report
    2011 Volume 61 Issue 9 Pages 446-451
    Published: September 30, 2011
    Released on J-STAGE: October 30, 2011
    DOIhttps://doi.org/10.2464/jilm.61.446
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    In our previous works, tensile test devices for both semi-liquid and semi-solid aluminum alloys were developed. In this report, comparison of mechanical properties such as ultimate tensile strength (UTS) and fracture strain between semi-liquid and semi-solid Al–Mg alloy was examined. Difference of the mechanical properties will be caused by the microstructural change during heating process in the tensile test of semi-liquid alloy. By constant load creep test to the semi-liquid alloy, about 90% deformation of permanent and 10% of elastic deformation were found. Thus, in the thermal-stress analysis, solid–liquid co-existence aluminum alloy should be dealt as visco–elastic or viscoelasto–plastic material rather than elasto-plastic material.
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  • Strength of rapidly solidified Al–Zn–Mg alloys imposed high-velocity impact compression
    Keitaro Horikawa, Sota Omiya, Hidetoshi Kobayashi
    Article type: Research Report
    2011 Volume 61 Issue 9 Pages 452-457
    Published: September 30, 2011
    Released on J-STAGE: October 30, 2011
    DOIhttps://doi.org/10.2464/jilm.61.452
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    Effect of impact compression on the age-hardening behavior and the mechanical properties of Mesoalite (Meso10 and Meso20) aluminum alloy was examined by means of the high-velocity plane collision between a projectile and Mesoalite by using a single powder gun. By imposing the impact compression (5 GPa) to the Meso10 and Meso20 alloys in the state of quenching after the solution heat treatment, the following age-hardening at 110°C was highly accelerated. In the impact compression (5.7 GPa) against the peak-aged Mesoalite specimens, hardness was also increased, comparing with the Mesoalite without the impact compression. XRD revealed that high strain was introduced on the specimen inside after the impact compression. Compression test results revealed that both Meso10 and Meso20 specimens imposed the impact compressive stresses more than 5 GPa after the peak-aging at 110°C showed higher compressive yield stresses, comparing with the peak-aged specimens without the impact compression. It was also shown that Meso10 and Meso20 specimens after the solution treatment, followed by the high-velocity impact compression (12 GPa) and the peak-aging treatment indicated the highest compressive yield stresses, such as 994 MPa in Meso10 and 1091 MPa in Meso20, respectively.
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  • Kinetics of hydrogen desorption from rapidly solidified Al–Cr alloys
    Iya I. Tashlykova-Bushkevic, Goroh Itoh, Vasiliy G. Shepelevich, Takah ...
    Article type: Research Report
    2011 Volume 61 Issue 9 Pages 458-462
    Published: September 30, 2011
    Released on J-STAGE: October 30, 2011
    DOIhttps://doi.org/10.2464/jilm.61.458
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    The thermal desorption spectroscopy has been applied to analyze hydrogen desorption from foils of Al–Cr alloys containing up to 3.0 mol%Cr produced by centrifugal melt quenching. Surface morphology of the alloys was monitored using atomic force microscopy and scanning electron microscopy. It was revealed that hydrogen behavior is strongly affected by microstructural features available due to rapid solidification and represents at least four hydrogen trap sites in Al–Cr alloys. The interstitial lattice sites adjacent to solute Cr atoms are identified as predominant trap site. The occupancy of dislocations was estimated to be rather high in contrast to vacancies and pores in alloys. The amount of hydrogen trapped by vacancies is drastically decreased with increase in Cr concentration. These hydrogen/microstructure interactions were discussed regarding rapidly solidified pure aluminum as well as traditionally processed aluminum samples.
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  • Microstructure and joint strength of friction stir spot welded 6022 aluminum alloy sheets and plated steel sheets
    Keyan Feng, Mitsuhiro Watanabe, Shinji Kumai
    Article type: Research Report
    2011 Volume 61 Issue 9 Pages 463-468
    Published: September 30, 2011
    Released on J-STAGE: October 30, 2011
    DOIhttps://doi.org/10.2464/jilm.61.463
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    Friction stir spot welding (FSSW) was performed for joining of an aluminum alloy sheet to a steel sheet. A 6022 aluminum alloy sheet, a non-plated steel and four kinds of plated steel sheets were prepared. They were plated by pure zinc (GI), zinc alloy (ZAM), Al–Si alloy (AS) and zinc alloy including Fe (GA). The melting temperature of each plated layer was 420, 330, 640 and 880°C. The aluminum alloy sheet was overlapped on the steel sheet. A rotating tool was inserted from the aluminum alloy sheet side and the probe tip was kept at the position of 0.2 mm above the lapped interface for 3 s. Temperature change at the welding interface was measured during FSSW by using thermocouples which were located at the joint interface below the rotating tool. The maximum operating temperature was 430°C. It was found that interface morphology, strength and joining area of the joint varied depending on whether melting temperature of the plate layer was higher or lower than the maximum operating temperature. Large joint strength and joining area were obtained for the steel sheet with the low melting temperature of plated layer. In this case, the original plated layer was removed from the interface during FSSW and aluminum/steel interface with a thin intermediate layer was observed.
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