Journal of Japan Institute of Light Metals
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
Volume 10, Issue 6
Displaying 1-8 of 8 articles from this issue
  • Masayuki KAWASAKI
    1960 Volume 10 Issue 6 Pages 371-372
    Published: 1960
    Released on J-STAGE: September 04, 2009
    JOURNAL FREE ACCESS
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  • Takashi IKENO, Shigeo ZAIMA, Kizo SHIBATA
    1960 Volume 10 Issue 6 Pages 373-377
    Published: 1960
    Released on J-STAGE: September 04, 2009
    JOURNAL FREE ACCESS
    When the study on the earing in the process of deep-drawing is made, the blank is oftenly taken from the sheets which are rolled in the early stage of the operation of rolling, when the temperature of roll as well as the other parts of machine is as almost same as the room temperature. But, after the rolling operation gets into stationary state in contenuons work, the temperature of the roll gets naturally higher. If so, the earing phenomenon may also be different between the blanks taken in early stage and stationary stages of rolling operation.
    This is to report on the result of the experiment to compare these two. It is found out that the difference as stated above, is recogniged as the cold reduction is increased. It is, therefore, considered that this fact should be taken into consideration when the specimen is taken for examining the earing phenomenon in deep-drawing operation.
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  • Trans mission laue method
    Shiro KOHARA
    1960 Volume 10 Issue 6 Pages 378-385
    Published: 1960
    Released on J-STAGE: September 04, 2009
    JOURNAL FREE ACCESS
    In the previous report, it was concluded that the X-ray diffraction method was most reliable for determining the orientations of single crystals of aluminium, In the present paper, a simplification of analysis of the transmission Laue photograph was studied to make the determination of orientations easy. The photograph was taken in this methed with lower voltage than in conventional way to get only severa main spots of (100), (110), (111), (112), (113) and (133) on the film so that the determination of orientations could be made directly. Standerd patterns of (100), (110) and (111) Laue spots were obtained by taking the transmission Laue photographs of aluminium single crystal for various incident angles. From these standard patterns, the charts were preparaed for identifying the indices of those spots in Laue photographs. Thus, the orientation of crystal could be calculated from the spots indexed by the chart. This method is also applicable to the deter mination of orientations of other face-centered cubic metals.
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  • Takashi IKENO
    1960 Volume 10 Issue 6 Pages 386-393
    Published: 1960
    Released on J-STAGE: September 04, 2009
    JOURNAL FREE ACCESS
    To get the well-finished cold-rolled sheet without pickling process, the control of surface condition of hot-rolled stock is most important. This is to report on the study for finding out the factors necessary for keeping the surface of hot-rolled stock under favourable condition to control the quality thereof.
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  • Shigeo MUROMACHI, Tomoya MINEGISHI
    1960 Volume 10 Issue 6 Pages 394-396,393
    Published: 1960
    Released on J-STAGE: September 04, 2009
    JOURNAL FREE ACCESS
    Oxidation of Mg in molten Al-Mg alloys is prevented by the addition of 0.5-0.05% Ca. This effect is most remakable when the Mg content in the alloy is as high as 5-10%.
    As the melting is repeated, the effect gets reduced. But when the quantity of Ca added is appropriate, the effect is kept remained up to the third melting. Gas content of the alloy of this system is reduced by the addition of Ca. This effect is better than in the case of adding Be.
    As to the castablity, however, the addition of Ca is less effective than the addition of Be. But when the Mg content of this type alloy is about 10%, the effective of the addition of Ca is as same as that of the addition of Be.
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  • Takashi IKENO, Shigeo ZAIMA, Kizo SHIBATA
    1960 Volume 10 Issue 6 Pages 397-404
    Published: 1960
    Released on J-STAGE: September 04, 2009
    JOURNAL FREE ACCESS
    On a largc-sized aluminium slab of 500×830×180mm (about 200kg), the comparison test was made for properties of its upper part (from where the casting was started), middle part and lower part (when the casting was ended). There is some differnce between them from the view-points of micro structure as well as of macro structure, But Almost no difference is seen in such mechanical properties as tensile strength, elongation, hardness and shearing strength. The Knoop ratio is higher in the middle part though sliglhty.
    Even when the slab is colled-rolled in cross way or one way, no differnce appears in mechanical properties and also in softening curve between the three parts.
    When deep-drown, the caring in the part from upper part of the slab is slightly different from others under the cold-reduction of 70-80%, whilesuch difference is not seen when the reduction is raised to 92.9%
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  • Riei ICHIKAWA
    1960 Volume 10 Issue 6 Pages 405-412
    Published: 1960
    Released on J-STAGE: September 04, 2009
    JOURNAL FREE ACCESS
    Processes of solidification of Mg side of Mg-Zn-Zr, Mg-Ag-Zr and some other alloys were examined by microstructure, differential thermoanalysis and X-ray analysis.
    From the above-mentioned examination, the liquidus surface of Mg side of Mg-Zn-Zr, Mg-Ag-Zr, Mg-Ca-Zr and Mg-Al-Zr was found out. The range of primary solid solution of Mg corner of Mg-Zn-Zr system was also found out. The projectional diagram of Mg side of the alloys of Mg-Zn-Zr and Mg-Ag-Zr systemswere prepared.
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  • Kinichiro FUJITA
    1960 Volume 10 Issue 6 Pages 413-444
    Published: 1960
    Released on J-STAGE: September 04, 2009
    JOURNAL FREE ACCESS
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