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Volume 34, Issue 1
Displaying 1-9 of 9 articles from this issue
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Ichiro NAKAYAMA1984 Volume 34 Issue 1 Pages 1
Published: January 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (648K) -
Takehiko MAE, Shigenori HORI1984 Volume 34 Issue 1 Pages 3-7
Published: January 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe embrittlement of aluminum by liquid gallium was investigated by measurements of a tensile test, a microscope and EPMA methods. The fracture stress of aluminum, coated with gallium of less than 1 mg, or tested within 1 min after coating, varied widely. The fracture stress of aluminum decreased with increase in holding time after coating with gallium. The fracture stress of specimen removed gallium on surface was greater than that with gallium adhered to surface. The fracture stress of aluminum increased with increase in holding time at 35°C again, when gallium on its surface was removed after holding at 35°C for 300 min after coating. Ductile to brittle transition appeared within a range of temperature between 23°C and 27°C°Cunder the test in l min after coated with gallium. This temperature range was almost independent of strain rate. In the tensile test after holding at 35°C for long time, ductile to brittle transition was within the range of temperature between 0°C and 27°C.View full abstractDownload PDF (876K) -
Hidetoshi Kobayashi, Shiro Sato, Takashi Endo1984 Volume 34 Issue 1 Pages 8-13
Published: January 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSVickers hardness tests were carried out for various aluminum alloys under the condition that the duration of loading was changed. To determine the relation between hardness and creep properties, creep tests were carried out at room-temperature.
Hardness values of 1000 and 3000 series alloys lower with increase of the duration of loading and the effects of duration on strongly work-hardening materials are more considerable. However, hardness values of the other alloys are not influenced by the duration. Room-temperature creep is observed only in 1000 and 3000 series alloys. The creep limit σc of annealed material is larger than its proof stress σ0.2, but σc of work-hardening material is smaller than σ0.2. A linear relationship is found between the change of hardness with the duration of loading and the creep Property σc/σ0.2 of work-hardening alloys.View full abstractDownload PDF (768K) -
Yuzo TAKATSUJI, Shigeo ZAIMA, Biing Hwa YAN, Shigeru YAMADA1984 Volume 34 Issue 1 Pages 14-21
Published: January 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSThe dry cutting of Al-Si chill cast alloys (F and T6-materials of AC2B, AC4A, AC4B, and AC8A) were performed by using the CBN and diamond sintered tools, and semi continuous cast alloy of AC4B which had fine structure were cut in dry with the SKH4, K10, CBN and diamond sintered tool. And so, aspects of cut surface with these tools were examined with EPMA and profilometer.
In cutting with diamond sintered tool, cut surface roughness of the chill cast alloys containing large hard particles were better than CBN sintered tool in any cutting speed. But there was of no advantage to diamond sintered tool in cutting semi continuous cast alloy (AC4B) containing small hard particles.
In cutting 7075-T6 alloy which was used to compare with Al-Si cast alloys, cut surface roughness with diamond sintered tool was the best of all used tools, because front cutting edge geometry of this tool was transfer on cut surface.View full abstractDownload PDF (3382K) -
Osamu KONNO, Shin-ichiro FUJIKAWA, Kazuyoshi MASUMOTO, Masuo YAGI1984 Volume 34 Issue 1 Pages 22-33
Published: January 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSIn order to search the usefulness of aluminum alloys as a material for an accelerator and its surrounding apparatus, the characteristics of radioactivities induced in several aluminum alloys (AA 1230, AA 2219, JIS 5052, AA 6063 and AA 7079) and stainless steel (SUS 304) irradiated for a long time with high energy bremsstrahlung have been studied fundamentally and compared with each other. After the concentrations of major alloying elements and impurities in the above samples were determined by means of photon-activation, proton-activation and emission spectrochemical analyses, they were irradiated with 30 and 200 MeV bremsstrahlung. As the results, it was proved that the intensities of radioactivities induced in the aluminum alloys are greatly affected by those major and minor components, but are remarkably lower than that in the stainless steel.View full abstractDownload PDF (1513K) -
Shigeo ZAIMA, Rissaku MINAMI, Shigeru YAMADA, Hideyuki MIZUTANI, Masah ...1984 Volume 34 Issue 1 Pages 34-40
Published: January 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSIn this study, it was examined that the machinability of Al-4Cu-2Ni alloy (AC5A) in turning, Ni content in the alloys was changed to three varieties within the limits of JIS (Al-1.7% to 2.3%Ni). To avoid the effects by the contents of Si and Fe in the work materials on the machinability, they were kept 0.06%Si and 0.14%Fe. Result obtained are as follows:
Cutting force was not changed by difference of Ni content in the alloys which were used in this tests and its grade was similar to the case of 7075-T6 cutting. Moreover the various tool materials made no great difference in the cutting. In the low-speed and lowfeed cutting, cutting temperature was in the range of 450K to 500K, in the high speed cutting, however, the temperature approximately 700K regardless of the feed. It was found that the differences of tool wear aspects depend on various tool materials, namely the tool wears of SKH4 and SKH57 were relatively small, and K10 tool wear was still smaller. Also, in the low-speed cutting, built-up edge grew actively and cut surfaces were inferior, but in the high-speed cutting, the built-up edge disappeared and the cut surfaces became satisfactory. In general, chip disposal was found rather easy.View full abstractDownload PDF (1383K) -
Osami SERI, Noboru MASUKO1984 Volume 34 Issue 1 Pages 41-48
Published: January 31, 1984
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSSpecimens of pure aluminum and 4 different Al-Fe alloys of varing iron content ranging from 0.32% to 1.45% were immersed in aerated 0.1 M NaCl solutions for periods up to more than 1000 h. Long-term behavior of corrosion potentials of the specimens were observed and analysed with divisions into three stages. The corrosion processes taking place in each stage are illustrated in terms of the polarization curves on the individual single phases of pure aluminum, intermetallic compounds, and iron redispersed around corrosion pits. Scanning electron micrographs of the corroded specimens at each stage support the illustrations as follows. At the first stage, the cathodic reduction of disolved oxygen on the surface of intermetallic compounds is responsible for the progress of corrosion. At the second stage, the cathodic reduction of oxygen is retarded by corrosion products of aluminum hydroxide attached on to the surface of the cathodes. And at the third stage, corrosion proceeds in the pits beneath the corrosion products with the cathodic reduction of water under the corrosion potential of a few hundreds millivolts less than that of the first stage.View full abstractDownload PDF (2038K) -
Committce Of Chemical Analysis-Second Sub-Committc1984 Volume 34 Issue 1 Pages 49-56
Published: January 31, 1984
Released on J-STAGE: November 05, 2008
JOURNAL FREE ACCESSDownload PDF (838K) -
Masahisa OTSUKA1984 Volume 34 Issue 1 Pages 57-65
Published: January 31, 1984
Released on J-STAGE: July 23, 2008
JOURNAL FREE ACCESSDownload PDF (1660K)
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